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- // std::this_thread::sleep_for/until declarations -*- C++ -*-
- // Copyright (C) 2008-2022 Free Software Foundation, Inc.
- //
- // This file is part of the GNU ISO C++ Library. This library is free
- // software; you can redistribute it and/or modify it under the
- // terms of the GNU General Public License as published by the
- // Free Software Foundation; either version 3, or (at your option)
- // any later version.
- // This library is distributed in the hope that it will be useful,
- // but WITHOUT ANY WARRANTY; without even the implied warranty of
- // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- // GNU General Public License for more details.
- // Under Section 7 of GPL version 3, you are granted additional
- // permissions described in the GCC Runtime Library Exception, version
- // 3.1, as published by the Free Software Foundation.
- // You should have received a copy of the GNU General Public License and
- // a copy of the GCC Runtime Library Exception along with this program;
- // see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
- // <http://www.gnu.org/licenses/>.
- /** @file bits/this_thread_sleep.h
- * This is an internal header file, included by other library headers.
- * Do not attempt to use it directly. @headername{thread}
- */
- #ifndef _GLIBCXX_THIS_THREAD_SLEEP_H
- #define _GLIBCXX_THIS_THREAD_SLEEP_H 1
- #pragma GCC system_header
- #if __cplusplus >= 201103L
- #include <bits/chrono.h> // std::chrono::*
- #ifdef _GLIBCXX_USE_NANOSLEEP
- # include <cerrno> // errno, EINTR
- # include <time.h> // nanosleep
- #endif
- namespace std _GLIBCXX_VISIBILITY(default)
- {
- _GLIBCXX_BEGIN_NAMESPACE_VERSION
- /** @addtogroup threads
- * @{
- */
- /** @namespace std::this_thread
- * @brief ISO C++ 2011 namespace for interacting with the current thread
- *
- * C++11 30.3.2 [thread.thread.this] Namespace this_thread.
- */
- namespace this_thread
- {
- #ifndef _GLIBCXX_NO_SLEEP
- #ifndef _GLIBCXX_USE_NANOSLEEP
- void
- __sleep_for(chrono::seconds, chrono::nanoseconds);
- #endif
- /// this_thread::sleep_for
- template<typename _Rep, typename _Period>
- inline void
- sleep_for(const chrono::duration<_Rep, _Period>& __rtime)
- {
- if (__rtime <= __rtime.zero())
- return;
- auto __s = chrono::duration_cast<chrono::seconds>(__rtime);
- auto __ns = chrono::duration_cast<chrono::nanoseconds>(__rtime - __s);
- #ifdef _GLIBCXX_USE_NANOSLEEP
- struct ::timespec __ts =
- {
- static_cast<std::time_t>(__s.count()),
- static_cast<long>(__ns.count())
- };
- while (::nanosleep(&__ts, &__ts) == -1 && errno == EINTR)
- { }
- #else
- __sleep_for(__s, __ns);
- #endif
- }
- /// this_thread::sleep_until
- template<typename _Clock, typename _Duration>
- inline void
- sleep_until(const chrono::time_point<_Clock, _Duration>& __atime)
- {
- #if __cplusplus > 201703L
- static_assert(chrono::is_clock_v<_Clock>);
- #endif
- auto __now = _Clock::now();
- if (_Clock::is_steady)
- {
- if (__now < __atime)
- sleep_for(__atime - __now);
- return;
- }
- while (__now < __atime)
- {
- sleep_for(__atime - __now);
- __now = _Clock::now();
- }
- }
- #endif // ! NO_SLEEP
- } // namespace this_thread
- /// @}
- _GLIBCXX_END_NAMESPACE_VERSION
- } // namespace
- #endif // C++11
- #endif // _GLIBCXX_THIS_THREAD_SLEEP_H
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