mirror of
https://github.com/boostorg/context.git
synced 2026-01-19 04:02:17 +00:00
59 lines
1.3 KiB
C++
59 lines
1.3 KiB
C++
|
|
// 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/continuation_ucontext.hpp"
|
|
#elif defined(BOOST_USE_WINFIB)
|
|
#include "boost/context/continuation_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 activation_record * current_rec;
|
|
thread_local static std::size_t counter;
|
|
|
|
// schwarz counter
|
|
activation_record_initializer::activation_record_initializer() noexcept {
|
|
if ( 0 == counter++) {
|
|
current_rec = new activation_record();
|
|
}
|
|
}
|
|
|
|
activation_record_initializer::~activation_record_initializer() {
|
|
if ( 0 == --counter) {
|
|
BOOST_ASSERT( current_rec->is_main_context() );
|
|
delete current_rec;
|
|
}
|
|
}
|
|
|
|
}
|
|
|
|
namespace detail {
|
|
|
|
activation_record *&
|
|
activation_record::current() noexcept {
|
|
// initialized the first time control passes; per thread
|
|
thread_local static activation_record_initializer initializer;
|
|
return current_rec;
|
|
}
|
|
|
|
}
|
|
|
|
}}
|
|
|
|
#ifdef BOOST_HAS_ABI_HEADERS
|
|
# include BOOST_ABI_SUFFIX
|
|
#endif
|