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// std::this_thread::sleep_for/until declarations -*- C++ -*- |
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// Copyright (C) 2008-2021 Free Software Foundation, Inc. |
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// |
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// This file is part of the GNU ISO C++ Library. This library is free |
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// software; you can redistribute it and/or modify it under the |
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// terms of the GNU General Public License as published by the |
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// Free Software Foundation; either version 3, or (at your option) |
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// any later version. |
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|
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// This library is distributed in the hope that it will be useful, |
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// but WITHOUT ANY WARRANTY; without even the implied warranty of |
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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// GNU General Public License for more details. |
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|
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// Under Section 7 of GPL version 3, you are granted additional |
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// permissions described in the GCC Runtime Library Exception, version |
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// 3.1, as published by the Free Software Foundation. |
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|
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// You should have received a copy of the GNU General Public License and |
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// a copy of the GCC Runtime Library Exception along with this program; |
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// see the files COPYING3 and COPYING.RUNTIME respectively. If not, see |
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// <http://www.gnu.org/licenses/>. |
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|
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/** @file bits/std_thread_sleep.h |
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* This is an internal header file, included by other library headers. |
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* Do not attempt to use it directly. @headername{thread} |
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*/ |
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|
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#ifndef _GLIBCXX_THIS_THREAD_SLEEP_H |
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#define _GLIBCXX_THIS_THREAD_SLEEP_H 1 |
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|
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#pragma GCC system_header |
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|
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#if __cplusplus >= 201103L |
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#include <bits/c++config.h> |
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|
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#include <chrono> // std::chrono::* |
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|
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#ifdef _GLIBCXX_USE_NANOSLEEP |
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# include <cerrno> // errno, EINTR |
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# include <time.h> // nanosleep |
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#endif |
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|
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namespace std _GLIBCXX_VISIBILITY(default) |
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{ |
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_GLIBCXX_BEGIN_NAMESPACE_VERSION |
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|
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/** @addtogroup threads |
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* @{ |
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*/ |
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|
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/** @namespace std::this_thread |
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* @brief ISO C++ 2011 namespace for interacting with the current thread |
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* |
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* C++11 30.3.2 [thread.thread.this] Namespace this_thread. |
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*/ |
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namespace this_thread |
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{ |
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#ifndef _GLIBCXX_NO_SLEEP |
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|
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#ifndef _GLIBCXX_USE_NANOSLEEP |
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void |
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__sleep_for(chrono::seconds, chrono::nanoseconds); |
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#endif |
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|
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/// this_thread::sleep_for |
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template<typename _Rep, typename _Period> |
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inline void |
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sleep_for(const chrono::duration<_Rep, _Period>& __rtime) |
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{ |
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if (__rtime <= __rtime.zero()) |
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return; |
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auto __s = chrono::duration_cast<chrono::seconds>(__rtime); |
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auto __ns = chrono::duration_cast<chrono::nanoseconds>(__rtime - __s); |
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#ifdef _GLIBCXX_USE_NANOSLEEP |
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struct ::timespec __ts = |
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{ |
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static_cast<std::time_t>(__s.count()), |
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static_cast<long>(__ns.count()) |
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}; |
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while (::nanosleep(&__ts, &__ts) == -1 && errno == EINTR) |
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{ } |
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#else |
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__sleep_for(__s, __ns); |
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#endif |
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} |
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|
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/// this_thread::sleep_until |
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template<typename _Clock, typename _Duration> |
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inline void |
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sleep_until(const chrono::time_point<_Clock, _Duration>& __atime) |
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{ |
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#if __cplusplus > 201703L |
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static_assert(chrono::is_clock_v<_Clock>); |
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#endif |
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auto __now = _Clock::now(); |
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if (_Clock::is_steady) |
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{ |
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if (__now < __atime) |
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sleep_for(__atime - __now); |
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return; |
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} |
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while (__now < __atime) |
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{ |
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sleep_for(__atime - __now); |
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__now = _Clock::now(); |
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} |
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} |
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} // namespace this_thread |
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#endif // ! NO_SLEEP |
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|
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/// @} |
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|
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_GLIBCXX_END_NAMESPACE_VERSION |
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} // namespace |
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#endif // C++11 |
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|
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#endif // _GLIBCXX_THIS_THREAD_SLEEP_H |
