merge from develop.

doc/async_executors.qbk

@@ -1,5 +1,5 @@
 [/
- / Copyright (c) 2014 Vicente J. Botet Escriba
+ / Copyright (c) 2014-2015 Vicente J. Botet Escriba
  /
  / Distributed under the Boost Software License, Version 1.0. (See accompanying
  / file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
@@ -174,7 +174,7 @@ This has several advantages:
 * The scheduled operations are available for all the executors via wrappers.
 * The template functions could accept any chrono `time_point` and `duration` respectively as we are not working with virtual functions.
 
-In order to manage with all the clocks, this library propose generic solution. `scheduler<Clock>` know how to manage with the `submit_at`/`submit_after` `Clock::time_point`/`Clock::duration` tasks. Note that the durations on different clocks differ.
+In order to manage with all the clocks, this library propose a generic solution. `scheduler<Clock>` know how to manage with the `submit_at`/`submit_after` `Clock::time_point`/`Clock::duration` tasks. Note that the durations on different clocks differ.
 
 [heading Not Handled Exceptions]
 As in N3785 and based on the same design decision than `std`/`boost::thread` if a user closure throws an exception, the executor must call the `std::terminate` function.
@@ -506,9 +506,6 @@ Executor abstract base class.
     public:
       typedef  boost::work work;
   
-      executor(executor const&) = delete;
-      executor& operator=(executor const&) = delete;
-
       executor(); 
       virtual ~executor() {};
   
@@ -573,9 +570,6 @@ Polymorphic adaptor of a model of Executor to an executor.
     public:
       typedef  executor::work work;
   
-      executor_adaptor(executor_adaptor const&) = delete;
-      executor_adaptor& operator=(executor_adaptor const&) = delete;
-  
       template <typename ...Args>
       executor_adaptor(Args&& ... args);
 
@@ -641,20 +635,24 @@ Polymorphic adaptor of a model of Executor to an executor.
 [/////////////////////////////////]
 [section:generic_executor_ref Class `generic_executor_ref`]
 
-Executor abstract base class.
+Type erased executor class.
 
   #include <boost/thread/generic_executor_ref.hpp>
   namespace boost {
     class generic_executor_ref
     {
     public:
-      generic_executor_ref(generic_executor_ref const&);
-      generic_executor_ref& operator=(generic_executor_ref const&);
 
       template <class Executor>
       generic_executor_ref(Executor& ex); 
-      generic_executor_ref() {};
+      generic_executor_ref() = delete;
+      generic_executor_ref(generic_executor_ref const&) = default;
+      generic_executor_ref(generic_executor_ref &&) = default;
+      generic_executor_ref& operator=(generic_executor_ref const&) = default;
+      generic_executor_ref& operator=(generic_executor_ref &&) = default;
   
+      executor& underlying_executor() noexcept;
+
       void close() = 0;
       bool closed() = 0;
   
@@ -669,6 +667,44 @@ Executor abstract base class.
 
 [endsect]
 
+
+[/////////////////////////////////]
+[section:generic_executor Class `generic_executor`]
+
+Type erased executor class.
+
+  #include <boost/thread/generic_executor.hpp>
+  namespace boost {
+    class generic_executor
+    {
+    public:
+
+      template <class Executor>
+      generic_executor(Executor& ex); 
+      generic_executor() = delete;
+
+      generic_executor(generic_executor const&) = default;
+      generic_executor(generic_executor &&) = default;
+      generic_executor& operator=(generic_executor const&) = default;
+      generic_executor& operator=(generic_executor &&) = default;
+  
+      executor& underlying_executor() noexcept;
+
+      void close() = 0;
+      bool closed() = 0;
+  
+      template <typename Closure>
+      void submit(Closure&& closure);
+  
+      virtual bool try_executing_one() = 0;
+      template <typename Pred>
+      bool reschedule_until(Pred const& pred);
+    };
+  }
+
+[endsect]
+
+
 [//////////////////////////////////////////////////////////]
 [section: scheduler Template Class `scheduler `]
 
@@ -683,10 +719,7 @@ Scheduler providing time related functions. Note that `scheduler` is not an Exec
     public:
       using work = boost::function<void()> ;
       using clock = Clock;
-
-      scheduler(scheduler const&) = delete;
-      scheduler& operator=(scheduler const&) = delete;
-  
+ 
       scheduler();
       ~scheduler();
  
@@ -733,7 +766,7 @@ Scheduler providing time related functions. Note that `scheduler` is not an Exec
 
 [[Effects:] [Destroys the scheduler.]]
 
-[[Synchronization:] [The completion of all the closures happen before the completion of the executor destructor.]]
+[[Synchronization:] [The completion of all the closures happen before the completion of the destructor.]]
 
 ]
 
@@ -1339,10 +1372,6 @@ A serial executor ensuring that there are no two work units that executes concur
     class serial_executor
     {
     public:
-      serial_executor(serial_executor const&) = delete;
-      serial_executor& operator=(serial_executor const&) = delete;
-  
-      template <class Executor>
       serial_executor(Executor& ex);
  
       Executor& underlying_executor() noexcept;
@@ -1393,7 +1422,7 @@ A serial executor ensuring that there are no two work units that executes concur
 [/////////////////////////////////////]
 [section:underlying_executor Function member `underlying_executor()`]
 
-      generic_executor_ref& underlying_executor() noexcept;
+      Executor& underlying_executor() noexcept;
 
 [variablelist
 
@@ -1418,13 +1447,10 @@ A serial executor ensuring that there are no two work units that executes concur
     class generic_serial_executor
     {
     public:
-      generic_serial_executor(generic_serial_executor const&) = delete;
-      generic_serial_executor& operator=(generic_serial_executor const&) = delete;
-  
       template <class Executor>
       generic_serial_executor(Executor& ex);
  
-      generic_executor_ref& underlying_executor() noexcept;
+      generic_executor& underlying_executor() noexcept;
 
       void close();
       bool closed();
@@ -1433,6 +1459,7 @@ A serial executor ensuring that there are no two work units that executes concur
       void submit(Closure&& closure);
   
       bool try_executing_one();
+
       template <typename Pred>
       bool reschedule_until(Pred const& pred);
 
@@ -1456,7 +1483,7 @@ A serial executor ensuring that there are no two work units that executes concur
 
 [endsect]
 [/////////////////////////////////////]
-[section:destructor Destructor `~serial_executor()`]
+[section:destructor Destructor `~generic_serial_executor()`]
 
       ~generic_serial_executor();
 
@@ -1468,6 +1495,80 @@ A serial executor ensuring that there are no two work units that executes concur
 
 ]
 
+[endsect]
+[/////////////////////////////////////]
+[section:underlying_executor Function member `underlying_executor()`]
+
+      generic_executor& underlying_executor() noexcept;
+
+[variablelist
+
+[[Return:] [The underlying executor instance. ]]
+
+]
+
+
+[endsect]
+
+[endsect]
+
+[//////////////////////////////////////////////////////////]
+[section:serial_executor_cont Template Class `serial_executor_cont`]
+
+A serial executor ensuring that there are no two work units that executes concurrently.
+
+  #include <boost/thread/serial_executor_cont.hpp>
+  namespace boost {
+    template <class Executor>
+    class serial_executor_cont
+    {
+    public:
+      serial_executor_cont(Executor& ex);
+ 
+      Executor& underlying_executor() noexcept;
+
+      void close();
+      bool closed();
+  
+      template <typename Closure>
+      void submit(Closure&& closure);
+  
+      bool try_executing_one();
+      template <typename Pred>
+      bool reschedule_until(Pred const& pred);
+
+    };
+  }
+
+[/////////////////////////////////////]
+[section:constructor Constructor `serial_executor_cont(Executor&)`]
+
+      template <class Executor>
+      serial_executor_cont(Executor& ex);
+
+[variablelist
+
+[[Effects:] [Constructs a serial_executor_cont. ]]
+
+[[Throws:] [Nothing. ]]
+
+]
+
+
+[endsect]
+[/////////////////////////////////////]
+[section:destructor Destructor `~serial_executor_cont()`]
+
+      ~serial_executor_cont();
+
+[variablelist
+
+[[Effects:] [Destroys the serial_executor.]]
+
+[[Synchronization:] [The completion of all the closures happen before the completion of the executor destructor.]]
+
+]
+
 [endsect]
 [/////////////////////////////////////]
 [section:underlying_executor Function member `underlying_executor()`]
@@ -1478,6 +1579,8 @@ A serial executor ensuring that there are no two work units that executes concur
 
 [[Return:] [The underlying executor instance. ]]
 
+[[Throws:] [Nothing.]]
+
 ]
 
 
@@ -1485,6 +1588,82 @@ A serial executor ensuring that there are no two work units that executes concur
 
 [endsect]
 
+[//////////////////////////////////////////////////////////]
+[section:generic_serial_cont_executor Class `generic_serial_cont_executor`]
+
+A serial executor ensuring that there are no two work units that executes concurrently.
+
+  #include <boost/thread/generic_serial_cont_executor.hpp>
+  namespace boost {
+    class generic_serial_cont_executor
+    {
+    public:
+      template <class Executor>
+      generic_serial_cont_executor(Executor& ex);
+ 
+      generic_executor& underlying_executor() noexcept;
+
+      void close();
+      bool closed();
+  
+      template <typename Closure>
+      void submit(Closure&& closure);
+  
+      bool try_executing_one();
+
+      template <typename Pred>
+      bool reschedule_until(Pred const& pred);
+
+    };
+  }
+
+[/////////////////////////////////////]
+[section:constructor Constructor `generic_serial_cont_executor(Executor&)`]
+
+      template <class Executor>
+      generic_serial_cont_executor(Executor& ex);
+
+[variablelist
+
+[[Effects:] [Constructs a generic_serial_cont_executor. ]]
+
+[[Throws:] [Nothing. ]]
+
+]
+
+
+[endsect]
+[/////////////////////////////////////]
+[section:destructor Destructor `~generic_serial_cont_executor()`]
+
+      ~generic_serial_cont_executor();
+
+[variablelist
+
+[[Effects:] [Destroys the generic_serial_cont_executor.]]
+
+[[Synchronization:] [The completion of all the closures happen before the completion of the executor destructor.]]
+
+]
+
+[endsect]
+[/////////////////////////////////////]
+[section:underlying_executor Function member `underlying_executor()`]
+
+      generic_executor& underlying_executor() noexcept;
+
+[variablelist
+
+[[Return:] [The underlying executor instance. ]]
+
+]
+
+
+[endsect]
+
+[endsect]
+
+
 
 [//////////////////////////////////////////////////////////]
 [section:inline_executor Class `inline_executor`]
@@ -1496,10 +1675,8 @@ A serial executor ensuring that there are no two work units that executes concur
     class inline_executor
     {
     public:
-      inline_executor(inline_executor const&) = delete;
-      inline_executor& operator=(inline_executor const&) = delete;
-  
       inline_executor();
+      ~inline_executor();
  
       void close();
       bool closed();
@@ -1560,9 +1737,6 @@ A thread pool with up to a fixed number of threads.
     class basic_thread_pool
     { 
     public:
- 
-      basic_thread_pool(basic_thread_pool const&) = delete;
-      basic_thread_pool& operator=(basic_thread_pool const&) = delete;
   
       basic_thread_pool(unsigned const thread_count = thread::hardware_concurrency());
       template <class AtThreadEntry>
@@ -1623,9 +1797,6 @@ A thread_executor with a threads for each task.
     { 
     public:
  
-      thread_executor(thread_executor const&) = delete;
-      thread_executor& operator=(thread_executor const&) = delete;
-  
       thread_executor();
       template <class AtThreadEntry>
       basic_thread_pool( unsigned const thread_count, AtThreadEntry at_thread_entry);
@@ -1680,9 +1851,6 @@ A user scheduled executor.
     class loop_executor
     { 
     public:
- 
-      loop_executor(loop_executor const&) = delete;
-      loop_executor& operator=(loop_executor const&) = delete;
   
       loop_executor();
       ~loop_executor();

example/executor.cpp

@@ -17,7 +17,7 @@
 #include <boost/thread/caller_context.hpp>
 #include <boost/thread/executors/basic_thread_pool.hpp>
 #include <boost/thread/executors/loop_executor.hpp>
-#include <boost/thread/executors/serial_executor.hpp>
+#include <boost/thread/executors/generic_serial_executor.hpp>
 #include <boost/thread/executors/inline_executor.hpp>
 #include <boost/thread/executors/thread_executor.hpp>
 #include <boost/thread/executors/executor.hpp>
@@ -71,7 +71,7 @@ void submit_some(boost::executor& tp)
 }
 
 
-void at_th_entry(boost::basic_thread_pool& )
+void at_th_entry(boost::basic_thread_pool )
 {
 
 }
@@ -82,6 +82,10 @@ int test_executor_adaptor()
   {
     try
     {
+      {
+        boost::basic_thread_pool e1;
+        boost::basic_thread_pool e2 = e1;
+      }
       {
         boost::executor_adaptor < boost::basic_thread_pool > ea(4);
         submit_some( ea);
@@ -104,25 +108,65 @@ int test_executor_adaptor()
         submit_some(ea);
       }
       // std::cout << BOOST_CONTEXTOF << std::endl;
+      {
+        boost::loop_executor e1;
+        boost::loop_executor e2 = e1;
+        boost::executor_adaptor < boost::loop_executor > ea2(e2);
+        submit_some( ea2);
+        ea2.underlying_executor().run_queued_closures();
+      }
       {
         boost::executor_adaptor < boost::loop_executor > ea2;
         submit_some( ea2);
         ea2.underlying_executor().run_queued_closures();
       }
-#if ! defined(BOOST_NO_CXX11_RVALUE_REFERENCES)
       // std::cout << BOOST_CONTEXTOF << std::endl;
       {
-        boost::executor_adaptor < boost::basic_thread_pool > ea1(4);
-        boost::executor_adaptor < boost::serial_executor > ea2(ea1);
+        boost::basic_thread_pool tp;
+        boost::generic_serial_executor e1(tp);
+        boost::generic_serial_executor e2 = e1;
+      }
+      {
+        boost::basic_thread_pool ea1(4);
+        boost::generic_serial_executor ea2(ea1);
+        boost::executor_adaptor < boost::generic_serial_executor > ea3(ea2);
+        submit_some(ea3);
+      }
+      {
+        boost::basic_thread_pool ea1(4);
+        boost::generic_serial_executor ea2(ea1);
+        boost::executor_adaptor < boost::generic_serial_executor > ea3(ea2);
+        submit_some(ea3);
+      }
+//#if ! defined(BOOST_NO_CXX11_VARIADIC_TEMPLATES)
+      {
+        boost::basic_thread_pool ea1(4);
+        boost::executor_adaptor < boost::generic_serial_executor > ea2(ea1);
         submit_some(ea2);
       }
-#endif
+//#endif
       // std::cout << BOOST_CONTEXTOF << std::endl;
+      {
+        boost::inline_executor e1;
+        boost::inline_executor e2 = e1;
+        boost::executor_adaptor < boost::inline_executor > ea2(e2);
+        submit_some(ea2);
+      }
       {
         boost::executor_adaptor < boost::inline_executor > ea1;
         submit_some(ea1);
       }
       // std::cout << BOOST_CONTEXTOF << std::endl;
+      {
+        boost::thread_executor e1;
+        boost::thread_executor e2 = e1;
+      }
+      {
+        boost::thread_executor e1;
+        boost::executor_adaptor < boost::generic_executor > ea2(e1);
+        submit_some(ea2);
+      }
+
       {
         boost::executor_adaptor < boost::thread_executor > ea1;
         submit_some(ea1);

example/generic_executor.cpp

@@ -0,0 +1,184 @@
+// Copyright (C) 2014 Vicente Botet
+//
+//  Distributed under the Boost Software License, Version 1.0. (See accompanying
+//  file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+
+#include <boost/config.hpp>
+#if ! defined  BOOST_NO_CXX11_DECLTYPE
+#define BOOST_RESULT_OF_USE_DECLTYPE
+#endif
+
+#define BOOST_THREAD_VERSION 4
+#define BOOST_THREAD_PROVIDES_EXECUTORS
+//#define BOOST_THREAD_USES_LOG
+#define BOOST_THREAD_USES_LOG_THREAD_ID
+#define BOOST_THREAD_QUEUE_DEPRECATE_OLD
+
+#include <boost/thread/caller_context.hpp>
+#include <boost/thread/executors/basic_thread_pool.hpp>
+#include <boost/thread/executors/loop_executor.hpp>
+#include <boost/thread/executors/generic_serial_executor.hpp>
+#include <boost/thread/executors/serial_executor.hpp>
+#include <boost/thread/executors/inline_executor.hpp>
+#include <boost/thread/executors/thread_executor.hpp>
+#include <boost/thread/executors/executor.hpp>
+#include <boost/thread/executors/executor_adaptor.hpp>
+#include <boost/thread/executors/generic_executor.hpp>
+#include <boost/thread/executor.hpp>
+#include <boost/thread/future.hpp>
+#include <boost/assert.hpp>
+#include <string>
+#include <iostream>
+
+void p1()
+{
+  // std::cout << BOOST_CONTEXTOF << std::endl;
+  //boost::this_thread::sleep_for(boost::chrono::milliseconds(200));
+}
+
+void p2()
+{
+  // std::cout << BOOST_CONTEXTOF << std::endl;
+  //boost::this_thread::sleep_for(boost::chrono::seconds(10));
+}
+
+int f1()
+{
+  // std::cout << BOOST_CONTEXTOF << std::endl;
+  boost::this_thread::sleep_for(boost::chrono::seconds(1));
+  return 1;
+}
+int f2(int i)
+{
+  // std::cout << BOOST_CONTEXTOF << std::endl;
+  boost::this_thread::sleep_for(boost::chrono::seconds(2));
+  return i + 1;
+}
+
+void submit_some(boost::generic_executor tp)
+{
+  for (int i = 0; i < 3; ++i) {
+    tp.submit(&p2);
+  }
+  for (int i = 0; i < 3; ++i) {
+    tp.submit(&p1);
+  }
+
+}
+
+template < class Executor>
+void submit_some2(Executor& tp)
+{
+  for (int i = 0; i < 3; ++i) {
+    tp.submit(&p2);
+  }
+  for (int i = 0; i < 3; ++i) {
+    tp.submit(&p1);
+  }
+
+}
+
+template <class Executor>
+void submit_some3(boost::serial_executor<Executor>& tp)
+{
+  for (int i = 0; i < 3; ++i) {
+    tp.submit(&p2);
+  }
+  for (int i = 0; i < 3; ++i) {
+    tp.submit(&p1);
+  }
+}
+
+void at_th_entry(boost::basic_thread_pool)
+{
+
+}
+
+
+
+int test_generic_executor()
+{
+  // std::cout << BOOST_CONTEXTOF << std::endl;
+  {
+    try
+    {
+      {
+        boost::basic_thread_pool ea(4);
+        submit_some( ea);
+        {
+          boost::future<int> t1 = boost::async(ea, &f1);
+          boost::future<int> t2 = boost::async(ea, &f1);
+          // std::cout << BOOST_CONTEXTOF << " t1= " << t1.get() << std::endl;
+          // std::cout << BOOST_CONTEXTOF << " t2= " << t2.get() << std::endl;
+        }
+        submit_some(ea);
+        {
+          boost::basic_thread_pool ea3(1);
+          boost::future<int> t1 = boost::async(ea3, &f1);
+          boost::future<int> t2 = boost::async(ea3, &f1);
+          //boost::future<int> t2 = boost::async(ea3, f2, 1); // todo this doesn't compiles yet on C++11
+          //boost::future<int> t2 = boost::async(ea3, boost::bind(f2, 1)); // todo this doesn't compiles yet on C++98
+          // std::cout << BOOST_CONTEXTOF << " t1= " << t1.get() << std::endl;
+          // std::cout << BOOST_CONTEXTOF << " t2= " << t2.get() << std::endl;
+        }
+        submit_some(ea);
+      }
+      // std::cout << BOOST_CONTEXTOF << std::endl;
+      {
+        boost::loop_executor ea2;
+        submit_some( ea2);
+        ea2.run_queued_closures();
+      }
+#if ! defined(BOOST_NO_CXX11_RVALUE_REFERENCES)
+//      // std::cout << BOOST_CONTEXTOF << std::endl;
+//      {
+//        boost::basic_thread_pool ea1(4);
+//        boost::generic_serial_executor ea2(ea1);
+//        submit_some(ea2);
+//      }
+      // std::cout << BOOST_CONTEXTOF << std::endl;
+      {
+        boost::basic_thread_pool ea1(4);
+        boost::serial_executor<boost::basic_thread_pool> ea2(ea1);
+        submit_some3(ea2);
+      }
+#endif
+      // std::cout << BOOST_CONTEXTOF << std::endl;
+      {
+        boost::inline_executor ea1;
+        submit_some(ea1);
+      }
+      // std::cout << BOOST_CONTEXTOF << std::endl;
+      {
+        //boost::thread_executor ea1;
+        //submit_some(ea1);
+      }
+      // std::cout << BOOST_CONTEXTOF << std::endl;
+      {
+        boost::basic_thread_pool  ea(4, at_th_entry);
+        boost::future<int> t1 = boost::async(ea, &f1);
+        // std::cout << BOOST_CONTEXTOF << " t1= " << t1.get() << std::endl;
+      }
+    }
+    catch (std::exception& ex)
+    {
+      std::cout << "ERROR= " << ex.what() << "" << std::endl;
+      return 1;
+    }
+    catch (...)
+    {
+      std::cout << " ERROR= exception thrown" << std::endl;
+      return 2;
+    }
+  }
+  // std::cout << BOOST_CONTEXTOF << std::endl;
+  return 0;
+}
+
+
+int main()
+{
+  return test_generic_executor();
+
+
+}

example/generic_executor_ref.cpp

@@ -17,11 +17,12 @@
 #include <boost/thread/caller_context.hpp>
 #include <boost/thread/executors/basic_thread_pool.hpp>
 #include <boost/thread/executors/loop_executor.hpp>
-#include <boost/thread/executors/serial_executor.hpp>
+#include <boost/thread/executors/generic_serial_executor.hpp>
 #include <boost/thread/executors/inline_executor.hpp>
 #include <boost/thread/executors/thread_executor.hpp>
 #include <boost/thread/executors/executor.hpp>
 #include <boost/thread/executors/executor_adaptor.hpp>
+#include <boost/thread/executors/generic_executor_ref.hpp>
 #include <boost/thread/executor.hpp>
 #include <boost/thread/future.hpp>
 #include <boost/assert.hpp>
@@ -64,7 +65,7 @@ void submit_some(boost::generic_executor_ref tp)
 
 }
 
-void at_th_entry(boost::basic_thread_pool& )
+void at_th_entry(boost::basic_thread_pool)
 {
 
 }
@@ -108,7 +109,7 @@ int test_generic_executor_ref()
       // std::cout << BOOST_CONTEXTOF << std::endl;
       {
         boost::basic_thread_pool ea1(4);
-        boost::serial_executor ea2(ea1);
+        boost::generic_serial_executor ea2(ea1);
         submit_some(ea2);
       }
 #endif

example/generic_serial_executor.cpp

@@ -0,0 +1,117 @@
+// Copyright (C) 2015 Vicente J. Botet Escriba
+//
+//  Distributed under the Boost Software License, Version 1.0. (See accompanying
+//  file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+
+#include <boost/config.hpp>
+#if ! defined  BOOST_NO_CXX11_DECLTYPE
+#define BOOST_RESULT_OF_USE_DECLTYPE
+#endif
+
+#define BOOST_THREAD_VERSION 4
+#define BOOST_THREAD_PROVIDES_EXECUTORS
+//#define BOOST_THREAD_USES_LOG
+#define BOOST_THREAD_USES_LOG_THREAD_ID
+#define BOOST_THREAD_QUEUE_DEPRECATE_OLD
+
+#include <boost/thread/caller_context.hpp>
+#include <boost/thread/executors/basic_thread_pool.hpp>
+#include <boost/thread/executors/generic_serial_executor.hpp>
+#include <boost/thread/executors/executor.hpp>
+#include <boost/thread/executors/executor_adaptor.hpp>
+#include <boost/thread/executor.hpp>
+#include <boost/thread/future.hpp>
+#include <boost/assert.hpp>
+#include <string>
+#include <iostream>
+
+void p1()
+{
+  std::cout << BOOST_CONTEXTOF << std::endl;
+  boost::this_thread::sleep_for(boost::chrono::milliseconds(30));
+  std::cout << BOOST_CONTEXTOF << std::endl;
+}
+
+void p2()
+{
+  std::cout << BOOST_CONTEXTOF << std::endl;
+  boost::this_thread::sleep_for(boost::chrono::milliseconds(10));
+  std::cout << BOOST_CONTEXTOF << std::endl;
+}
+
+int f1()
+{
+  // std::cout << BOOST_CONTEXTOF << std::endl;
+  boost::this_thread::sleep_for(boost::chrono::seconds(1));
+  return 1;
+}
+int f2(int i)
+{
+  // std::cout << BOOST_CONTEXTOF << std::endl;
+  boost::this_thread::sleep_for(boost::chrono::seconds(2));
+  return i + 1;
+}
+
+void submit_some(boost::generic_serial_executor& tp)
+{
+  //std::cout << BOOST_CONTEXTOF << std::endl;
+  for (int i = 0; i < 3; ++i) {
+    //std::cout << BOOST_CONTEXTOF << std::endl;
+    tp.submit(&p2);
+  }
+  for (int i = 0; i < 3; ++i) {
+    //std::cout << BOOST_CONTEXTOF << std::endl;
+    tp.submit(&p1);
+  }
+  //std::cout << BOOST_CONTEXTOF << std::endl;
+}
+
+
+void at_th_entry(boost::basic_thread_pool )
+{
+
+}
+
+int test_executor_adaptor()
+{
+  std::cout << BOOST_CONTEXTOF << std::endl;
+  {
+     boost::basic_thread_pool tp;
+     boost::generic_serial_executor e1(tp);
+     boost::generic_serial_executor e2 = e1;
+  }
+  std::cout << BOOST_CONTEXTOF << std::endl;
+  {
+    try
+    {
+
+#if ! defined(BOOST_NO_CXX11_RVALUE_REFERENCES)
+      // std::cout << BOOST_CONTEXTOF << std::endl;
+      {
+        boost::basic_thread_pool ea1(4);
+        boost::generic_serial_executor ea2(ea1);
+        submit_some(ea2);
+      }
+#endif
+      // std::cout << BOOST_CONTEXTOF << std::endl;
+    }
+    catch (std::exception& ex)
+    {
+      std::cout << "ERROR= " << ex.what() << "" << std::endl;
+      return 1;
+    }
+    catch (...)
+    {
+      std::cout << " ERROR= exception thrown" << std::endl;
+      return 2;
+    }
+  }
+  // std::cout << BOOST_CONTEXTOF << std::endl;
+  return 0;
+}
+
+
+int main()
+{
+  return test_executor_adaptor();
+}

example/generic_serial_executor_cont.cpp

@@ -0,0 +1,118 @@
+// Copyright (C) 2015 Vicente J. Botet Escriba
+//
+//  Distributed under the Boost Software License, Version 1.0. (See accompanying
+//  file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+
+#include <boost/config.hpp>
+#if ! defined  BOOST_NO_CXX11_DECLTYPE
+#define BOOST_RESULT_OF_USE_DECLTYPE
+#endif
+
+#define BOOST_THREAD_VERSION 4
+#define BOOST_THREAD_PROVIDES_EXECUTORS
+//#define BOOST_THREAD_USES_LOG
+#define BOOST_THREAD_USES_LOG_THREAD_ID
+#define BOOST_THREAD_QUEUE_DEPRECATE_OLD
+
+#include <boost/thread/caller_context.hpp>
+#include <boost/thread/executors/basic_thread_pool.hpp>
+#include <boost/thread/executors/generic_serial_executor_cont.hpp>
+#include <boost/thread/executors/executor.hpp>
+#include <boost/thread/executors/executor_adaptor.hpp>
+#include <boost/thread/executor.hpp>
+#include <boost/thread/future.hpp>
+#include <boost/assert.hpp>
+#include <string>
+#include <iostream>
+
+void p1()
+{
+  std::cout << BOOST_CONTEXTOF << std::endl;
+  boost::this_thread::sleep_for(boost::chrono::milliseconds(30));
+  std::cout << BOOST_CONTEXTOF << std::endl;
+}
+
+void p2()
+{
+  std::cout << BOOST_CONTEXTOF << std::endl;
+  boost::this_thread::sleep_for(boost::chrono::milliseconds(10));
+  std::cout << BOOST_CONTEXTOF << std::endl;
+}
+
+int f1()
+{
+  // std::cout << BOOST_CONTEXTOF << std::endl;
+  boost::this_thread::sleep_for(boost::chrono::seconds(1));
+  return 1;
+}
+int f2(int i)
+{
+  // std::cout << BOOST_CONTEXTOF << std::endl;
+  boost::this_thread::sleep_for(boost::chrono::seconds(2));
+  return i + 1;
+}
+
+void submit_some(boost::generic_serial_executor_cont& tp)
+{
+  //std::cout << BOOST_CONTEXTOF << std::endl;
+  for (int i = 0; i < 3; ++i) {
+    //std::cout << BOOST_CONTEXTOF << std::endl;
+    tp.submit(&p2);
+  }
+  for (int i = 0; i < 3; ++i) {
+    //std::cout << BOOST_CONTEXTOF << std::endl;
+    tp.submit(&p1);
+  }
+  //std::cout << BOOST_CONTEXTOF << std::endl;
+
+}
+
+
+void at_th_entry(boost::basic_thread_pool)
+{
+
+}
+
+int test_executor_adaptor()
+{
+  std::cout << BOOST_CONTEXTOF << std::endl;
+  {
+     boost::basic_thread_pool tp;
+     boost::generic_serial_executor_cont e1(tp);
+     boost::generic_serial_executor_cont e2 = e1;
+  }
+  // std::cout << BOOST_CONTEXTOF << std::endl;
+  {
+    try
+    {
+
+#if ! defined(BOOST_NO_CXX11_RVALUE_REFERENCES)
+      // std::cout << BOOST_CONTEXTOF << std::endl;
+      {
+        boost::basic_thread_pool ea1(4);
+        boost::generic_serial_executor_cont ea2(ea1);
+        submit_some(ea2);
+      }
+#endif
+      // std::cout << BOOST_CONTEXTOF << std::endl;
+    }
+    catch (std::exception& ex)
+    {
+      std::cout << "ERROR= " << ex.what() << "" << std::endl;
+      return 1;
+    }
+    catch (...)
+    {
+      std::cout << " ERROR= exception thrown" << std::endl;
+      return 2;
+    }
+  }
+  // std::cout << BOOST_CONTEXTOF << std::endl;
+  return 0;
+}
+
+
+int main()
+{
+  return test_executor_adaptor();
+}

example/serial_executor.cpp

@@ -51,8 +51,8 @@ int f2(int i)
   boost::this_thread::sleep_for(boost::chrono::seconds(2));
   return i + 1;
 }
-
-void submit_some(boost::serial_executor& tp)
+template <class Executor>
+void submit_some(boost::serial_executor<Executor>& tp)
 {
   for (int i = 0; i < 3; ++i) {
     std::cout << BOOST_CONTEXTOF << std::endl;
@@ -80,9 +80,8 @@ int test_executor_adaptor()
 #if ! defined(BOOST_NO_CXX11_RVALUE_REFERENCES)
       {
         boost::basic_thread_pool ea1(4);
-        boost::serial_executor ea2(ea1);
+        boost::serial_executor<boost::basic_thread_pool> ea2(ea1);
         submit_some(ea2);
-        boost::this_thread::sleep_for(boost::chrono::seconds(10));
       }
 #endif
     }

example/serial_executor_cont.cpp

@@ -52,18 +52,19 @@ int f2(int i)
   return i + 1;
 }
 
-void submit_some(boost::serial_executor_cont& tp)
+template < class Executor>
+void submit_some(boost::serial_executor_cont<Executor>& tp)
 {
-  std::cout << BOOST_CONTEXTOF << std::endl;
+  //std::cout << BOOST_CONTEXTOF << std::endl;
   for (int i = 0; i < 3; ++i) {
-    std::cout << BOOST_CONTEXTOF << std::endl;
+    //std::cout << BOOST_CONTEXTOF << std::endl;
     tp.submit(&p2);
   }
   for (int i = 0; i < 3; ++i) {
-    std::cout << BOOST_CONTEXTOF << std::endl;
+    //std::cout << BOOST_CONTEXTOF << std::endl;
     tp.submit(&p1);
   }
-  std::cout << BOOST_CONTEXTOF << std::endl;
+  //std::cout << BOOST_CONTEXTOF << std::endl;
 
 }
 
@@ -84,9 +85,8 @@ int test_executor_adaptor()
       // std::cout << BOOST_CONTEXTOF << std::endl;
       {
         boost::basic_thread_pool ea1(4);
-        boost::serial_executor_cont ea2(ea1);
+        boost::serial_executor_cont<boost::basic_thread_pool> ea2(ea1);
         submit_some(ea2);
-        boost::this_thread::sleep_for(boost::chrono::seconds(10));
       }
 #endif
       // std::cout << BOOST_CONTEXTOF << std::endl;

include/boost/thread/executors/basic_thread_pool.hpp

@@ -1,4 +1,4 @@
-// Copyright (C) 2013-2014 Vicente J. Botet Escriba
+// Copyright (C) 2013-2015 Vicente J. Botet Escriba
 //
 //  Distributed under the Boost Software License, Version 1.0. (See accompanying
 //  file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
@@ -18,6 +18,11 @@
 #include <boost/thread/executors/work.hpp>
 #include <boost/thread/csbl/vector.hpp>
 
+#include <boost/smart_ptr/shared_ptr.hpp>
+#include <boost/smart_ptr/make_shared.hpp>
+#include <boost/smart_ptr/enable_shared_from_this.hpp>
+#include <boost/function.hpp>
+
 #include <boost/config/abi_prefix.hpp>
 
 namespace boost
@@ -30,124 +35,256 @@ namespace executors
     /// type-erasure to store the works to do
     typedef  executors::work work;
   private:
-    typedef thread thread_t;
-    /// A move aware vector type
-    typedef csbl::vector<thread_t> thread_vector;
 
-    /// A move aware vector
-    thread_vector threads;
-    /// the thread safe work queue
-    concurrent::sync_queue<work > work_queue;
+    struct shared_state : enable_shared_from_this<shared_state> {
+      typedef  executors::work work;
+      /// the kind of stored threads are scoped threads to ensure that the threads are joined.
+      /// A move aware vector type
+      //typedef scoped_thread<> thread_t;
+      typedef thread thread_t;
+      typedef csbl::vector<thread_t> thread_vector;
 
-  public:
-    /**
-     * Effects: try to execute one task.
-     * Returns: whether a task has been executed.
-     * Throws: whatever the current task constructor throws or the task() throws.
-     */
-    bool try_executing_one()
-    {
-      try
-      {
-        work task;
-        if (work_queue.try_pull(task) == queue_op_status::success)
-        {
-          task();
-          return true;
-        }
-        return false;
-      }
-      catch (...)
-      {
-        std::terminate();
-        return false;
-      }
-    }
-    /**
-     * Effects: schedule one task or yields
-     * Throws: whatever the current task constructor throws or the task() throws.
-     */
-    void schedule_one_or_yield()
-    {
-        if ( ! try_executing_one())
-        {
-          this_thread::yield();
-        }
-    }
-  private:
+      /// the thread safe work queue
+      concurrent::sync_queue<work > work_queue;
+      /// A move aware vector
+      thread_vector threads;
+      unsigned const thread_count;
+      boost::function<void(basic_thread_pool)> at_thread_entry;
+      friend class basic_thread_pool;
 
-    /**
-     * The main loop of the worker threads
-     */
-    void worker_thread()
-    {
-      try
+
+    public:
+      /**
+       * Effects: try to execute one task.
+       * Returns: whether a task has been executed.
+       * Throws: whatever the current task constructor throws or the task() throws.
+       */
+      bool try_executing_one()
       {
-        for(;;)
+        try
         {
           work task;
-          queue_op_status st = work_queue.wait_pull(task);
-          if (st == queue_op_status::closed) return;
-          task();
+          if (work_queue.try_pull(task) == queue_op_status::success)
+          {
+            task();
+            return true;
+          }
+          return false;
+        }
+        catch (...)
+        {
+          std::terminate();
+          return false;
         }
       }
-      catch (...)
+      /**
+       * Effects: schedule one task or yields
+       * Throws: whatever the current task constructor throws or the task() throws.
+       */
+      void schedule_one_or_yield()
       {
-        std::terminate();
-        return;
+          if ( ! try_executing_one())
+          {
+            this_thread::yield();
+          }
       }
-    }
-#if defined(BOOST_NO_CXX11_RVALUE_REFERENCES)
-    template <class AtThreadEntry>
-    void worker_thread1(AtThreadEntry& at_thread_entry)
-    {
-      at_thread_entry(*this);
-      worker_thread();
-    }
-#endif
-    void worker_thread2(void(*at_thread_entry)(basic_thread_pool&))
-    {
-      at_thread_entry(*this);
-      worker_thread();
-    }
-    template <class AtThreadEntry>
-    void worker_thread3(BOOST_THREAD_FWD_REF(AtThreadEntry) at_thread_entry)
-    {
-      at_thread_entry(*this);
-      worker_thread();
-    }
-    static void do_nothing_at_thread_entry(basic_thread_pool&) {}
+    private:
 
+      /**
+       * The main loop of the worker threads
+       */
+      void worker_thread()
+      {
+        // fixme: this call results on segmentation fault
+        //at_thread_entry(basic_thread_pool(this->shared_from_this()));
+        try
+        {
+          for(;;)
+          {
+            work task;
+            queue_op_status st = work_queue.wait_pull(task);
+            if (st == queue_op_status::closed) break;
+            task();
+          }
+        }
+        catch (...)
+        {
+          std::terminate();
+          return;
+        }
+      }
+
+      static void do_nothing_at_thread_entry(basic_thread_pool) {}
+
+      void init()
+      {
+        try
+        {
+          threads.reserve(thread_count);
+          for (unsigned i = 0; i < thread_count; ++i)
+          {
+            thread th (&shared_state::worker_thread, this);
+            threads.push_back(thread_t(boost::move(th)));
+          }
+        }
+        catch (...)
+        {
+          close();
+          throw;
+        }
+      }
+
+    public:
+      /// basic_thread_pool is not copyable.
+      BOOST_THREAD_NO_COPYABLE(shared_state)
+
+      /**
+       * \b Effects: creates a thread pool that runs closures on \c thread_count threads.
+       *
+       * \b Throws: Whatever exception is thrown while initializing the needed resources.
+       */
+      shared_state(unsigned const thread_count = thread::hardware_concurrency()+1)
+      : thread_count(thread_count),
+        at_thread_entry(do_nothing_at_thread_entry)
+      {
+      }
+      /**
+       * \b Effects: creates a thread pool that runs closures on \c thread_count threads
+       * and executes the at_thread_entry function at the entry of each created thread. .
+       *
+       * \b Throws: Whatever exception is thrown while initializing the needed resources.
+       */
+  #if defined(BOOST_NO_CXX11_RVALUE_REFERENCES)
+      template <class AtThreadEntry>
+      shared_state( unsigned const thread_count, AtThreadEntry& at_thread_entry)
+      : thread_count(thread_count),
+        at_thread_entry(at_thread_entry)
+      {
+      }
+  #endif
+      shared_state( unsigned const thread_count, void(*at_thread_entry)(basic_thread_pool))
+      : thread_count(thread_count),
+        at_thread_entry(at_thread_entry)
+      {
+      }
+      template <class AtThreadEntry>
+      shared_state( unsigned const thread_count, BOOST_THREAD_FWD_REF(AtThreadEntry) at_thread_entry)
+      : thread_count(thread_count),
+        at_thread_entry(boost::move(at_thread_entry))
+      {
+      }
+      /**
+       * \b Effects: Destroys the thread pool.
+       *
+       * \b Synchronization: The completion of all the closures happen before the completion of the \c basic_thread_pool destructor.
+       */
+      ~shared_state()
+      {
+        // signal to all the worker threads that there will be no more submissions.
+        close();
+        join();
+        // joins all the threads as the threads were scoped_threads
+      }
+
+      /**
+       * \b Effects: join all the threads.
+       */
+      void join()
+      {
+        for (unsigned i = 0; i < threads.size(); ++i)
+        {
+          if (this_thread::get_id() == threads[i].get_id()) continue;
+          threads[i].join();
+        }
+      }
+
+      /**
+       * \b Effects: close the \c basic_thread_pool for submissions.
+       * The worker threads will work until there is no more closures to run.
+       */
+      void close()
+      {
+        work_queue.close();
+      }
+
+      /**
+       * \b Returns: whether the pool is closed for submissions.
+       */
+      bool closed()
+      {
+        return work_queue.closed();
+      }
+
+      /**
+       * \b Requires: \c Closure is a model of \c Callable(void()) and a model of \c CopyConstructible/MoveConstructible.
+       *
+       * \b Effects: The specified \c closure will be scheduled for execution at some point in the future.
+       * If invoked closure throws an exception the \c basic_thread_pool will call \c std::terminate, as is the case with threads.
+       *
+       * \b Synchronization: completion of \c closure on a particular thread happens before destruction of thread's thread local variables.
+       *
+       * \b Throws: \c sync_queue_is_closed if the thread pool is closed.
+       * Whatever exception that can be throw while storing the closure.
+       */
+
+  #if defined(BOOST_NO_CXX11_RVALUE_REFERENCES)
+      template <typename Closure>
+      void submit(Closure & closure)
+      {
+        work_queue.push(work(closure));
+      }
+  #endif
+      void submit(void (*closure)())
+      {
+        work_queue.push(work(closure));
+      }
+
+      template <typename Closure>
+      void submit(BOOST_THREAD_RV_REF(Closure) closure)
+      {
+        work_queue.push(work(boost::forward<Closure>(closure)));
+      }
+
+      /**
+       * \b Requires: This must be called from an scheduled task.
+       *
+       * \b Effects: reschedule functions until pred()
+       */
+      template <typename Pred>
+      bool reschedule_until(Pred const& pred)
+      {
+        do {
+          if ( ! try_executing_one())
+          {
+            return false;
+          }
+        } while (! pred());
+        return true;
+      }
+    };
+
+    /**
+     * \b Effects: creates a thread pool with this shared state.
+     *
+     * \b Throws: Whatever exception is thrown while initializing the needed resources.
+     */
+    friend struct shared_state;
+    basic_thread_pool(shared_ptr<shared_state> ptr)
+    : pimpl(ptr)
+    {
+    }
   public:
-    /// basic_thread_pool is not copyable.
-    BOOST_THREAD_NO_COPYABLE(basic_thread_pool)
-
     /**
      * \b Effects: creates a thread pool that runs closures on \c thread_count threads.
      *
      * \b Throws: Whatever exception is thrown while initializing the needed resources.
      */
     basic_thread_pool(unsigned const thread_count = thread::hardware_concurrency()+1)
+    : pimpl(make_shared<shared_state>(thread_count))
     {
-      try
-      {
-        threads.reserve(thread_count);
-        for (unsigned i = 0; i < thread_count; ++i)
-        {
-#if 1
-          thread th (&basic_thread_pool::worker_thread, this);
-          threads.push_back(thread_t(boost::move(th)));
-#else
-          threads.push_back(thread_t(&basic_thread_pool::worker_thread, this)); // do not compile
-#endif
-        }
-      }
-      catch (...)
-      {
-        close();
-        throw;
-      }
+      pimpl->init();
     }
+
     /**
      * \b Effects: creates a thread pool that runs closures on \c thread_count threads
      * and executes the at_thread_entry function at the entry of each created thread. .
@@ -157,61 +294,24 @@ namespace executors
 #if defined(BOOST_NO_CXX11_RVALUE_REFERENCES)
     template <class AtThreadEntry>
     basic_thread_pool( unsigned const thread_count, AtThreadEntry& at_thread_entry)
+    : pimpl(make_shared<shared_state>(thread_count, at_thread_entry))
     {
-      try
-      {
-        threads.reserve(thread_count);
-        for (unsigned i = 0; i < thread_count; ++i)
-        {
-          thread th (&basic_thread_pool::worker_thread1<AtThreadEntry>, this, at_thread_entry);
-          threads.push_back(thread_t(boost::move(th)));
-          //threads.push_back(thread_t(&basic_thread_pool::worker_thread, this)); // do not compile
-        }
-      }
-      catch (...)
-      {
-        close();
-        throw;
-      }
+      pimpl->init();
     }
 #endif
-    basic_thread_pool( unsigned const thread_count, void(*at_thread_entry)(basic_thread_pool&))
+
+    basic_thread_pool( unsigned const thread_count, void(*at_thread_entry)(basic_thread_pool))
+    : pimpl(make_shared<shared_state>(thread_count, at_thread_entry))
     {
-      try
-      {
-        threads.reserve(thread_count);
-        for (unsigned i = 0; i < thread_count; ++i)
-        {
-          thread th (&basic_thread_pool::worker_thread2, this, at_thread_entry);
-          threads.push_back(thread_t(boost::move(th)));
-          //threads.push_back(thread_t(&basic_thread_pool::worker_thread, this)); // do not compile
-        }
-      }
-      catch (...)
-      {
-        close();
-        throw;
-      }
+      pimpl->init();
     }
     template <class AtThreadEntry>
     basic_thread_pool( unsigned const thread_count, BOOST_THREAD_FWD_REF(AtThreadEntry) at_thread_entry)
+    : pimpl(make_shared<shared_state>(thread_count, boost::forward<AtThreadEntry>(at_thread_entry)))
     {
-      try
-      {
-        threads.reserve(thread_count);
-        for (unsigned i = 0; i < thread_count; ++i)
-        {
-          thread th (&basic_thread_pool::worker_thread3<AtThreadEntry>, this, boost::forward<AtThreadEntry>(at_thread_entry));
-          threads.push_back(thread_t(boost::move(th)));
-          //threads.push_back(thread_t(&basic_thread_pool::worker_thread, this)); // do not compile
-        }
-      }
-      catch (...)
-      {
-        close();
-        throw;
-      }
+      pimpl->init();
     }
+
     /**
      * \b Effects: Destroys the thread pool.
      *
@@ -219,10 +319,16 @@ namespace executors
      */
     ~basic_thread_pool()
     {
-      // signal to all the worker threads that there will be no more submissions.
-      close();
-      // joins all the threads before destroying the thread pool resources (e.g. the queue).
-      join();
+    }
+
+    /**
+     * Effects: try to execute one task.
+     * Returns: whether a task has been executed.
+     * Throws: whatever the current task constructor throws or the task() throws.
+     */
+    bool try_executing_one()
+    {
+      return pimpl->try_executing_one();
     }
 
     /**
@@ -230,10 +336,7 @@ namespace executors
      */
     void join()
     {
-      for (unsigned i = 0; i < threads.size(); ++i)
-      {
-        threads[i].join();
-      }
+      pimpl->join();
     }
 
     /**
@@ -242,7 +345,7 @@ namespace executors
      */
     void close()
     {
-      work_queue.close();
+      pimpl->close();
     }
 
     /**
@@ -250,7 +353,7 @@ namespace executors
      */
     bool closed()
     {
-      return work_queue.closed();
+      return pimpl->closed();
     }
 
     /**
@@ -269,18 +372,18 @@ namespace executors
     template <typename Closure>
     void submit(Closure & closure)
     {
-      work_queue.push(work(closure));
+      pimpl->submit(closure);
     }
 #endif
     void submit(void (*closure)())
     {
-      work_queue.push(work(closure));
+      pimpl->submit(closure);
     }
 
     template <typename Closure>
     void submit(BOOST_THREAD_RV_REF(Closure) closure)
     {
-      work_queue.push(work(boost::forward<Closure>(closure)));
+      pimpl->submit(boost::forward<Closure>(closure));
     }
 
     /**
@@ -291,15 +394,16 @@ namespace executors
     template <typename Pred>
     bool reschedule_until(Pred const& pred)
     {
-      do {
-        if ( ! try_executing_one())
-        {
-          return false;
-        }
-      } while (! pred());
-      return true;
+      return pimpl->reschedule_until(pred);
     }
 
+    void schedule_one_or_yield()
+    {
+      return pimpl->schedule_one_or_yield();
+    }
+
+  private:
+    shared_ptr<shared_state> pimpl;
   };
 }
 using executors::basic_thread_pool;

include/boost/thread/executors/detail/priority_executor_base.hpp

@@ -24,7 +24,6 @@ namespace detail
   class priority_executor_base
   {
   public:
-    //typedef boost::function<void()> work;
     typedef executors::work_pq work;
   protected:
     typedef Queue queue_type;

include/boost/thread/executors/executor.hpp

@@ -1,4 +1,4 @@
-// Copyright (C) 2013,2014 Vicente J. Botet Escriba
+// Copyright (C) 2013,2015 Vicente J. Botet Escriba
 //
 //  Distributed under the Boost Software License, Version 1.0. (See accompanying
 //  file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
@@ -27,8 +27,6 @@ namespace boost
     /// type-erasure to store the works to do
     typedef  executors::work work;
 
-    /// executor is not copyable.
-    BOOST_THREAD_NO_COPYABLE(executor)
     executor() {}
 
     /**
@@ -128,7 +126,6 @@ namespace boost
     bool reschedule_until(Pred const& pred)
     {
       do {
-        //schedule_one_or_yield();
         if ( ! try_executing_one())
         {
           return false;

include/boost/thread/executors/executor_adaptor.hpp

@@ -1,4 +1,4 @@
-// Copyright (C) 2013,2014 Vicente J. Botet Escriba
+// Copyright (C) 2013,2015 Vicente J. Botet Escriba
 //
 //  Distributed under the Boost Software License, Version 1.0. (See accompanying
 //  file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
@@ -30,9 +30,8 @@ namespace executors
     /// type-erasure to store the works to do
     typedef  executor::work work;
 
-    /// executor is not copyable.
-    BOOST_THREAD_NO_COPYABLE(executor_adaptor)
-
+//    executor_adaptor(executor_adaptor const&) = default;
+//    executor_adaptor(executor_adaptor &&) = default;
     /**
      * executor_adaptor constructor
      */

include/boost/thread/executors/generic_executor.hpp

@@ -0,0 +1,150 @@
+// Copyright (C) 2015 Vicente J. Botet Escriba
+//
+//  Distributed under the Boost Software License, Version 1.0. (See accompanying
+//  file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+
+#ifndef BOOST_THREAD_EXECUTORS_GENERIC_EXECUTOR_HPP
+#define BOOST_THREAD_EXECUTORS_GENERIC_EXECUTOR_HPP
+
+#include <boost/thread/detail/config.hpp>
+
+#include <boost/thread/detail/delete.hpp>
+#include <boost/thread/detail/move.hpp>
+#include <boost/thread/executors/executor_adaptor.hpp>
+
+#include <boost/smart_ptr/shared_ptr.hpp>
+#include <boost/smart_ptr/make_shared.hpp>
+#include <boost/type_traits/decay.hpp>
+
+#include <boost/config/abi_prefix.hpp>
+
+namespace boost
+{
+  namespace executors
+  {
+
+  class generic_executor
+  {
+    shared_ptr<executor> ex;
+  public:
+    /// type-erasure to store the works to do
+    typedef executors::work work;
+
+    //generic_executor(generic_executor const&) = default;
+    //generic_executor(generic_executor &&) = default;
+
+    template<typename Executor>
+    generic_executor(Executor const& ex
+        , typename boost::disable_if<is_same<Executor, generic_executor>,
+          int* >::type =  (int*)0
+    )
+    //: ex(make_shared<executor_adaptor<Executor> >(ex)) // todo check why this doesn't work with C++03
+    : ex( new executor_adaptor<Executor>(ex) )
+    {
+    }
+
+    //generic_executor(generic_executor const& other) noexcept    {}
+    //generic_executor& operator=(generic_executor const& other) noexcept    {}
+
+
+    /**
+     * \par Effects
+     * Close the \c executor for submissions.
+     * The worker threads will work until there is no more closures to run.
+     */
+    void close() { ex->close(); }
+
+    /**
+     * \par Returns
+     * Whether the pool is closed for submissions.
+     */
+    bool closed() { return ex->closed(); }
+
+    void submit(BOOST_THREAD_RV_REF(work) closure)
+    {
+      ex->submit(boost::forward<work>(closure));
+    }
+
+    /**
+     * \par Requires
+     * \c Closure is a model of Callable(void()) and a model of CopyConstructible/MoveConstructible.
+     *
+     * \par Effects
+     * The specified closure will be scheduled for execution at some point in the future.
+     * If invoked closure throws an exception the thread pool will call std::terminate, as is the case with threads.
+     *
+     * \par Synchronization
+     * Completion of closure on a particular thread happens before destruction of thread's thread local variables.
+     *
+     * \par Throws
+     * \c sync_queue_is_closed if the thread pool is closed.
+     * Whatever exception that can be throw while storing the closure.
+     */
+
+#if defined(BOOST_NO_CXX11_RVALUE_REFERENCES)
+    template <typename Closure>
+    void submit(Closure & closure)
+    {
+      work w ((closure));
+      submit(boost::move(w));
+    }
+#endif
+    void submit(void (*closure)())
+    {
+      work w ((closure));
+      submit(boost::move(w));
+    }
+
+    template <typename Closure>
+    void submit(BOOST_THREAD_RV_REF(Closure) closure)
+    {
+      work w = boost::move(closure);
+      submit(boost::move(w));
+    }
+
+//    size_t num_pending_closures() const
+//    {
+//      return ex->num_pending_closures();
+//    }
+
+    /**
+     * \par Effects
+     * Try to execute one task.
+     *
+     * \par Returns
+     * Whether a task has been executed.
+     *
+     * \par Throws
+     * Whatever the current task constructor throws or the task() throws.
+     */
+    bool try_executing_one() { return ex->try_executing_one(); }
+
+    /**
+     * \par Requires
+     * This must be called from an scheduled task.
+     *
+     * \par Effects
+     * reschedule functions until pred()
+     */
+    template <typename Pred>
+    bool reschedule_until(Pred const& pred)
+    {
+      do {
+        //schedule_one_or_yield();
+        if ( ! try_executing_one())
+        {
+          return false;
+        }
+      } while (! pred());
+      return true;
+    }
+
+  };
+  }
+  using executors::generic_executor;
+}
+
+#include <boost/config/abi_suffix.hpp>
+
+#endif

include/boost/thread/executors/generic_executor_ref.hpp

@@ -13,7 +13,8 @@
 #include <boost/thread/detail/move.hpp>
 #include <boost/thread/executors/executor.hpp>
 
-#include <boost/shared_ptr.hpp>
+#include <boost/smart_ptr/shared_ptr.hpp>
+#include <boost/smart_ptr/make_shared.hpp>
 
 #include <boost/config/abi_prefix.hpp>
 
@@ -99,8 +100,8 @@ namespace boost
 
     template<typename Executor>
     generic_executor_ref(Executor& ex)
-    //: ex(make_shared<executor_ref<Executor> >(ex)) // todo check why this doesn't works with C++03
-    : ex( new executor_ref<Executor>(ex) )
+    //: ex(make_shared<executor_ref<typename decay<Executor>::type> >(ex)) // todo check why this doesn't work with C++03
+    : ex( new executor_ref<typename decay<Executor>::type>(ex) )
     {
     }
 

include/boost/thread/executors/generic_serial_executor.hpp

@@ -0,0 +1,284 @@
+// Copyright (C) 2013,2015 Vicente J. Botet Escriba
+//
+//  Distributed under the Boost Software License, Version 1.0. (See accompanying
+//  file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+// 2013/11 Vicente J. Botet Escriba
+//    first implementation of a simple serial scheduler.
+
+#ifndef BOOST_THREAD_GENERIC_SERIAL_EXECUTOR_HPP
+#define BOOST_THREAD_GENERIC_SERIAL_EXECUTOR_HPP
+
+#include <boost/thread/detail/config.hpp>
+#include <boost/thread/detail/delete.hpp>
+#include <boost/thread/detail/move.hpp>
+#include <boost/thread/concurrent_queues/sync_queue.hpp>
+#include <boost/thread/executors/work.hpp>
+#include <boost/thread/executors/generic_executor.hpp>
+#include <boost/thread/future.hpp>
+#include <boost/thread/scoped_thread.hpp>
+
+#include <boost/smart_ptr/shared_ptr.hpp>
+#include <boost/smart_ptr/make_shared.hpp>
+#include <boost/utility/enable_if.hpp>
+#include <boost/type_traits/is_same.hpp>
+#include <boost/type_traits/decay.hpp>
+
+#include <boost/thread/caller_context.hpp>
+
+#include <boost/config/abi_prefix.hpp>
+
+namespace boost
+{
+namespace executors
+{
+  class generic_serial_executor
+  {
+  public:
+    /// type-erasure to store the works to do
+    typedef  executors::work work;
+  private:
+
+    struct shared_state {
+      typedef  executors::work work;
+      typedef  scoped_thread<> thread_t;
+
+      /// the thread safe work queue
+      concurrent::sync_queue<work > work_queue;
+      generic_executor ex;
+      thread_t thr;
+
+      struct try_executing_one_task {
+        work& task;
+        boost::promise<void> &p;
+        try_executing_one_task(work& task, boost::promise<void> &p)
+        : task(task), p(p) {}
+        void operator()() {
+          try {
+            task();
+            p.set_value();
+          } catch (...)
+          {
+            p.set_exception(current_exception());
+          }
+        }
+      };
+    public:
+      /**
+       * \par Returns
+       * The underlying executor wrapped on a generic executor reference.
+       */
+      generic_executor& underlying_executor() BOOST_NOEXCEPT { return ex; }
+
+    private:
+
+      /**
+       * The main loop of the worker thread
+       */
+      void worker_thread()
+      {
+        try
+        {
+          for(;;)
+          {
+            work task;
+            queue_op_status st = work_queue.wait_pull(task);
+            if (st == queue_op_status::closed) return;
+
+            boost::promise<void> p;
+            try_executing_one_task tmp(task,p);
+            ex.submit(tmp);
+            p.get_future().wait();
+          }
+        }
+        catch (...)
+        {
+          std::terminate();
+          return;
+        }
+      }
+
+    public:
+      /// shared_state is not copyable.
+      BOOST_THREAD_NO_COPYABLE(shared_state)
+
+      /**
+       * \b Effects: creates a thread pool that runs closures using one of its closure-executing methods.
+       *
+       * \b Throws: Whatever exception is thrown while initializing the needed resources.
+       */
+      template <class Executor>
+      shared_state(Executor const& ex)
+      : ex(ex), thr(&shared_state::worker_thread, this)
+      {
+      }
+      /**
+       * \b Effects: Destroys the thread pool.
+       *
+       * \b Synchronization: The completion of all the closures happen before the completion of the \c shared_state destructor.
+       */
+      ~shared_state()
+      {
+        // signal to the worker thread that there will be no more submissions.
+        close();
+      }
+
+      /**
+       * \b Effects: close the \c generic_serial_executor for submissions.
+       * The loop will work until there is no more closures to run.
+       */
+      void close()
+      {
+        work_queue.close();
+      }
+
+      /**
+       * \b Returns: whether the pool is closed for submissions.
+       */
+      bool closed()
+      {
+        return work_queue.closed();
+      }
+
+      /**
+       * \b Requires: \c Closure is a model of \c Callable(void()) and a model of \c CopyConstructible/MoveConstructible.
+       *
+       * \b Effects: The specified \c closure will be scheduled for execution at some point in the future.
+       * If invoked closure throws an exception the \c generic_serial_executor will call \c std::terminate, as is the case with threads.
+       *
+       * \b Synchronization: completion of \c closure on a particular thread happens before destruction of thread's thread local variables.
+       *
+       * \b Throws: \c sync_queue_is_closed if the thread pool is closed.
+       * Whatever exception that can be throw while storing the closure.
+       */
+
+  #if defined(BOOST_NO_CXX11_RVALUE_REFERENCES)
+      template <typename Closure>
+      void submit(Closure & closure)
+      {
+        work_queue.push(work(closure));
+      }
+  #endif
+      void submit(void (*closure)())
+      {
+        work_queue.push(work(closure));
+      }
+
+      template <typename Closure>
+      void submit(BOOST_THREAD_RV_REF(Closure) closure)
+      {
+        work_queue.push(work(boost::forward<Closure>(closure)));
+      }
+
+    };
+
+  public:
+
+//    generic_serial_executor(generic_serial_executor const&) = default;
+//    generic_serial_executor(generic_serial_executor &&) = default;
+
+    /**
+     * \b Effects: creates a thread pool that runs closures using one of its closure-executing methods.
+     *
+     * \b Throws: Whatever exception is thrown while initializing the needed resources.
+     */
+    template <class Executor>
+    generic_serial_executor(Executor const& ex
+        , typename boost::disable_if<is_same<Executor, generic_serial_executor>,
+          int* >::type =  (int*)0)
+    : pimpl(make_shared<shared_state>(ex))
+    {
+    }
+    /**
+     * \b Effects: Destroys the thread pool.
+     *
+     * \b Synchronization: The completion of all the closures happen before the completion of the \c generic_serial_executor destructor.
+     */
+    ~generic_serial_executor()
+    {
+    }
+
+    /**
+     * \par Returns
+     * The underlying executor wrapped on a generic executor reference.
+     */
+    generic_executor& underlying_executor() BOOST_NOEXCEPT
+    {
+      return pimpl->underlying_executor();
+    }
+
+    /**
+     * \b Returns: always false as a serial executor can not re-enter.
+     * Remark: A serial executor can not execute one of its pending tasks as the tasks depends on the other tasks.
+     */
+    bool try_executing_one()
+    {
+      return false;
+    }
+
+    /**
+     * \b Effects: close the \c generic_serial_executor for submissions.
+     * The loop will work until there is no more closures to run.
+     */
+    void close()
+    {
+      pimpl->close();
+    }
+
+    /**
+     * \b Returns: whether the pool is closed for submissions.
+     */
+    bool closed()
+    {
+      return pimpl->closed();
+    }
+
+    /**
+     * \b Requires: \c Closure is a model of \c Callable(void()) and a model of \c CopyConstructible/MoveConstructible.
+     *
+     * \b Effects: The specified \c closure will be scheduled for execution at some point in the future.
+     * If invoked closure throws an exception the \c generic_serial_executor will call \c std::terminate, as is the case with threads.
+     *
+     * \b Synchronization: completion of \c closure on a particular thread happens before destruction of thread's thread local variables.
+     *
+     * \b Throws: \c sync_queue_is_closed if the thread pool is closed.
+     * Whatever exception that can be throw while storing the closure.
+     */
+
+#if defined(BOOST_NO_CXX11_RVALUE_REFERENCES)
+    template <typename Closure>
+    void submit(Closure & closure)
+    {
+      pimpl->submit(closure);
+    }
+#endif
+    void submit(void (*closure)())
+    {
+      pimpl->submit(closure);
+    }
+
+    template <typename Closure>
+    void submit(BOOST_THREAD_RV_REF(Closure) closure)
+    {
+      pimpl->submit(boost::forward<Closure>(closure));
+    }
+
+    /**
+     * \b Returns: always false as a serial executor can not re-enter.
+     * Remark: A serial executor can not execute one of its pending tasks as the tasks depends on the other tasks.
+     */
+    template <typename Pred>
+    bool reschedule_until(Pred const& pred)
+    {
+      return false;
+    }
+  private:
+    shared_ptr<shared_state> pimpl;
+  };
+}
+using executors::generic_serial_executor;
+}
+
+#include <boost/config/abi_suffix.hpp>
+
+#endif

include/boost/thread/executors/generic_serial_executor_cont.hpp

@@ -0,0 +1,265 @@
+// Copyright (C) 2015 Vicente J. Botet Escriba
+//
+//  Distributed under the Boost Software License, Version 1.0. (See accompanying
+//  file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+// 2013/11 Vicente J. Botet Escriba
+//    first implementation of a simple serial scheduler.
+
+#ifndef BOOST_THREAD_GENERIC_SERIAL_EXECUTOR_CONT_HPP
+#define BOOST_THREAD_GENERIC_SERIAL_EXECUTOR_CONT_HPP
+
+#include <boost/thread/detail/config.hpp>
+#include <boost/thread/detail/delete.hpp>
+#include <boost/thread/detail/move.hpp>
+#include <boost/thread/executors/work.hpp>
+#include <boost/thread/executors/generic_executor.hpp>
+#include <boost/thread/future.hpp>
+#include <boost/thread/scoped_thread.hpp>
+
+#include <boost/smart_ptr/shared_ptr.hpp>
+#include <boost/smart_ptr/make_shared.hpp>
+#include <boost/utility/enable_if.hpp>
+#include <boost/type_traits/is_same.hpp>
+#include <boost/type_traits/decay.hpp>
+
+#include <boost/config/abi_prefix.hpp>
+
+namespace boost
+{
+namespace executors
+{
+  class generic_serial_executor_cont
+  {
+  public:
+    /// type-erasure to store the works to do
+    typedef  executors::work work;
+  private:
+
+    struct shared_state {
+      typedef  executors::work work;
+
+    generic_executor ex_;
+    future<void> fut_; // protected by mtx_
+    bool closed_; // protected by mtx_
+    mutex mtx_;
+
+    struct continuation {
+      work task;
+      template <class X>
+      struct result {
+        typedef void type;
+      };
+      continuation(BOOST_THREAD_RV_REF(work) tsk)
+      : task(boost::move(tsk)) {}
+      void operator()(future<void> f)
+      {
+        try {
+          task();
+        } catch (...)  {
+          std::terminate();
+        }
+      }
+    };
+
+    bool closed(lock_guard<mutex>&) const
+    {
+      return closed_;
+    }
+  public:
+    /**
+     * \par Returns
+     * The underlying executor wrapped on a generic executor reference.
+     */
+    generic_executor& underlying_executor() BOOST_NOEXCEPT { return ex_; }
+
+    /// shared_state is not copyable.
+    BOOST_THREAD_NO_COPYABLE(shared_state)
+
+    /**
+     * \b Effects: creates a serial executor that runs closures in fifo order using one the associated executor.
+     *
+     * \b Throws: Whatever exception is thrown while initializing the needed resources.
+     *
+     * \b Notes:
+     * * The lifetime of the associated executor must outlive the serial executor.
+     * * The current implementation doesn't support submission from synchronous continuation, that is,
+     *     - the executor must execute the continuation asynchronously or
+     *     - the continuation can not submit to this serial executor.
+     */
+    template <class Executor>
+    shared_state(Executor const& ex)
+    : ex_(ex), fut_(make_ready_future()), closed_(false)
+    {
+    }
+    /**
+     * \b Effects: Destroys the thread pool.
+     *
+     * \b Synchronization: The completion of all the closures happen before the completion of the \c generic_serial_executor_cont destructor.
+     */
+    ~shared_state()
+    {
+      // signal to the worker thread that there will be no more submissions.
+      close();
+    }
+
+    /**
+     * \b Effects: close the \c generic_serial_executor_cont for submissions.
+     * The loop will work until there is no more closures to run.
+     */
+    void close()
+    {
+      lock_guard<mutex> lk(mtx_);
+      closed_ = true;;
+    }
+
+    /**
+     * \b Returns: whether the pool is closed for submissions.
+     */
+    bool closed()
+    {
+      lock_guard<mutex> lk(mtx_);
+      return closed(lk);
+    }
+
+    /**
+     * \b Requires: \c Closure is a model of \c Callable(void()) and a model of \c CopyConstructible/MoveConstructible.
+     *
+     * \b Effects: The specified \c closure will be scheduled for execution after the last submitted closure finish.
+     * If the invoked closure throws an exception the \c generic_serial_executor_cont will call \c std::terminate, as is the case with threads.
+     *
+     * \b Throws: \c sync_queue_is_closed if the executor is closed.
+     * Whatever exception that can be throw while storing the closure.
+     *
+     */
+
+#if defined(BOOST_NO_CXX11_RVALUE_REFERENCES)
+    template <typename Closure>
+    void submit(Closure & closure)
+    {
+      lock_guard<mutex> lk(mtx_);
+      if (closed(lk))       BOOST_THROW_EXCEPTION( sync_queue_is_closed() );
+      fut_ = fut_.then(ex_, continuation(work(closure)));
+    }
+#endif
+    void submit(void (*closure)())
+    {
+      lock_guard<mutex> lk(mtx_);
+      if (closed(lk))       BOOST_THROW_EXCEPTION( sync_queue_is_closed() );
+      fut_ = fut_.then(ex_, continuation(work(closure)));
+    }
+
+    template <typename Closure>
+    void submit(BOOST_THREAD_RV_REF(Closure) closure)
+    {
+      lock_guard<mutex> lk(mtx_);
+      if (closed(lk))       BOOST_THROW_EXCEPTION( sync_queue_is_closed() );
+      fut_ = fut_.then(ex_, continuation(work(boost::forward<Closure>(closure))));
+    }
+    };
+  public:
+    /**
+     * \b Effects: creates a thread pool that runs closures using one of its closure-executing methods.
+     *
+     * \b Throws: Whatever exception is thrown while initializing the needed resources.
+     */
+    template <class Executor>
+    generic_serial_executor_cont(Executor const& ex
+                , typename boost::disable_if<is_same<Executor, generic_serial_executor_cont>,
+                  int* >::type =  (int*)0)
+    : pimpl(make_shared<shared_state>(ex))
+    {
+    }
+    /**
+     * \b Effects: Destroys the thread pool.
+     *
+     * \b Synchronization: The completion of all the closures happen before the completion of the \c serial_executor destructor.
+     */
+    ~generic_serial_executor_cont()
+    {
+    }
+
+    /**
+     * \par Returns
+     * The underlying executor wrapped on a generic executor reference.
+     */
+    generic_executor& underlying_executor() BOOST_NOEXCEPT
+    {
+      return pimpl->underlying_executor();
+    }
+
+    /**
+     * \b Returns: always false as a serial executor can not re-enter.
+     * Remark: A serial executor can not execute one of its pending tasks as the tasks depends on the other tasks.
+     */
+    bool try_executing_one()
+    {
+      return false;
+    }
+
+    /**
+     * \b Effects: close the \c serial_executor for submissions.
+     * The loop will work until there is no more closures to run.
+     */
+    void close()
+    {
+      pimpl->close();
+    }
+
+    /**
+     * \b Returns: whether the pool is closed for submissions.
+     */
+    bool closed()
+    {
+      return pimpl->closed();
+    }
+
+    /**
+     * \b Requires: \c Closure is a model of \c Callable(void()) and a model of \c CopyConstructible/MoveConstructible.
+     *
+     * \b Effects: The specified \c closure will be scheduled for execution at some point in the future.
+     * If invoked closure throws an exception the \c serial_executor will call \c std::terminate, as is the case with threads.
+     *
+     * \b Synchronization: completion of \c closure on a particular thread happens before destruction of thread's thread local variables.
+     *
+     * \b Throws: \c sync_queue_is_closed if the thread pool is closed.
+     * Whatever exception that can be throw while storing the closure.
+     */
+
+#if defined(BOOST_NO_CXX11_RVALUE_REFERENCES)
+    template <typename Closure>
+    void submit(Closure & closure)
+    {
+      pimpl->submit(closure);
+    }
+#endif
+    void submit(void (*closure)())
+    {
+      pimpl->submit(closure);
+    }
+
+    template <typename Closure>
+    void submit(BOOST_THREAD_RV_REF(Closure) closure)
+    {
+      pimpl->submit(boost::forward<Closure>(closure));
+    }
+
+    /**
+     * \b Returns: always false as a serial executor can not re-enter.
+     * Remark: A serial executor can not execute one of its pending tasks as the tasks depends on the other tasks.
+     */
+    template <typename Pred>
+    bool reschedule_until(Pred const& pred)
+    {
+      return false;
+    }
+  private:
+    shared_ptr<shared_state> pimpl;
+  };
+}
+using executors::generic_serial_executor_cont;
+}
+
+#include <boost/config/abi_suffix.hpp>
+
+#endif

include/boost/thread/executors/inline_executor.hpp

@@ -1,4 +1,4 @@
-// Copyright (C) 2014 Vicente J. Botet Escriba
+// Copyright (C) 2014-2015 Vicente J. Botet Escriba
 //
 //  Distributed under the Boost Software License, Version 1.0. (See accompanying
 //  file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
@@ -14,6 +14,9 @@
 #include <boost/thread/detail/move.hpp>
 #include <boost/thread/executors/work.hpp>
 
+#include <boost/smart_ptr/shared_ptr.hpp>
+#include <boost/smart_ptr/make_shared.hpp>
+
 #include <boost/config/abi_prefix.hpp>
 
 namespace boost
@@ -25,142 +28,227 @@ namespace executors
   public:
     /// type-erasure to store the works to do
     typedef  executors::work work;
-    bool closed_;
-    mutable mutex mtx_;
-    /**
-     * Effects: try to execute one task.
-     * Returns: whether a task has been executed.
-     * Throws: whatever the current task constructor throws or the task() throws.
-     */
-    bool try_executing_one()
-    {
-      return false;
-    }
+  private:
 
+    struct shared_state {
+      typedef  executors::work work;
+
+      bool closed_;
+      mutable mutex mtx_;
+
+      /**
+       * Effects: try to execute one task.
+       * Returns: whether a task has been executed.
+       * Throws: whatever the current task constructor throws or the task() throws.
+       */
+      bool try_executing_one()
+      {
+        return false;
+      }
+
+      /// shared_state is not copyable.
+      BOOST_THREAD_NO_COPYABLE(shared_state)
+
+      /**
+       * \b Effects: creates a inline executor that runs closures immediately.
+       *
+       * \b Throws: Nothing.
+       */
+      shared_state()
+      : closed_(false)
+      {
+      }
+      /**
+       * \b Effects: Destroys the inline executor.
+       *
+       * \b Synchronization: The completion of all the closures happen before the completion of the \c inline_executor destructor.
+       */
+      ~shared_state()
+      {
+        // signal to all the worker thread that there will be no more submissions.
+        close();
+      }
+
+      /**
+       * \b Effects: close the \c inline_executor for submissions.
+       * The loop will work until there is no more closures to run.
+       */
+      void close()
+      {
+        lock_guard<mutex> lk(mtx_);
+        closed_ = true;
+      }
+
+      /**
+       * \b Returns: whether the pool is closed for submissions.
+       */
+      bool closed(lock_guard<mutex>& )  const
+      {
+        return closed_;
+      }
+      bool closed() const
+      {
+        lock_guard<mutex> lk(mtx_);
+        return closed(lk);
+      }
+
+      /**
+       * \b Requires: \c Closure is a model of \c Callable(void()) and a model of \c CopyConstructible/MoveConstructible.
+       *
+       * \b Effects: The specified \c closure will be scheduled for execution at some point in the future.
+       * If invoked closure throws an exception the \c inline_executor will call \c std::terminate, as is the case with threads.
+       *
+       * \b Synchronization: completion of \c closure on a particular thread happens before destruction of thread's thread local variables.
+       *
+       * \b Throws: \c sync_queue_is_closed if the thread pool is closed.
+       * Whatever exception that can be throw while storing the closure.
+       */
+
+  #if defined(BOOST_NO_CXX11_RVALUE_REFERENCES)
+      template <typename Closure>
+      void submit(Closure & closure)
+      {
+        {
+          lock_guard<mutex> lk(mtx_);
+          if (closed(lk))  BOOST_THROW_EXCEPTION( sync_queue_is_closed() );
+        }
+        try
+        {
+          closure();
+        }
+        catch (...)
+        {
+          std::terminate();
+          return;
+        }
+      }
+  #endif
+      void submit(void (*closure)())
+      {
+        {
+          lock_guard<mutex> lk(mtx_);
+          if (closed(lk))  BOOST_THROW_EXCEPTION( sync_queue_is_closed() );
+        }
+        try
+        {
+          closure();
+        }
+        catch (...)
+        {
+          std::terminate();
+          return;
+        }
+      }
+
+      template <typename Closure>
+      void submit(BOOST_THREAD_FWD_REF(Closure) closure)
+      {
+        {
+          lock_guard<mutex> lk(mtx_);
+          if (closed(lk))  BOOST_THROW_EXCEPTION( sync_queue_is_closed() );
+        }
+        try
+        {
+          closure();
+        }
+        catch (...)
+        {
+          std::terminate();
+          return;
+        }
+      }
+
+      /**
+       * \b Requires: This must be called from an scheduled task.
+       *
+       * \b Effects: reschedule functions until pred()
+       */
+      template <typename Pred>
+      bool reschedule_until(Pred const& )
+      {
+        return false;
+      }
+  };
   public:
-    /// inline_executor is not copyable.
-    BOOST_THREAD_NO_COPYABLE(inline_executor)
+  /**
+   * \b Effects: creates a inline executor that runs closures immediately.
+   *
+   * \b Throws: Nothing.
+   */
+  inline_executor()
+  : pimpl(make_shared<shared_state>())
+  {
+  }
 
-    /**
-     * \b Effects: creates a inline executor that runs closures immediately.
-     *
-     * \b Throws: Nothing.
-     */
-    inline_executor()
-    : closed_(false)
-    {
-    }
-    /**
-     * \b Effects: Destroys the inline executor.
-     *
-     * \b Synchronization: The completion of all the closures happen before the completion of the \c inline_executor destructor.
-     */
-    ~inline_executor()
-    {
-      // signal to all the worker thread that there will be no more submissions.
-      close();
-    }
+  /**
+   * \b Effects: close the \c inline_executor for submissions.
+   * The loop will work until there is no more closures to run.
+   */
+  void close()
+  {
+    pimpl->close();
+  }
 
-    /**
-     * \b Effects: close the \c inline_executor for submissions.
-     * The loop will work until there is no more closures to run.
-     */
-    void close()
-    {
-      lock_guard<mutex> lk(mtx_);
-      closed_ = true;
-    }
+  /**
+   * \b Returns: whether the executor is closed for submissions.
+   */
+  bool closed() const
+  {
+    return pimpl->closed();
+  }
 
-    /**
-     * \b Returns: whether the pool is closed for submissions.
-     */
-    bool closed(lock_guard<mutex>& )
-    {
-      return closed_;
-    }
-    bool closed()
-    {
-      lock_guard<mutex> lk(mtx_);
-      return closed(lk);
-    }
-
-    /**
-     * \b Requires: \c Closure is a model of \c Callable(void()) and a model of \c CopyConstructible/MoveConstructible.
-     *
-     * \b Effects: The specified \c closure will be scheduled for execution at some point in the future.
-     * If invoked closure throws an exception the \c inline_executor will call \c std::terminate, as is the case with threads.
-     *
-     * \b Synchronization: completion of \c closure on a particular thread happens before destruction of thread's thread local variables.
-     *
-     * \b Throws: \c sync_queue_is_closed if the thread pool is closed.
-     * Whatever exception that can be throw while storing the closure.
-     */
+  /**
+   * \b Requires: \c Closure is a model of \c Callable(void()) and a model of \c CopyConstructible/MoveConstructible.
+   *
+   * \b Effects: The specified \c closure will be scheduled for execution at some point in the future.
+   * If invoked closure throws an exception the \c inline_executor will call \c std::terminate, as is the case with threads.
+   *
+   * \b Synchronization: completion of \c closure on a particular thread happens before destruction of thread's thread local variables.
+   *
+   * \b Throws: \c sync_queue_is_closed if the thread pool is closed.
+   * Whatever exception that can be throw while storing the closure.
+   */
 
 #if defined(BOOST_NO_CXX11_RVALUE_REFERENCES)
-    template <typename Closure>
-    void submit(Closure & closure)
-    {
-      {
-        lock_guard<mutex> lk(mtx_);
-        if (closed(lk))  BOOST_THROW_EXCEPTION( sync_queue_is_closed() );
-      }
-      try
-      {
-        closure();
-      }
-      catch (...)
-      {
-        std::terminate();
-        return;
-      }
-    }
+  template <typename Closure>
+  void submit(Closure & closure)
+  {
+    pimpl->submit(closure);
+  }
 #endif
-    void submit(void (*closure)())
-    {
-      {
-        lock_guard<mutex> lk(mtx_);
-        if (closed(lk))  BOOST_THROW_EXCEPTION( sync_queue_is_closed() );
-      }
-      try
-      {
-        closure();
-      }
-      catch (...)
-      {
-        std::terminate();
-        return;
-      }
-    }
+  void submit(void (*closure)())
+  {
+    pimpl->submit(closure);
+  }
 
-    template <typename Closure>
-    void submit(BOOST_THREAD_FWD_REF(Closure) closure)
-    {
-      {
-        lock_guard<mutex> lk(mtx_);
-        if (closed(lk))  BOOST_THROW_EXCEPTION( sync_queue_is_closed() );
-      }
-      try
-      {
-        closure();
-      }
-      catch (...)
-      {
-        std::terminate();
-        return;
-      }
-    }
+  template <typename Closure>
+  void submit(BOOST_THREAD_FWD_REF(Closure) closure)
+  {
+    pimpl->submit(boost::forward<Closure>(closure));
+  }
 
-    /**
-     * \b Requires: This must be called from an scheduled task.
-     *
-     * \b Effects: reschedule functions until pred()
-     */
-    template <typename Pred>
-    bool reschedule_until(Pred const& )
-    {
-      return false;
-    }
+  /**
+   * Effects: try to execute one task.
+   * Returns: whether a task has been executed.
+   * Throws: whatever the current task constructor throws or the task() throws.
+   */
+  bool try_executing_one()
+  {
+    return pimpl->try_executing_one();
+  }
 
+  /**
+   * \b Requires: This must be called from an scheduled task.
+   *
+   * \b Effects: reschedule functions until pred()
+   */
+  template <typename Pred>
+  bool reschedule_until(Pred const& p)
+  {
+    return pimpl->reschedule_until(p);
+  }
+  private:
+    shared_ptr<shared_state> pimpl;
   };
 }
 using executors::inline_executor;

include/boost/thread/executors/loop_executor.hpp

@@ -1,4 +1,4 @@
-// Copyright (C) 2013,2014 Vicente J. Botet Escriba
+// Copyright (C) 2013-2015 Vicente J. Botet Escriba
 //
 //  Distributed under the Boost Software License, Version 1.0. (See accompanying
 //  file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
@@ -17,6 +17,9 @@
 #include <boost/thread/concurrent_queues/sync_queue.hpp>
 #include <boost/thread/executors/work.hpp>
 
+#include <boost/smart_ptr/shared_ptr.hpp>
+#include <boost/smart_ptr/make_shared.hpp>
+
 #include <boost/config/abi_prefix.hpp>
 
 namespace boost
@@ -30,59 +33,170 @@ namespace executors
     /// type-erasure to store the works to do
     typedef  executors::work work;
   private:
-    /// the thread safe work queue
-    concurrent::sync_queue<work > work_queue;
 
-  public:
-    /**
-     * Effects: try to execute one task.
-     * Returns: whether a task has been executed.
-     * Throws: whatever the current task constructor throws or the task() throws.
-     */
-    bool try_executing_one()
-    {
-      work task;
-      try
+    struct shared_state {
+      typedef  executors::work work;
+      /// the thread safe work queue
+      concurrent::sync_queue<work > work_queue;
+
+      /**
+       * Effects: try to execute one task.
+       * Returns: whether a task has been executed.
+       * Throws: whatever the current task constructor throws or the task() throws.
+       */
+      bool try_executing_one()
       {
-        if (work_queue.try_pull(task) == queue_op_status::success)
+        work task;
+        try
         {
+          if (work_queue.try_pull(task) == queue_op_status::success)
+          {
+            task();
+            return true;
+          }
+          return false;
+        }
+        catch (...)
+        {
+          std::terminate();
+          return false;
+        }
+      }
+      /**
+       * Effects: schedule one task or yields
+       * Throws: whatever the current task constructor throws or the task() throws.
+       */
+      void schedule_one_or_yield()
+      {
+          if ( ! try_executing_one())
+          {
+            this_thread::yield();
+          }
+      }
+
+      /// loop_executor is not copyable.
+      BOOST_THREAD_NO_COPYABLE(shared_state)
+
+      /**
+       * \b Effects: creates a thread pool that runs closures using one of its closure-executing methods.
+       *
+       * \b Throws: Whatever exception is thrown while initializing the needed resources.
+       */
+      shared_state()
+      {
+      }
+      /**
+       * \b Effects: Destroys the thread pool.
+       *
+       * \b Synchronization: The completion of all the closures happen before the completion of the \c loop_executor destructor.
+       */
+      ~shared_state()
+      {
+        // signal to all the worker thread that there will be no more submissions.
+        close();
+      }
+
+      /**
+       * The main loop of the worker thread
+       */
+      void loop()
+      {
+        while (!closed())
+        {
+          schedule_one_or_yield();
+        }
+        while (try_executing_one())
+        {
+        }
+      }
+
+      /**
+       * \b Effects: close the \c loop_executor for submissions.
+       * The loop will work until there is no more closures to run.
+       */
+      void close()
+      {
+        work_queue.close();
+      }
+
+      /**
+       * \b Returns: whether the pool is closed for submissions.
+       */
+      bool closed()
+      {
+        return work_queue.closed();
+      }
+
+      /**
+       * \b Requires: \c Closure is a model of \c Callable(void()) and a model of \c CopyConstructible/MoveConstructible.
+       *
+       * \b Effects: The specified \c closure will be scheduled for execution at some point in the future.
+       * If invoked closure throws an exception the \c loop_executor will call \c std::terminate, as is the case with threads.
+       *
+       * \b Synchronization: completion of \c closure on a particular thread happens before destruction of thread's thread local variables.
+       *
+       * \b Throws: \c sync_queue_is_closed if the thread pool is closed.
+       * Whatever exception that can be throw while storing the closure.
+       */
+
+  #if defined(BOOST_NO_CXX11_RVALUE_REFERENCES)
+      template <typename Closure>
+      void submit(Closure & closure)
+      {
+        work_queue.push(work(closure));
+      }
+  #endif
+      void submit(void (*closure)())
+      {
+        work_queue.push(work(closure));
+      }
+
+      template <typename Closure>
+      void submit(BOOST_THREAD_RV_REF(Closure) closure)
+      {
+        work_queue.push(work(boost::forward<Closure>(closure)));
+      }
+
+      /**
+       * \b Requires: This must be called from an scheduled task.
+       *
+       * \b Effects: reschedule functions until pred()
+       */
+      template <typename Pred>
+      bool reschedule_until(Pred const& pred)
+      {
+        do {
+          if ( ! try_executing_one())
+          {
+            return false;
+          }
+        } while (! pred());
+        return true;
+      }
+
+      /**
+       * run queued closures
+       */
+      void run_queued_closures()
+      {
+        sync_queue<work>::underlying_queue_type q = work_queue.underlying_queue();
+        while (! q.empty())
+        {
+          work& task = q.front();
           task();
-          return true;
+          q.pop_front();
         }
-        return false;
       }
-      catch (...)
-      {
-        std::terminate();
-        return false;
-      }
-    }
-  private:
-    /**
-     * Effects: schedule one task or yields
-     * Throws: whatever the current task constructor throws or the task() throws.
-     */
-    void schedule_one_or_yield()
-    {
-        if ( ! try_executing_one())
-        {
-          this_thread::yield();
-        }
-    }
-
-
-
 
+    };
   public:
-    /// loop_executor is not copyable.
-    BOOST_THREAD_NO_COPYABLE(loop_executor)
-
     /**
      * \b Effects: creates a thread pool that runs closures using one of its closure-executing methods.
      *
      * \b Throws: Whatever exception is thrown while initializing the needed resources.
      */
     loop_executor()
+    : pimpl(make_shared<shared_state>())
     {
     }
     /**
@@ -92,22 +206,33 @@ namespace executors
      */
     ~loop_executor()
     {
-      // signal to all the worker thread that there will be no more submissions.
-      close();
     }
 
+    /**
+     * Effects: try to execute one task.
+     * Returns: whether a task has been executed.
+     * Throws: whatever the current task constructor throws or the task() throws.
+     */
+    bool try_executing_one()
+    {
+      return pimpl->try_executing_one();
+    }
+//    /**
+//     * Effects: schedule one task or yields
+//     * Throws: whatever the current task constructor throws or the task() throws.
+//     */
+//    void schedule_one_or_yield()
+//    {
+//      return pimpl->schedule_one_or_yield();
+//    }
+
+
     /**
      * The main loop of the worker thread
      */
     void loop()
     {
-      while (!closed())
-      {
-        schedule_one_or_yield();
-      }
-      while (try_executing_one())
-      {
-      }
+      pimpl->loop();
     }
 
     /**
@@ -116,7 +241,7 @@ namespace executors
      */
     void close()
     {
-      work_queue.close();
+      pimpl->close();
     }
 
     /**
@@ -124,7 +249,7 @@ namespace executors
      */
     bool closed()
     {
-      return work_queue.closed();
+      return pimpl->closed();
     }
 
     /**
@@ -143,18 +268,18 @@ namespace executors
     template <typename Closure>
     void submit(Closure & closure)
     {
-      work_queue.push(work(closure));
+      pimpl->submit(closure);
     }
 #endif
     void submit(void (*closure)())
     {
-      work_queue.push(work(closure));
+      pimpl->submit(closure);
     }
 
     template <typename Closure>
     void submit(BOOST_THREAD_RV_REF(Closure) closure)
     {
-      work_queue.push(work(boost::forward<Closure>(closure)));
+      pimpl->submit(boost::forward<Closure>(closure));
     }
 
     /**
@@ -165,13 +290,7 @@ namespace executors
     template <typename Pred>
     bool reschedule_until(Pred const& pred)
     {
-      do {
-        if ( ! try_executing_one())
-        {
-          return false;
-        }
-      } while (! pred());
-      return true;
+      return pimpl->reschedule_until(pred);
     }
 
     /**
@@ -179,15 +298,10 @@ namespace executors
      */
     void run_queued_closures()
     {
-      sync_queue<work>::underlying_queue_type q = work_queue.underlying_queue();
-      while (! q.empty())
-      {
-        work& task = q.front();
-        task();
-        q.pop_front();
-      }
+      pimpl->run_queued_closures();
     }
-
+  private:
+    shared_ptr<shared_state> pimpl;
   };
 }
 using executors::loop_executor;

include/boost/thread/executors/scheduled_thread_pool.hpp

@@ -9,36 +9,123 @@
 #define BOOST_THREAD_EXECUTORS_SCHEDULED_THREAD_POOL_HPP
 
 #include <boost/thread/executors/detail/scheduled_executor_base.hpp>
+#include <boost/thread/executors/work.hpp>
+#include <boost/thread/detail/move.hpp>
+#include <boost/thread/scoped_thread.hpp>
+#include <boost/thread/csbl/vector.hpp>
+#include <boost/smart_ptr/shared_ptr.hpp>
+#include <boost/smart_ptr/make_shared.hpp>
 
 namespace boost
 {
 namespace executors
 {
 
-  class scheduled_thread_pool : public detail::scheduled_executor_base<>
+  template <class Clock = chrono::steady_clock>
+  class scheduled_thread_pool
   {
   private:
-    thread_group _workers;
-  public:
 
-    scheduled_thread_pool(size_t num_threads) : super()
-    {
-      for(size_t i = 0; i < num_threads; i++)
+    struct shared_state : public detail::scheduled_executor_base<> {
+
+      /// basic_thread_pool is not copyable.
+      BOOST_THREAD_NO_COPYABLE(shared_state)
+
+      typedef detail::scheduled_executor_base<> super;
+      typedef typename super::work work;
+
+      typedef scoped_thread<> thread_t;
+      typedef csbl::vector<thread_t> thread_vector;
+      thread_vector threads;
+
+      shared_state(unsigned const thread_count = thread::hardware_concurrency()+1) : super()
       {
-        _workers.create_thread(bind(&super::loop, this));
+
+        try
+        {
+          threads.reserve(thread_count);
+          for (unsigned i = 0; i < thread_count; ++i)
+          {
+  #if 1
+            thread th (&shared_state::loop, this);
+            threads.push_back(thread_t(boost::move(th)));
+  #else
+            threads.push_back(thread_t(&shared_state::loop, this)); // do not compile
+  #endif
+          }
+        }
+        catch (...)
+        {
+          close();
+          throw;
+        }
       }
+
+      /**
+       * \b Effects: Destroys the thread pool.
+       *
+       * \b Synchronization: The completion of all the closures happen before the completion of the \c basic_thread_pool destructor.
+       */
+      ~shared_state()
+      {
+        this->close();
+      }
+    }; //end class
+
+  public:
+    typedef typename shared_state::work work;
+    typedef Clock clock;
+    typedef typename clock::duration duration;
+    typedef typename clock::time_point time_point;
+
+
+    /**
+     * \b Effects: creates a thread pool that runs closures on \c thread_count threads.
+     *
+     * \b Throws: Whatever exception is thrown while initializing the needed resources.
+     */
+    scheduled_thread_pool(unsigned const thread_count = thread::hardware_concurrency()+1)
+    : pimpl(make_shared<shared_state>(thread_count))
+    {
     }
 
+    /**
+     * \b Effects: Destroys the thread pool.
+     *
+     * \b Synchronization: The completion of all the closures happen before the completion of the \c basic_thread_pool destructor.
+     */
     ~scheduled_thread_pool()
     {
-      this->close();
-      _workers.join_all();
+    }
+    /**
+     * \b Effects: close the \c serial_executor for submissions.
+     * The loop will work until there is no more closures to run.
+     */
+    void close()
+    {
+      pimpl->close();
     }
 
-  private:
-    typedef detail::scheduled_executor_base<> super;
-  }; //end class
+    /**
+     * \b Returns: whether the pool is closed for submissions.
+     */
+    bool closed()
+    {
+      return pimpl->closed();
+    }
 
+    void submit_at(work w, const time_point& tp)
+    {
+      return pimpl->submit_at(boost::move(w), tp);
+    }
+
+    void submit_after(work w, const duration& d)
+    {
+      return pimpl->submit_after(boost::move(w), d);
+    }
+  private:
+    shared_ptr<shared_state> pimpl;
+  };
 } //end executors namespace
 
 using executors::scheduled_thread_pool;

include/boost/thread/executors/scheduler.hpp

@@ -1,4 +1,4 @@
-// Copyright (C) 2014 Vicente J. Botet Escriba
+// Copyright (C) 2014-2015 Vicente J. Botet Escriba
 //
 //  Distributed under the Boost Software License, Version 1.0. (See accompanying
 //  file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
@@ -13,6 +13,8 @@
 #include <boost/chrono/time_point.hpp>
 #include <boost/chrono/duration.hpp>
 #include <boost/chrono/system_clocks.hpp>
+#include <boost/smart_ptr/shared_ptr.hpp>
+#include <boost/smart_ptr/make_shared.hpp>
 
 #include <boost/config/abi_prefix.hpp>
 
@@ -36,7 +38,7 @@ namespace boost
       }
 
     private:
-      Executor&   ex;
+      Executor   ex;
       Function funct;
     };
 
@@ -100,8 +102,8 @@ namespace boost
       }
 
     private:
-      Scheduler&  sch;
-      Executor&   ex;
+      Scheduler   sch;
+      Executor   ex;
       typename clock::time_point  tp;
       bool  is_closed;
     };
@@ -150,8 +152,8 @@ namespace boost
       }
 
     private:
-      Scheduler& sch;
-      Executor& ex;
+      Scheduler sch;
+      Executor ex;
     }; //end class
 
     /// Wraps a reference to a @c Scheduler providing an @c Executor that
@@ -208,7 +210,7 @@ namespace boost
       }
 
     private:
-      Scheduler& sch;
+      Scheduler sch;
       time_point  tp;
       bool  is_closed;
     }; //end class
@@ -217,22 +219,71 @@ namespace boost
     /// It provides factory helper functions such as at/after that convert a @c Scheduler into an @c Executor
     /// that submit the work at/after a specific time/duration respectively.
     template <class Clock = chrono::steady_clock>
-    class scheduler : public detail::scheduled_executor_base<Clock>
+    class scheduler
     {
-    public:
-      typedef typename detail::scheduled_executor_base<Clock>::work work;
+    private:
 
+      struct shared_state : public detail::scheduled_executor_base<Clock> {
+        typedef detail::scheduled_executor_base<Clock> super;
+        typedef typename super::work work;
+        thread thr;
+
+        /// shared_state is not copyable.
+        BOOST_THREAD_NO_COPYABLE(shared_state)
+
+        shared_state()
+          : super(),
+            thr(&super::loop, this) {}
+
+        ~shared_state()
+        {
+          this->close();
+          thr.join();
+        }
+
+      };
+
+    public:
+      typedef typename shared_state::work work;
       typedef Clock clock;
+      typedef typename clock::duration duration;
+      typedef typename clock::time_point time_point;
 
       scheduler()
-        : super(),
-          thr(&super::loop, this) {}
+        : pimpl(make_shared<shared_state>())
+      {}
 
       ~scheduler()
       {
-        this->close();
-        thr.join();
       }
+
+      /**
+       * \b Effects: close the \c serial_executor for submissions.
+       * The loop will work until there is no more closures to run.
+       */
+      void close()
+      {
+        pimpl->close();
+      }
+
+      /**
+       * \b Returns: whether the pool is closed for submissions.
+       */
+      bool closed()
+      {
+        return pimpl->closed();
+      }
+
+      void submit_at(work w, const time_point& tp)
+      {
+        return pimpl->submit_at(boost::move(w), tp);
+      }
+
+      void submit_after(work w, const duration& d)
+      {
+        return pimpl->submit_after(boost::move(w), d);
+      }
+
       template <class Ex>
       scheduler_executor_wrapper<scheduler, Ex> on(Ex& ex)
       {
@@ -250,13 +301,10 @@ namespace boost
       {
         return at_executor<scheduler>(*this, tp);
       }
-
     private:
-      typedef detail::scheduled_executor_base<Clock> super;
-      thread thr;
+      shared_ptr<shared_state> pimpl;
     };
 
-
   }
   using executors::resubmitter;
   using executors::resubmit;

include/boost/thread/executors/scheduling_adaptor.hpp

@@ -19,7 +19,7 @@ namespace executors
   class scheduling_adpator : public detail::scheduled_executor_base<>
   {
   private:
-    Executor& _exec;
+    Executor _exec;
     thread _scheduler;
   public:
 

include/boost/thread/executors/serial_executor.hpp

@@ -1,4 +1,4 @@
-// Copyright (C) 2013 Vicente J. Botet Escriba
+// Copyright (C) 2013,2015 Vicente J. Botet Escriba
 //
 //  Distributed under the Boost Software License, Version 1.0. (See accompanying
 //  file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
@@ -14,116 +14,168 @@
 #include <boost/thread/detail/move.hpp>
 #include <boost/thread/concurrent_queues/sync_queue.hpp>
 #include <boost/thread/executors/work.hpp>
-#include <boost/thread/executors/generic_executor_ref.hpp>
+#include <boost/thread/executors/generic_executor.hpp>
 #include <boost/thread/future.hpp>
 #include <boost/thread/scoped_thread.hpp>
 
+#include <boost/smart_ptr/shared_ptr.hpp>
+#include <boost/smart_ptr/make_shared.hpp>
+
 #include <boost/config/abi_prefix.hpp>
 
 namespace boost
 {
 namespace executors
 {
+  template <class Executor>
   class serial_executor
   {
   public:
     /// type-erasure to store the works to do
     typedef  executors::work work;
   private:
-    typedef  scoped_thread<> thread_t;
 
-    /// the thread safe work queue
-    concurrent::sync_queue<work > work_queue;
-    generic_executor_ref ex;
-    thread_t thr;
+    struct shared_state {
+      typedef  executors::work work;
+      typedef  scoped_thread<> thread_t;
 
-    struct try_executing_one_task {
-      work& task;
-      boost::promise<void> &p;
-      try_executing_one_task(work& task, boost::promise<void> &p)
-      : task(task), p(p) {}
-      void operator()() {
-        try {
-          task();
-          p.set_value();
-        } catch (...)
+      /// the thread safe work queue
+      concurrent::sync_queue<work > work_queue;
+      Executor ex;
+      thread_t thr;
+
+      struct try_executing_one_task {
+        work& task;
+        boost::promise<void> &p;
+        try_executing_one_task(work& task, boost::promise<void> &p)
+        : task(task), p(p) {}
+        void operator()() {
+          try {
+            task();
+            p.set_value();
+          } catch (...)
+          {
+            p.set_exception(current_exception());
+          }
+        }
+      };
+    public:
+      /**
+       * \par Returns
+       * The underlying executor wrapped on a generic executor reference.
+       */
+      Executor& underlying_executor() BOOST_NOEXCEPT { return ex; }
+
+    private:
+
+      /**
+       * The main loop of the worker thread
+       */
+      void worker_thread()
+      {
+        try
         {
-          p.set_exception(current_exception());
+          for(;;)
+          {
+            work task;
+            queue_op_status st = work_queue.wait_pull(task);
+            if (st == queue_op_status::closed) return;
+
+            boost::promise<void> p;
+            try_executing_one_task tmp(task,p);
+            ex.submit(tmp);
+            p.get_future().wait();
+          }
+        }
+        catch (...)
+        {
+          std::terminate();
+          return;
         }
       }
+
+    public:
+      /// shared_state is not copyable.
+      BOOST_THREAD_NO_COPYABLE(shared_state)
+
+      /**
+       * \b Effects: creates a thread pool that runs closures using one of its closure-executing methods.
+       *
+       * \b Throws: Whatever exception is thrown while initializing the needed resources.
+       */
+      shared_state(Executor& ex)
+      : ex(ex), thr(&shared_state::worker_thread, this)
+      {
+      }
+      /**
+       * \b Effects: Destroys the thread pool.
+       *
+       * \b Synchronization: The completion of all the closures happen before the completion of the \c shared_state destructor.
+       */
+      ~shared_state()
+      {
+        // signal to the worker thread that there will be no more submissions.
+        close();
+      }
+
+      /**
+       * \b Effects: close the \c serial_executor for submissions.
+       * The loop will work until there is no more closures to run.
+       */
+      void close()
+      {
+        work_queue.close();
+      }
+
+      /**
+       * \b Returns: whether the pool is closed for submissions.
+       */
+      bool closed()
+      {
+        return work_queue.closed();
+      }
+
+      /**
+       * \b Requires: \c Closure is a model of \c Callable(void()) and a model of \c CopyConstructible/MoveConstructible.
+       *
+       * \b Effects: The specified \c closure will be scheduled for execution at some point in the future.
+       * If invoked closure throws an exception the \c serial_executor will call \c std::terminate, as is the case with threads.
+       *
+       * \b Synchronization: completion of \c closure on a particular thread happens before destruction of thread's thread local variables.
+       *
+       * \b Throws: \c sync_queue_is_closed if the thread pool is closed.
+       * Whatever exception that can be throw while storing the closure.
+       */
+
+  #if defined(BOOST_NO_CXX11_RVALUE_REFERENCES)
+      template <typename Closure>
+      void submit(Closure & closure)
+      {
+        work_queue.push(work(closure));
+      }
+  #endif
+      void submit(void (*closure)())
+      {
+        work_queue.push(work(closure));
+      }
+
+      template <typename Closure>
+      void submit(BOOST_THREAD_RV_REF(Closure) closure)
+      {
+        work_queue.push(work(boost::forward<Closure>(closure)));
+      }
+
     };
-  public:
-    /**
-     * \par Returns
-     * The underlying executor wrapped on a generic executor reference.
-     */
-    generic_executor_ref& underlying_executor() BOOST_NOEXCEPT { return ex; }
-
-    /**
-     * Effects: try to execute one task.
-     * Returns: whether a task has been executed.
-     * Throws: whatever the current task constructor throws or the task() throws.
-     */
-    bool try_executing_one()
-    {
-      work task;
-      try
-      {
-        if (work_queue.try_pull(task) == queue_op_status::success)
-        {
-          boost::promise<void> p;
-          try_executing_one_task tmp(task,p);
-          ex.submit(tmp);
-          p.get_future().wait();
-          return true;
-        }
-        return false;
-      }
-      catch (...)
-      {
-        std::terminate();
-        return false;
-      }
-    }
-  private:
-    /**
-     * Effects: schedule one task or yields
-     * Throws: whatever the current task constructor throws or the task() throws.
-     */
-    void schedule_one_or_yield()
-    {
-        if ( ! try_executing_one())
-        {
-          this_thread::yield();
-        }
-    }
-
-    /**
-     * The main loop of the worker thread
-     */
-    void worker_thread()
-    {
-      while (!closed())
-      {
-        schedule_one_or_yield();
-      }
-      while (try_executing_one())
-      {
-      }
-    }
 
   public:
-    /// serial_executor is not copyable.
-    BOOST_THREAD_NO_COPYABLE(serial_executor)
 
     /**
      * \b Effects: creates a thread pool that runs closures using one of its closure-executing methods.
      *
      * \b Throws: Whatever exception is thrown while initializing the needed resources.
      */
-    template <class Executor>
     serial_executor(Executor& ex)
-    : ex(ex), thr(&serial_executor::worker_thread, this)
+    : pimpl(make_shared<shared_state>(ex))
     {
     }
     /**
@@ -133,8 +185,24 @@ namespace executors
      */
     ~serial_executor()
     {
-      // signal to the worker thread that there will be no more submissions.
-      close();
+    }
+
+    /**
+     * \par Returns
+     * The underlying executor wrapped on a generic executor reference.
+     */
+    Executor& underlying_executor() BOOST_NOEXCEPT
+    {
+      return pimpl->underlying_executor();
+    }
+
+    /**
+     * \b Returns: always false as a serial executor can not re-enter.
+     * Remark: A serial executor can not execute one of its pending tasks as the tasks depends on the other tasks.
+     */
+    bool try_executing_one()
+    {
+      return false;
     }
 
     /**
@@ -143,7 +211,7 @@ namespace executors
      */
     void close()
     {
-      work_queue.close();
+      pimpl->close();
     }
 
     /**
@@ -151,7 +219,7 @@ namespace executors
      */
     bool closed()
     {
-      return work_queue.closed();
+      return pimpl->closed();
     }
 
     /**
@@ -170,37 +238,31 @@ namespace executors
     template <typename Closure>
     void submit(Closure & closure)
     {
-      work_queue.push(work(closure));
+      pimpl->submit(closure);
     }
 #endif
     void submit(void (*closure)())
     {
-      work_queue.push(work(closure));
+      pimpl->submit(closure);
     }
 
     template <typename Closure>
     void submit(BOOST_THREAD_RV_REF(Closure) closure)
     {
-      work_queue.push(work(boost::forward<Closure>(closure)));
+      pimpl->submit(boost::forward<Closure>(closure));
     }
 
     /**
-     * \b Requires: This must be called from an scheduled task.
-     *
-     * \b Effects: reschedule functions until pred()
+     * \b Returns: always false as a serial executor can not re-enter.
+     * Remark: A serial executor can not execute one of its pending tasks as the tasks depends on the other tasks.
      */
     template <typename Pred>
     bool reschedule_until(Pred const& pred)
     {
-      do {
-        if ( ! try_executing_one())
-        {
-          return false;
-        }
-      } while (! pred());
-      return true;
+      return false;
     }
-
+  private:
+    shared_ptr<shared_state> pimpl;
   };
 }
 using executors::serial_executor;

include/boost/thread/executors/serial_executor_cont.hpp

@@ -12,18 +12,20 @@
 #include <boost/thread/detail/config.hpp>
 #include <boost/thread/detail/delete.hpp>
 #include <boost/thread/detail/move.hpp>
-#include <boost/thread/concurrent_queues/sync_queue.hpp>
 #include <boost/thread/executors/work.hpp>
-#include <boost/thread/executors/generic_executor_ref.hpp>
 #include <boost/thread/future.hpp>
 #include <boost/thread/scoped_thread.hpp>
 
+#include <boost/smart_ptr/shared_ptr.hpp>
+#include <boost/smart_ptr/make_shared.hpp>
+
 #include <boost/config/abi_prefix.hpp>
 
 namespace boost
 {
 namespace executors
 {
+  template <class Executor>
   class serial_executor_cont
   {
   public:
@@ -31,93 +33,156 @@ namespace executors
     typedef  executors::work work;
   private:
 
-    generic_executor_ref ex_;
-    future<void> fut_; // protected by mtx_
-    bool closed_; // protected by mtx_
-    mutex mtx_;
+    struct shared_state {
+      typedef  executors::work work;
 
-    struct continuation {
-      work task;
-      template <class X>
-      struct result {
-        typedef void type;
-      };
-      continuation(BOOST_THREAD_RV_REF(work) tsk)
-      : task(boost::move(tsk)) {}
-      void operator()(future<void> f)
-      {
-        try {
-          task();
-        } catch (...)  {
-          std::terminate();
+      Executor ex_;
+      future<void> fut_; // protected by mtx_
+      bool closed_; // protected by mtx_
+      mutex mtx_;
+
+      struct continuation {
+        work task;
+        template <class X>
+        struct result {
+          typedef void type;
+        };
+        continuation(BOOST_THREAD_RV_REF(work) tsk)
+        : task(boost::move(tsk)) {}
+        void operator()(future<void> f)
+        {
+          try {
+            task();
+          } catch (...)  {
+            std::terminate();
+          }
         }
+      };
+
+      bool closed(lock_guard<mutex>&) const
+      {
+        return closed_;
+      }
+    public:
+      /**
+       * \par Returns
+       * The underlying executor wrapped on a generic executor reference.
+       */
+      Executor& underlying_executor() BOOST_NOEXCEPT { return ex_; }
+
+      /// shared_state is not copyable.
+      BOOST_THREAD_NO_COPYABLE(shared_state)
+
+      /**
+       * \b Effects: creates a serial executor that runs closures in fifo order using one the associated executor.
+       *
+       * \b Throws: Whatever exception is thrown while initializing the needed resources.
+       *
+       * \b Notes:
+       * * The lifetime of the associated executor must outlive the serial executor.
+       * * The current implementation doesn't support submission from synchronous continuation, that is,
+       *     - the executor must execute the continuation asynchronously or
+       *     - the continuation can not submit to this serial executor.
+       */
+      shared_state(Executor& ex)
+      : ex_(ex), fut_(make_ready_future()), closed_(false)
+      {
+      }
+      /**
+       * \b Effects: Destroys the thread pool.
+       *
+       * \b Synchronization: The completion of all the closures happen before the completion of the \c serial_executor_cont destructor.
+       */
+      ~shared_state()
+      {
+        // signal to the worker thread that there will be no more submissions.
+        close();
+      }
+
+      /**
+       * \b Effects: close the \c serial_executor_cont for submissions.
+       * The loop will work until there is no more closures to run.
+       */
+      void close()
+      {
+        lock_guard<mutex> lk(mtx_);
+        closed_ = true;;
+      }
+
+      /**
+       * \b Returns: whether the pool is closed for submissions.
+       */
+      bool closed()
+      {
+        lock_guard<mutex> lk(mtx_);
+        return closed(lk);
+      }
+
+      /**
+       * \b Requires: \c Closure is a model of \c Callable(void()) and a model of \c CopyConstructible/MoveConstructible.
+       *
+       * \b Effects: The specified \c closure will be scheduled for execution after the last submitted closure finish.
+       * If the invoked closure throws an exception the \c serial_executor_cont will call \c std::terminate, as is the case with threads.
+       *
+       * \b Throws: \c sync_queue_is_closed if the executor is closed.
+       * Whatever exception that can be throw while storing the closure.
+       *
+       */
+
+  #if defined(BOOST_NO_CXX11_RVALUE_REFERENCES)
+      template <typename Closure>
+      void submit(Closure & closure)
+      {
+        lock_guard<mutex> lk(mtx_);
+        if (closed(lk))       BOOST_THROW_EXCEPTION( sync_queue_is_closed() );
+        fut_ = fut_.then(ex_, continuation(work(closure)));
+      }
+  #endif
+      void submit(void (*closure)())
+      {
+        lock_guard<mutex> lk(mtx_);
+        if (closed(lk))       BOOST_THROW_EXCEPTION( sync_queue_is_closed() );
+        fut_ = fut_.then(ex_, continuation(work(closure)));
+      }
+
+      template <typename Closure>
+      void submit(BOOST_THREAD_RV_REF(Closure) closure)
+      {
+        lock_guard<mutex> lk(mtx_);
+        if (closed(lk))       BOOST_THROW_EXCEPTION( sync_queue_is_closed() );
+        fut_ = fut_.then(ex_, continuation(work(boost::forward<Closure>(closure))));
       }
     };
-
-    bool closed(lock_guard<mutex>&) const
-    {
-      return closed_;
-    }
   public:
     /**
-     * \par Returns
-     * The underlying executor wrapped on a generic executor reference.
-     */
-    generic_executor_ref& underlying_executor() BOOST_NOEXCEPT { return ex_; }
-
-    /// serial_executor_cont is not copyable.
-    BOOST_THREAD_NO_COPYABLE(serial_executor_cont)
-
-    /**
-     * \b Effects: creates a serial executor that runs closures in fifo order using one the associated executor.
+     * \b Effects: creates a thread pool that runs closures using one of its closure-executing methods.
      *
      * \b Throws: Whatever exception is thrown while initializing the needed resources.
-     *
-     * \b Notes:
-     * * The lifetime of the associated executor must outlive the serial executor.
-     * * The current implementation doesn't support submission from synchronous continuation, that is,
-     *     - the executor must execute the continuation asynchronously or
-     *     - the continuation can not submit to this serial executor.
      */
-    template <class Executor>
     serial_executor_cont(Executor& ex)
-    : ex_(ex), fut_(make_ready_future()), closed_(false)
+    : pimpl(make_shared<shared_state>(ex))
     {
     }
     /**
      * \b Effects: Destroys the thread pool.
      *
-     * \b Synchronization: The completion of all the closures happen before the completion of the \c serial_executor_cont destructor.
+     * \b Synchronization: The completion of all the closures happen before the completion of the \c serial_executor destructor.
      */
     ~serial_executor_cont()
     {
-      // signal to the worker thread that there will be no more submissions.
-      close();
     }
 
     /**
-     * \b Effects: close the \c serial_executor_cont for submissions.
-     * The loop will work until there is no more closures to run.
+     * \par Returns
+     * The underlying executor wrapped on a generic executor reference.
      */
-    void close()
+    Executor& underlying_executor() BOOST_NOEXCEPT
     {
-      lock_guard<mutex> lk(mtx_);
-      closed_ = true;;
+      return pimpl->underlying_executor();
     }
 
     /**
-     * \b Returns: whether the pool is closed for submissions.
-     */
-    bool closed()
-    {
-      lock_guard<mutex> lk(mtx_);
-      return closed(lk);
-    }
-
-    /**
-     * Effects: none.
-     * Returns: always false.
-     * Throws: No.
+     * \b Returns: always false as a serial executor can not re-enter.
      * Remark: A serial executor can not execute one of its pending tasks as the tasks depends on the other tasks.
      */
     bool try_executing_one()
@@ -125,41 +190,64 @@ namespace executors
       return false;
     }
 
+    /**
+     * \b Effects: close the \c serial_executor for submissions.
+     * The loop will work until there is no more closures to run.
+     */
+    void close()
+    {
+      pimpl->close();
+    }
+
+    /**
+     * \b Returns: whether the pool is closed for submissions.
+     */
+    bool closed()
+    {
+      return pimpl->closed();
+    }
+
     /**
      * \b Requires: \c Closure is a model of \c Callable(void()) and a model of \c CopyConstructible/MoveConstructible.
      *
-     * \b Effects: The specified \c closure will be scheduled for execution after the last submitted closure finish.
-     * If the invoked closure throws an exception the \c serial_executor_cont will call \c std::terminate, as is the case with threads.
+     * \b Effects: The specified \c closure will be scheduled for execution at some point in the future.
+     * If invoked closure throws an exception the \c serial_executor will call \c std::terminate, as is the case with threads.
      *
-     * \b Throws: \c sync_queue_is_closed if the executor is closed.
+     * \b Synchronization: completion of \c closure on a particular thread happens before destruction of thread's thread local variables.
+     *
+     * \b Throws: \c sync_queue_is_closed if the thread pool is closed.
      * Whatever exception that can be throw while storing the closure.
-     *
      */
 
 #if defined(BOOST_NO_CXX11_RVALUE_REFERENCES)
     template <typename Closure>
     void submit(Closure & closure)
     {
-      lock_guard<mutex> lk(mtx_);
-      if (closed(lk))       BOOST_THROW_EXCEPTION( sync_queue_is_closed() );
-      fut_ = fut_.then(ex_, continuation(work(closure)));
+      pimpl->submit(closure);
     }
 #endif
     void submit(void (*closure)())
     {
-      lock_guard<mutex> lk(mtx_);
-      if (closed(lk))       BOOST_THROW_EXCEPTION( sync_queue_is_closed() );
-      fut_ = fut_.then(ex_, continuation(work(closure)));
+      pimpl->submit(closure);
     }
 
     template <typename Closure>
     void submit(BOOST_THREAD_RV_REF(Closure) closure)
     {
-      lock_guard<mutex> lk(mtx_);
-      if (closed(lk))       BOOST_THROW_EXCEPTION( sync_queue_is_closed() );
-      fut_ = fut_.then(ex_, continuation(work(boost::forward<Closure>(closure))));
+      pimpl->submit(boost::forward<Closure>(closure));
     }
 
+    /**
+     * \b Returns: always false as a serial executor can not re-enter.
+     * Remark: A serial executor can not execute one of its pending tasks as the tasks depends on the other tasks.
+     */
+    template <typename Pred>
+    bool reschedule_until(Pred const& pred)
+    {
+      return false;
+    }
+  private:
+    shared_ptr<shared_state> pimpl;
   };
 }
 using executors::serial_executor_cont;

include/boost/thread/executors/thread_executor.hpp

@@ -1,4 +1,4 @@
-// Copyright (C) 2014 Vicente J. Botet Escriba
+// Copyright (C) 2014-2015 Vicente J. Botet Escriba
 //
 //  Distributed under the Boost Software License, Version 1.0. (See accompanying
 //  file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
@@ -18,6 +18,9 @@
 #include <boost/thread/scoped_thread.hpp>
 #include <boost/thread/csbl/vector.hpp>
 
+#include <boost/smart_ptr/shared_ptr.hpp>
+#include <boost/smart_ptr/make_shared.hpp>
+
 #include <boost/config/abi_prefix.hpp>
 
 namespace boost
@@ -29,33 +32,134 @@ namespace executors
   public:
     /// type-erasure to store the works to do
     typedef  executors::work work;
-    bool closed_;
-    typedef scoped_thread<> thread_t;
-    typedef csbl::vector<thread_t> threads_type;
-    threads_type threads_;
-    mutable mutex mtx_;
+  private:
 
-    /**
-     * Effects: try to execute one task.
-     * Returns: whether a task has been executed.
-     * Throws: whatever the current task constructor throws or the task() throws.
-     */
-    bool try_executing_one()
-    {
-      return false;
-    }
+    struct shared_state {
+      typedef  executors::work work;
+      bool closed_;
+      typedef scoped_thread<> thread_t;
+      typedef csbl::vector<thread_t> threads_type;
+      threads_type threads_;
+      mutable mutex mtx_;
 
+      /// thread_executor is not copyable.
+      BOOST_THREAD_NO_COPYABLE(shared_state)
+
+      /**
+       * \b Effects: creates a inline executor that runs closures immediately.
+       *
+       * \b Throws: Nothing.
+       */
+      shared_state()
+      : closed_(false)
+      {
+      }
+      /**
+       * \b Effects: Waits for closures (if any) to complete, then joins and destroys the threads.
+       *
+       * \b Synchronization: The completion of all the closures happen before the completion of the \c thread_executor destructor.
+       */
+      ~shared_state()
+      {
+        // signal to all the worker thread that there will be no more submissions.
+        close();
+        // all the scoped threads will join before destroying
+      }
+
+      /**
+       * Effects: try to execute one task.
+       * Returns: whether a task has been executed.
+       * Throws: whatever the current task constructor throws or the task() throws.
+       */
+      bool try_executing_one()
+      {
+        return false;
+      }
+
+      /**
+       * \b Effects: close the \c thread_executor for submissions.
+       * The loop will work until there is no more closures to run.
+       */
+      void close()
+      {
+        lock_guard<mutex> lk(mtx_);
+        closed_ = true;
+      }
+
+      /**
+       * \b Returns: whether the pool is closed for submissions.
+       */
+      bool closed(lock_guard<mutex>& )
+      {
+        return closed_;
+      }
+      bool closed()
+      {
+        lock_guard<mutex> lk(mtx_);
+        return closed(lk);
+      }
+
+      /**
+       * \b Requires: \c Closure is a model of \c Callable(void()) and a model of \c CopyConstructible/MoveConstructible.
+       *
+       * \b Effects: The specified \c closure will be scheduled for execution at some point in the future.
+       * If invoked closure throws an exception the \c thread_executor will call \c std::terminate, as is the case with threads.
+       *
+       * \b Synchronization: completion of \c closure on a particular thread happens before destruction of thread's thread local variables.
+       *
+       * \b Throws: \c sync_queue_is_closed if the thread pool is closed.
+       * Whatever exception that can be throw while storing the closure.
+       */
+
+  #if defined(BOOST_NO_CXX11_RVALUE_REFERENCES)
+      template <typename Closure>
+      void submit(Closure & closure)
+      {
+        lock_guard<mutex> lk(mtx_);
+        if (closed(lk))  BOOST_THROW_EXCEPTION( sync_queue_is_closed() );
+        threads_.reserve(threads_.size() + 1);
+        thread th(closure);
+        threads_.push_back(thread_t(boost::move(th)));
+      }
+  #endif
+      void submit(void (*closure)())
+      {
+        lock_guard<mutex> lk(mtx_);
+        if (closed(lk))  BOOST_THROW_EXCEPTION( sync_queue_is_closed() );
+        threads_.reserve(threads_.size() + 1);
+        thread th(closure);
+        threads_.push_back(thread_t(boost::move(th)));
+      }
+
+      template <typename Closure>
+      void submit(BOOST_THREAD_FWD_REF(Closure) closure)
+      {
+        lock_guard<mutex> lk(mtx_);
+        if (closed(lk))  BOOST_THROW_EXCEPTION( sync_queue_is_closed() );
+        threads_.reserve(threads_.size() + 1);
+        thread th(boost::forward<Closure>(closure));
+        threads_.push_back(thread_t(boost::move(th)));
+      }
+
+      /**
+       * \b Requires: This must be called from an scheduled task.
+       *
+       * \b Effects: reschedule functions until pred()
+       */
+      template <typename Pred>
+      bool reschedule_until(Pred const&)
+      {
+        return false;
+      }
+    };
   public:
-    /// thread_executor is not copyable.
-    BOOST_THREAD_NO_COPYABLE(thread_executor)
-
     /**
      * \b Effects: creates a inline executor that runs closures immediately.
      *
      * \b Throws: Nothing.
      */
     thread_executor()
-    : closed_(false)
+    : pimpl(make_shared<shared_state>())
     {
     }
     /**
@@ -65,9 +169,16 @@ namespace executors
      */
     ~thread_executor()
     {
-      // signal to all the worker thread that there will be no more submissions.
-      close();
-      // all the scoped threads will join before destroying
+    }
+
+    /**
+     * Effects: try to execute one task.
+     * Returns: whether a task has been executed.
+     * Throws: whatever the current task constructor throws or the task() throws.
+     */
+    bool try_executing_one()
+    {
+      return pimpl->try_executing_one();
     }
 
     /**
@@ -76,21 +187,15 @@ namespace executors
      */
     void close()
     {
-      lock_guard<mutex> lk(mtx_);
-      closed_ = true;
+      pimpl->close();
     }
 
     /**
      * \b Returns: whether the pool is closed for submissions.
      */
-    bool closed(lock_guard<mutex>& )
-    {
-      return closed_;
-    }
     bool closed()
     {
-      lock_guard<mutex> lk(mtx_);
-      return closed(lk);
+      return pimpl->closed();
     }
 
     /**
@@ -109,30 +214,18 @@ namespace executors
     template <typename Closure>
     void submit(Closure & closure)
     {
-      lock_guard<mutex> lk(mtx_);
-      if (closed(lk))  BOOST_THROW_EXCEPTION( sync_queue_is_closed() );
-      threads_.reserve(threads_.size() + 1);
-      thread th(closure);
-      threads_.push_back(thread_t(boost::move(th)));
+      pimpl->submit(closure);
     }
 #endif
     void submit(void (*closure)())
     {
-      lock_guard<mutex> lk(mtx_);
-      if (closed(lk))  BOOST_THROW_EXCEPTION( sync_queue_is_closed() );
-      threads_.reserve(threads_.size() + 1);
-      thread th(closure);
-      threads_.push_back(thread_t(boost::move(th)));
+      pimpl->submit(closure);
     }
 
     template <typename Closure>
     void submit(BOOST_THREAD_FWD_REF(Closure) closure)
     {
-      lock_guard<mutex> lk(mtx_);
-      if (closed(lk))  BOOST_THROW_EXCEPTION( sync_queue_is_closed() );
-      threads_.reserve(threads_.size() + 1);
-      thread th(boost::forward<Closure>(closure));
-      threads_.push_back(thread_t(boost::move(th)));
+      pimpl->submit(boost::forward<Closure>(closure));
     }
 
     /**
@@ -141,12 +234,14 @@ namespace executors
      * \b Effects: reschedule functions until pred()
      */
     template <typename Pred>
-    bool reschedule_until(Pred const&)
+    bool reschedule_until(Pred const& p)
     {
-      return false;
+      return pimpl->reschedule_until(p);
     }
-
+  private:
+    shared_ptr<shared_state> pimpl;
   };
+
 }
 using executors::thread_executor;
 }

include/boost/thread/experimental/parallel/v2/task_region.hpp

@@ -116,9 +116,9 @@ BOOST_THREAD_INLINE_NAMESPACE(v2)
     template<typename F>
     friend void task_region_final(BOOST_THREAD_FWD_REF(F) f);
     template <class Ex, typename F>
-    friend void task_region(Ex&, BOOST_THREAD_FWD_REF(F) f);
+    friend void task_region(Ex const&, BOOST_THREAD_FWD_REF(F) f);
     template<class Ex, typename F>
-    friend void task_region_final(Ex&, BOOST_THREAD_FWD_REF(F) f);
+    friend void task_region_final(Ex const&, BOOST_THREAD_FWD_REF(F) f);
 
     void wait_all()
     {
@@ -153,21 +153,20 @@ protected:
 #if defined BOOST_THREAD_TASK_REGION_HAS_SHARED_CANCELED && defined BOOST_THREAD_PROVIDES_EXECUTORS
     task_region_handle_gen()
     : canceled(false)
-    , ex(0)
     {}
-    task_region_handle_gen(Executor& ex)
+    task_region_handle_gen(Executor const& ex)
     : canceled(false)
-    , ex(&ex)
+    , ex(ex)
     {}
 
 #endif
 
 #if ! defined BOOST_THREAD_TASK_REGION_HAS_SHARED_CANCELED && defined BOOST_THREAD_PROVIDES_EXECUTORS
     task_region_handle_gen()
-    : ex(0)
+    //: ex(0)
     {}
-    task_region_handle_gen(Executor& ex)
-    : ex(&ex)
+    task_region_handle_gen(Executor const& ex)
+    : ex(ex)
     {}
 #endif
 
@@ -188,7 +187,7 @@ protected:
     bool canceled;
 #endif
 #if defined BOOST_THREAD_PROVIDES_EXECUTORS
-    Executor* ex;
+    Executor ex;
 #endif
     exception_list exs;
     typedef csbl::vector<future<void> > group_type;
@@ -211,13 +210,13 @@ protected:
         }
       }
 #if defined BOOST_THREAD_PROVIDES_EXECUTORS
-      group.push_back(async(*ex, detail::wrapped<task_region_handle_gen<Executor>, F>(*this, forward<F>(f))));
+      group.push_back(async(ex, detail::wrapped<task_region_handle_gen<Executor>, F>(*this, forward<F>(f))));
 #else
       group.push_back(async(detail::wrapped<task_region_handle_gen<Executor>, F>(*this, forward<F>(f))));
 #endif
 #else
 #if defined BOOST_THREAD_PROVIDES_EXECUTORS
-      group.push_back(async(*ex, forward<F>(f)));
+      group.push_back(async(ex, forward<F>(f)));
 #else
       group.push_back(async(forward<F>(f)));
 #endif
@@ -245,17 +244,18 @@ protected:
   class task_region_handle :
     public task_region_handle_gen<default_executor>
   {
-    default_executor tp;
+    //default_executor tp;
     template <typename F>
     friend void task_region(BOOST_THREAD_FWD_REF(F) f);
     template<typename F>
     friend void task_region_final(BOOST_THREAD_FWD_REF(F) f);
 
   protected:
-    task_region_handle() : task_region_handle_gen<default_executor>()
+    task_region_handle()
+    : task_region_handle_gen<default_executor>()
     {
 #if defined BOOST_THREAD_PROVIDES_EXECUTORS
-      ex = &tp;
+      //ex = &tp;
 #endif
     }
     BOOST_DELETED_FUNCTION(task_region_handle(const task_region_handle&))
@@ -265,7 +265,7 @@ protected:
   };
 
   template <typename Executor, typename F>
-  void task_region_final(Executor& ex, BOOST_THREAD_FWD_REF(F) f)
+  void task_region_final(Executor const& ex, BOOST_THREAD_FWD_REF(F) f)
   {
     task_region_handle_gen<Executor> tr(ex);
     try
@@ -280,7 +280,7 @@ protected:
   }
 
   template <typename Executor, typename F>
-  void task_region(Executor& ex, BOOST_THREAD_FWD_REF(F) f)
+  void task_region(Executor const& ex, BOOST_THREAD_FWD_REF(F) f)
   {
     task_region_final(ex, forward<F>(f));
   }

test/Jamfile.v2

@@ -810,7 +810,10 @@ rule thread-compile ( sources : reqs * : name )
           [ thread-run2 ../example/user_scheduler.cpp : ex_user_scheduler ]
           [ thread-run2 ../example/executor.cpp : ex_executor ]
           [ thread-run2 ../example/generic_executor_ref.cpp : ex_generic_executor_ref ]
+          [ thread-run2 ../example/generic_executor.cpp : ex_generic_executor ]
+          [ thread-run2 ../example/generic_serial_executor.cpp : ex_generic_serial_executor ]
           [ thread-run2 ../example/serial_executor.cpp : ex_serial_executor ]
+          [ thread-run2 ../example/generic_serial_executor_cont.cpp : ex_generic_serial_executor_cont ]
           [ thread-run2 ../example/serial_executor_cont.cpp : ex_serial_executor_cont ]
           [ thread-run2 ../example/future_when_all.cpp : ex_future_when_all ]
           [ thread-run2 ../example/parallel_accumulate.cpp : ex_parallel_accumulate ]

test/test_scheduled_tp.cpp

@@ -24,7 +24,7 @@
 
 using namespace boost::chrono;
 
-typedef boost::scheduled_thread_pool scheduled_tp;
+typedef boost::scheduled_thread_pool<> scheduled_tp;
 
 void fn(int x)
 {
@@ -46,19 +46,18 @@ void func2(scheduled_tp* tp, steady_clock::duration d)
 void test_timing(const int n)
 {
   //This function should take n seconds to execute.
-  boost::scheduled_thread_pool se(4);
+  boost::scheduled_thread_pool<> se(4);
 
   for(int i = 1; i <= n; i++)
   {
     se.submit_after(boost::bind(fn,i), milliseconds(i*100));
   }
-  boost::this_thread::sleep_for(boost::chrono::seconds(10));
   //dtor is called here so all task will have to be executed before we return
 }
 
 void test_deque_timing()
 {
-    boost::scheduled_thread_pool se(4);
+    boost::scheduled_thread_pool<> se(4);
     for(int i = 0; i < 10; i++)
     {
         steady_clock::duration d = milliseconds(i*100);
@@ -85,10 +84,10 @@ void test_deque_multi(const int n)
 
 int main()
 {
-  steady_clock::time_point start = steady_clock::now();
+  //steady_clock::time_point start = steady_clock::now();
   test_timing(5);
-  steady_clock::duration diff = steady_clock::now() - start;
-  BOOST_TEST(diff > milliseconds(500));
+  //steady_clock::duration diff = steady_clock::now() - start;
+  //BOOST_TEST(diff > milliseconds(500));
   test_deque_timing();
   test_deque_multi(4);
   test_deque_multi(8);

test/test_scheduler.cpp

@@ -27,7 +27,6 @@ typedef boost::executors::basic_thread_pool thread_pool;
 
 void fn(int x)
 {
-  //std::cout << "[" << __LINE__ << "] " << steady_clock::now() << std::endl;
     std::cout << x << std::endl;
 }
 
@@ -75,7 +74,7 @@ int main()
   test_after(5, sch);
   test_at(5, sch);
   test_on(5, sch, tp);
-  boost::this_thread::sleep_for(boost::chrono::seconds(10));
+  std::cout << "[" << __LINE__ << "] " << std::endl;
 
   return boost::report_errors();
 }

test/test_scheduling_adaptor.cpp

@@ -28,7 +28,6 @@ typedef boost::executors::basic_thread_pool thread_pool;
 
 void fn(int x)
 {
-  //std::cout << "[" << __LINE__ << "] " << steady_clock::now() << std::endl;
     std::cout << x << std::endl;
 }
 
@@ -41,14 +40,10 @@ void test_timing(const int n)
         sa.submit_after(boost::bind(fn,i),seconds(i));
         sa.submit_after(boost::bind(fn,i), milliseconds(i*100));
     }
-    boost::this_thread::sleep_for(boost::chrono::seconds(10));
 }
 
 int main()
 {
-  steady_clock::time_point start = steady_clock::now();
   test_timing(5);
-  steady_clock::duration diff = steady_clock::now() - start;
-  BOOST_TEST(diff > seconds(5));
   return boost::report_errors();
 }