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// 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_COROUTINES_STANDARD_STACK_ALLOCATOR_H
#define BOOST_COROUTINES_STANDARD_STACK_ALLOCATOR_H
#include <cstddef>
#include <cstdlib>
#include <new>
#include <boost/assert.hpp>
#include <boost/config.hpp>
#include <boost/coroutine/detail/config.hpp>
#include <boost/coroutine/stack_context.hpp>
#include <boost/coroutine/stack_traits.hpp>
#ifdef BOOST_HAS_ABI_HEADERS
# include BOOST_ABI_PREFIX
#endif
namespace boost {
namespace coroutines {
template< typename traitsT >
struct basic_standard_stack_allocator
{
typedef traitsT traits_type;
void allocate( stack_context & ctx, std::size_t size = traits_type::minimum_size() )
{
BOOST_ASSERT( traits_type::minimum_size() <= size);
BOOST_ASSERT( traits_type::is_unbounded() || ( traits_type::maximum_size() >= size) );
void * limit = std::malloc( size);
if ( ! limit) throw std::bad_alloc();
ctx.size = size;
ctx.sp = static_cast< char * >( limit) + ctx.size;
}
void deallocate( stack_context & ctx)
{
BOOST_ASSERT( ctx.sp);
BOOST_ASSERT( traits_type::minimum_size() <= ctx.size);
BOOST_ASSERT( traits_type::is_unbounded() || ( traits_type::maximum_size() >= ctx.size) );
void * limit = static_cast< char * >( ctx.sp) - ctx.size;
std::free( limit);
}
};
typedef basic_standard_stack_allocator< stack_traits > standard_stack_allocator;
}}
#ifdef BOOST_HAS_ABI_HEADERS
# include BOOST_ABI_SUFFIX
#endif
#endif // BOOST_COROUTINES_STANDARD_STACK_ALLOCATOR_H
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