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85 lines
2.3 KiB
C++
85 lines
2.3 KiB
C++
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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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#if defined(BOOST_USE_UCONTEXT)
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#include "boost/context/continuation_ucontext.hpp"
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#else
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#include "boost/context/execution_context.hpp"
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#endif
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#include <boost/config.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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#if defined(BOOST_USE_UCONTEXT) || (defined(BOOST_EXECUTION_CONTEXT) && (BOOST_EXECUTION_CONTEXT == 1))
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namespace boost {
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namespace context {
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namespace detail {
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thread_local
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#if defined(BOOST_USE_UCONTEXT)
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activation_record *
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#elif defined(BOOST_EXECUTION_CONTEXT) && (BOOST_EXECUTION_CONTEXT == 1)
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activation_record::ptr_t
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#endif
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activation_record::current_rec;
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// zero-initialization
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thread_local static std::size_t counter;
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// schwarz counter
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activation_record_initializer::activation_record_initializer() noexcept {
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if ( 0 == counter++) {
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#if defined(BOOST_USE_UCONTEXT)
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activation_record::current_rec = new activation_record();
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#elif defined(BOOST_EXECUTION_CONTEXT) && (BOOST_EXECUTION_CONTEXT == 1)
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activation_record::current_rec.reset( new activation_record() );
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#endif
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}
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}
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activation_record_initializer::~activation_record_initializer() {
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if ( 0 == --counter) {
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BOOST_ASSERT( activation_record::current_rec->is_main_context() );
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#if defined(BOOST_USE_UCONTEXT)
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delete activation_record::current_rec;
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#elif defined(BOOST_EXECUTION_CONTEXT) && (BOOST_EXECUTION_CONTEXT == 1)
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delete activation_record::current_rec.detach();
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#endif
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}
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}
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}
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#if defined(BOOST_USE_UCONTEXT)
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namespace detail {
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activation_record *&
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activation_record::current() noexcept {
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// initialized the first time control passes; per thread
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thread_local static activation_record_initializer initializer;
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return activation_record::current_rec;
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}
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}
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#elif defined(BOOST_EXECUTION_CONTEXT) && (BOOST_EXECUTION_CONTEXT == 1)
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execution_context
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execution_context::current() noexcept {
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// initialized the first time control passes; per thread
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thread_local static detail::activation_record_initializer initializer;
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return execution_context();
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}
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#endif
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}}
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#endif
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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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