coroutine: initial commit

[SVN r81769]

performance/simple_stack_allocator.hpp

@@ -0,0 +1,67 @@
+
+//          Copyright Oliver Kowalke 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)
+
+#ifndef BOOST_CONTEXT_SIMPLE_STACK_ALLOCATOR_H
+#define BOOST_CONTEXT_SIMPLE_STACK_ALLOCATOR_H
+
+#include <cstddef>
+#include <cstdlib>
+#include <stdexcept>
+
+#include <boost/assert.hpp>
+#include <boost/config.hpp>
+
+#include <boost/context/detail/config.hpp>
+
+#ifdef BOOST_HAS_ABI_HEADERS
+#  include BOOST_ABI_PREFIX
+#endif
+
+namespace boost {
+namespace context {
+
+template< std::size_t Max, std::size_t Default, std::size_t Min >
+class simple_stack_allocator
+{
+public:
+    static std::size_t maximum_stacksize()
+    { return Max; }
+
+    static std::size_t default_stacksize()
+    { return Default; }
+
+    static std::size_t minimum_stacksize()
+    { return Min; }
+
+    void * allocate( std::size_t size) const
+    {
+        BOOST_ASSERT( minimum_stacksize() <= size);
+        BOOST_ASSERT( maximum_stacksize() >= size);
+
+        void * limit = std::calloc( size, sizeof( char) );
+        if ( ! limit) throw std::bad_alloc();
+
+        return static_cast< char * >( limit) + size;
+    }
+
+    void deallocate( void * vp, std::size_t size) const
+    {
+        BOOST_ASSERT( vp);
+        BOOST_ASSERT( minimum_stacksize() <= size);
+        BOOST_ASSERT( maximum_stacksize() >= size);
+
+        void * limit = static_cast< char * >( vp) - size;
+        std::free( limit);
+    }
+};
+
+}}
+
+#ifdef BOOST_HAS_ABI_HEADERS
+#  include BOOST_ABI_SUFFIX
+#endif
+
+#endif // BOOST_CONTEXT_SIMPLE_STACK_ALLOCATOR_H