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59 lines
1.3 KiB
C++
59 lines
1.3 KiB
C++
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// Copyright Oliver Kowalke 2017.
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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/fiber_ucontext.hpp"
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#elif defined(BOOST_USE_WINFIB)
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#include "boost/context/fiber_winfib.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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namespace boost {
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namespace context {
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namespace detail {
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// zero-initialization
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thread_local fiber_activation_record * fib_current_rec;
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thread_local static std::size_t counter;
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// schwarz counter
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fiber_activation_record_initializer::fiber_activation_record_initializer() noexcept {
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if ( 0 == counter++) {
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fib_current_rec = new fiber_activation_record();
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}
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}
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fiber_activation_record_initializer::~fiber_activation_record_initializer() {
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if ( 0 == --counter) {
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BOOST_ASSERT( fib_current_rec->is_main_context() );
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delete fib_current_rec;
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}
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}
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}
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namespace detail {
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fiber_activation_record *&
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fiber_activation_record::current() noexcept {
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// initialized the first time control passes; per thread
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thread_local static fiber_activation_record_initializer initializer;
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return fib_current_rec;
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}
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}
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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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