| |
| // 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_SEGMENTED_STACK_ALLOCATOR_H |
| #define BOOST_COROUTINES_SEGMENTED_STACK_ALLOCATOR_H |
| |
| #include <cstddef> |
| #include <new> |
| |
| #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 |
| |
| // forward declaration for splitstack-functions defined in libgcc |
| extern "C" { |
| void *__splitstack_makecontext( std::size_t, |
| void * [BOOST_COROUTINES_SEGMENTS], |
| std::size_t *); |
| |
| void __splitstack_releasecontext( void * [BOOST_COROUTINES_SEGMENTS]); |
| |
| void __splitstack_resetcontext( void * [BOOST_COROUTINES_SEGMENTS]); |
| |
| void __splitstack_block_signals_context( void * [BOOST_COROUTINES_SEGMENTS], |
| int * new_value, int * old_value); |
| } |
| |
| namespace boost { |
| namespace coroutines { |
| |
| template< typename traitsT > |
| struct basic_segmented_stack_allocator |
| { |
| typedef traitsT traits_type; |
| |
| void allocate( stack_context & ctx, std::size_t size = traits_type::minimum_size() ) |
| { |
| void * limit = __splitstack_makecontext( size, ctx.segments_ctx, & ctx.size); |
| if ( ! limit) throw std::bad_alloc(); |
| |
| // ctx.size is already filled by __splitstack_makecontext |
| ctx.sp = static_cast< char * >( limit) + ctx.size; |
| |
| int off = 0; |
| __splitstack_block_signals_context( ctx.segments_ctx, & off, 0); |
| } |
| |
| void deallocate( stack_context & ctx) |
| { __splitstack_releasecontext( ctx.segments_ctx); } |
| }; |
| |
| typedef basic_segmented_stack_allocator< stack_traits > segmented_stack_allocator; |
| |
| }} |
| |
| #ifdef BOOST_HAS_ABI_HEADERS |
| # include BOOST_ABI_SUFFIX |
| #endif |
| |
| #endif // BOOST_COROUTINES_SEGMENTED_STACK_ALLOCATOR_H |