1cea42859SHui // -*- C++ -*- 2cea42859SHui //===----------------------------------------------------------------------===// 3cea42859SHui // 4cea42859SHui // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 5cea42859SHui // See https://llvm.org/LICENSE.txt for license information. 6cea42859SHui // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 7cea42859SHui // 8cea42859SHui //===----------------------------------------------------------------------===// 9cea42859SHui 10cea42859SHui #ifndef _LIBCPP___THREAD_THIS_THREAD_H 11cea42859SHui #define _LIBCPP___THREAD_THIS_THREAD_H 12cea42859SHui 1309e3a360SLouis Dionne #include <__chrono/duration.h> 14cea42859SHui #include <__chrono/steady_clock.h> 15cea42859SHui #include <__chrono/time_point.h> 16cea42859SHui #include <__condition_variable/condition_variable.h> 17cea42859SHui #include <__config> 18cea42859SHui #include <__mutex/mutex.h> 19cea42859SHui #include <__mutex/unique_lock.h> 207162fd75SLouis Dionne #include <__thread/support.h> 21cea42859SHui 22cea42859SHui #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) 23cea42859SHui # pragma GCC system_header 24cea42859SHui #endif 25cea42859SHui 26cea42859SHui _LIBCPP_PUSH_MACROS 27cea42859SHui #include <__undef_macros> 28cea42859SHui 29cea42859SHui _LIBCPP_BEGIN_NAMESPACE_STD 30cea42859SHui 319783f28cSLouis Dionne namespace this_thread { 32cea42859SHui 33*c6f3b7bcSNikolas Klauser #if _LIBCPP_HAS_THREADS 3487d56c59SLouis Dionne 35cea42859SHui _LIBCPP_EXPORTED_FROM_ABI void sleep_for(const chrono::nanoseconds& __ns); 36cea42859SHui 37cea42859SHui template <class _Rep, class _Period> 389783f28cSLouis Dionne _LIBCPP_HIDE_FROM_ABI void sleep_for(const chrono::duration<_Rep, _Period>& __d) { 399783f28cSLouis Dionne if (__d > chrono::duration<_Rep, _Period>::zero()) { 40cea42859SHui // The standard guarantees a 64bit signed integer resolution for nanoseconds, 41cea42859SHui // so use INT64_MAX / 1e9 as cut-off point. Use a constant to avoid <climits> 42cea42859SHui // and issues with long double folding on PowerPC with GCC. 439783f28cSLouis Dionne _LIBCPP_CONSTEXPR chrono::duration<long double> __max = chrono::duration<long double>(9223372036.0L); 44cea42859SHui chrono::nanoseconds __ns; 459783f28cSLouis Dionne if (__d < __max) { 46cea42859SHui __ns = chrono::duration_cast<chrono::nanoseconds>(__d); 47cea42859SHui if (__ns < __d) 48cea42859SHui ++__ns; 499783f28cSLouis Dionne } else 50cea42859SHui __ns = chrono::nanoseconds::max(); 51cea42859SHui this_thread::sleep_for(__ns); 52cea42859SHui } 53cea42859SHui } 54cea42859SHui 55cea42859SHui template <class _Clock, class _Duration> 569783f28cSLouis Dionne _LIBCPP_HIDE_FROM_ABI void sleep_until(const chrono::time_point<_Clock, _Duration>& __t) { 57cea42859SHui mutex __mut; 58cea42859SHui condition_variable __cv; 59cea42859SHui unique_lock<mutex> __lk(__mut); 60cea42859SHui while (_Clock::now() < __t) 61cea42859SHui __cv.wait_until(__lk, __t); 62cea42859SHui } 63cea42859SHui 64cea42859SHui template <class _Duration> 659783f28cSLouis Dionne inline _LIBCPP_HIDE_FROM_ABI void sleep_until(const chrono::time_point<chrono::steady_clock, _Duration>& __t) { 66cea42859SHui this_thread::sleep_for(__t - chrono::steady_clock::now()); 67cea42859SHui } 68cea42859SHui 699783f28cSLouis Dionne inline _LIBCPP_HIDE_FROM_ABI void yield() _NOEXCEPT { __libcpp_thread_yield(); } 70cea42859SHui 71*c6f3b7bcSNikolas Klauser #endif // _LIBCPP_HAS_THREADS 7287d56c59SLouis Dionne 73cea42859SHui } // namespace this_thread 74cea42859SHui 75cea42859SHui _LIBCPP_END_NAMESPACE_STD 76cea42859SHui 77cea42859SHui _LIBCPP_POP_MACROS 78cea42859SHui 79cea42859SHui #endif // _LIBCPP___THREAD_THIS_THREAD_H 80