977ed18d
 Hu Chunming
提交三方库
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// Copyright Oliver Kowalke 2017.
// 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)
#if defined(BOOST_USE_UCONTEXT)
#include "boost/context/fiber_ucontext.hpp"
#elif defined(BOOST_USE_WINFIB)
#include "boost/context/fiber_winfib.hpp"
#endif
#include <boost/config.hpp>
#ifdef BOOST_HAS_ABI_HEADERS
# include BOOST_ABI_PREFIX
#endif
namespace boost {
namespace context {
namespace detail {
// zero-initialization
thread_local fiber_activation_record * fib_current_rec;
thread_local static std::size_t counter;
// schwarz counter
fiber_activation_record_initializer::fiber_activation_record_initializer() noexcept {
if ( 0 == counter++) {
fib_current_rec = new fiber_activation_record();
}
}
fiber_activation_record_initializer::~fiber_activation_record_initializer() {
if ( 0 == --counter) {
BOOST_ASSERT( fib_current_rec->is_main_context() );
delete fib_current_rec;
}
}
}
namespace detail {
fiber_activation_record *&
fiber_activation_record::current() noexcept {
// initialized the first time control passes; per thread
thread_local static fiber_activation_record_initializer initializer;
return fib_current_rec;
}
}
}}
#ifdef BOOST_HAS_ABI_HEADERS
# include BOOST_ABI_SUFFIX
#endif
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