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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_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_CONTEXT_SEGMENTS],
- std::size_t *);
- void __splitstack_releasecontext( void * [BOOST_CONTEXT_SEGMENTS]);
- void __splitstack_resetcontext( void * [BOOST_CONTEXT_SEGMENTS]);
- void __splitstack_block_signals_context( void * [BOOST_CONTEXT_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
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