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ROBLOX2016
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Library/boost/libs/context/src/fiber.cpp
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19 дек 2024, 19:11
19 дек 2024, 19:11
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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