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// Copyright Oliver Kowalke 2014.
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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_CONTEXT_SEGMENTED_H
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#define BOOST_CONTEXT_SEGMENTED_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/context/detail/config.hpp>
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#include <boost/context/stack_context.hpp>
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#include <boost/context/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 context {
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template< typename traitsT >
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class basic_segmented_stack {
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private:
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std::size_t size_;
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public:
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typedef traitsT traits_type;
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basic_segmented_stack( std::size_t size = traits_type::default_size() ) BOOST_NOEXCEPT_OR_NOTHROW :
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size_( size) {
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}
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stack_context allocate() {
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stack_context sctx;
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void * vp = __splitstack_makecontext( size_, sctx.segments_ctx, & sctx.size);
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if ( ! vp) throw std::bad_alloc();
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// sctx.size is already filled by __splitstack_makecontext
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sctx.sp = static_cast< char * >( vp) + sctx.size;
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int off = 0;
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__splitstack_block_signals_context( sctx.segments_ctx, & off, 0);
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return sctx;
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}
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void deallocate( stack_context & sctx) BOOST_NOEXCEPT_OR_NOTHROW {
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__splitstack_releasecontext( sctx.segments_ctx);
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}
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};
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typedef basic_segmented_stack< stack_traits > segmented_stack;
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# if defined(BOOST_USE_SEGMENTED_STACKS)
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typedef segmented_stack default_stack;
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# endif
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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_CONTEXT_SEGMENTED_H
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