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Diffstat (limited to 'boost/coroutine/standard_stack_allocator.hpp')
-rw-r--r-- | boost/coroutine/standard_stack_allocator.hpp | 75 |
1 files changed, 75 insertions, 0 deletions
diff --git a/boost/coroutine/standard_stack_allocator.hpp b/boost/coroutine/standard_stack_allocator.hpp new file mode 100644 index 0000000000..b946fffc4a --- /dev/null +++ b/boost/coroutine/standard_stack_allocator.hpp @@ -0,0 +1,75 @@ + +// 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 + +#if defined(BOOST_USE_VALGRIND) +#include <valgrind/valgrind.h> +#endif + +#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; +#if defined(BOOST_USE_VALGRIND) + ctx.valgrind_stack_id = VALGRIND_STACK_REGISTER( ctx.sp, limit); +#endif + } + + 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) ); + +#if defined(BOOST_USE_VALGRIND) + VALGRIND_STACK_DEREGISTER( ctx.valgrind_stack_id); +#endif + + 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 |