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// Copyright Oliver Kowalke 2009.
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// Distributed under the Boost Software License, Version 1.0.
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// (See accompanying file LICENSE_1_0.txt or copy at
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// http://www.boost.org/LICENSE_1_0.txt)
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#ifndef BOOST_COROUTINES_SEGMENTED_STACK_ALLOCATOR_H
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#define BOOST_COROUTINES_SEGMENTED_STACK_ALLOCATOR_H
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#include <cstddef>
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#include <new>
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#include <boost/config.hpp>
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#include <boost/coroutine/detail/config.hpp>
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#include <boost/coroutine/stack_context.hpp>
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#include <boost/coroutine/stack_traits.hpp>
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#ifdef BOOST_HAS_ABI_HEADERS
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# include BOOST_ABI_PREFIX
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#endif
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// forward declaration for splitstack-functions defined in libgcc
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extern "C" {
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void *__splitstack_makecontext( std::size_t,
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void * [BOOST_CONTEXT_SEGMENTS],
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std::size_t *);
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void __splitstack_releasecontext( void * [BOOST_CONTEXT_SEGMENTS]);
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void __splitstack_resetcontext( void * [BOOST_CONTEXT_SEGMENTS]);
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void __splitstack_block_signals_context( void * [BOOST_CONTEXT_SEGMENTS],
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int * new_value, int * old_value);
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}
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namespace boost {
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namespace coroutines {
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template< typename traitsT >
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struct basic_segmented_stack_allocator
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{
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typedef traitsT traits_type;
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void allocate( stack_context & ctx, std::size_t size = traits_type::minimum_size() )
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{
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void * limit = __splitstack_makecontext( size, ctx.segments_ctx, & ctx.size);
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if ( ! limit) throw std::bad_alloc();
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// ctx.size is already filled by __splitstack_makecontext
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ctx.sp = static_cast< char * >( limit) + ctx.size;
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int off = 0;
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__splitstack_block_signals_context( ctx.segments_ctx, & off, 0);
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}
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void deallocate( stack_context & ctx)
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{ __splitstack_releasecontext( ctx.segments_ctx); }
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};
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typedef basic_segmented_stack_allocator< stack_traits > segmented_stack_allocator;
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}}
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#ifdef BOOST_HAS_ABI_HEADERS
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# include BOOST_ABI_SUFFIX
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#endif
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#endif // BOOST_COROUTINES_SEGMENTED_STACK_ALLOCATOR_H
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