Merge from trunk for 1.46

[SVN r68072]

example/doc_xsi_shared_memory.cpp

@@ -0,0 +1,95 @@
+//////////////////////////////////////////////////////////////////////////////
+//
+// (C) Copyright Ion Gaztanaga 2006-2009. 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)
+//
+// See http://www.boost.org/libs/interprocess for documentation.
+//
+//////////////////////////////////////////////////////////////////////////////
+#include <boost/interprocess/detail/config_begin.hpp>
+#include <boost/interprocess/detail/workaround.hpp>
+
+#if defined(BOOST_INTERPROCESS_XSI_SHARED_MEMORY_OBJECTS) || defined(BOOST_INTERPROCESS_DOXYGEN_INVOKED)
+
+//[doc_xsi_shared_memory
+#include <boost/interprocess/xsi_shared_memory.hpp>
+#include <boost/interprocess/mapped_region.hpp>
+#include <cstring>
+#include <cstdlib>
+#include <string>
+
+using namespace boost::interprocess;
+
+void remove_old_shared_memory(const xsi_key &key)
+{
+   try{
+      xsi_shared_memory xsi(open_only, key);
+      xsi_shared_memory::remove(xsi.get_shmid());
+   }
+   catch(interprocess_exception &e){
+      if(e.get_error_code() != not_found_error)
+         throw;
+   }
+}
+
+int main(int argc, char *argv[])
+{
+   if(argc == 1){  //Parent process
+      //Build XSI key (ftok based)
+      xsi_key key(argv[0], 1);
+
+      remove_old_shared_memory(key);
+
+      //Create a shared memory object.
+      xsi_shared_memory shm (create_only, key, 1000);
+
+      //Remove shared memory on destruction
+      struct shm_remove 
+      {
+         int shmid_;
+         shm_remove(int shmid) : shmid_(shmid){}
+         ~shm_remove(){ xsi_shared_memory::remove(shmid_); }
+      } remover(shm.get_shmid());
+
+      //Map the whole shared memory in this process
+      mapped_region region(shm, read_write);
+
+      //Write all the memory to 1
+      std::memset(region.get_address(), 1, region.get_size());
+
+      //Launch child process
+      std::string s(argv[0]); s += " child ";
+      if(0 != std::system(s.c_str()))
+         return 1;
+   }
+   else{
+      //Build XSI key (ftok based)
+      xsi_key key(argv[0], 1);
+
+      //Create a shared memory object.
+      xsi_shared_memory shm (open_only, key);
+
+      //Map the whole shared memory in this process
+      mapped_region region(shm, read_only);
+
+      //Check that memory was initialized to 1
+      char *mem = static_cast<char*>(region.get_address());
+      for(std::size_t i = 0; i < region.get_size(); ++i)
+         if(*mem++ != 1)
+            return 1;   //Error checking memory
+   }
+   return 0;
+}
+//]
+
+#else //BOOST_INTERPROCESS_XSI_SHARED_MEMORY_OBJECTS
+
+int main()
+{
+   return 0;
+}
+
+#endif //BOOST_INTERPROCESS_XSI_SHARED_MEMORY_OBJECTS
+
+#include <boost/interprocess/detail/config_end.hpp>