1e78f53d1SNikolas Klauser // -*- C++ -*- 2e78f53d1SNikolas Klauser //===----------------------------------------------------------------------===// 3e78f53d1SNikolas Klauser // 4e78f53d1SNikolas Klauser // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 5e78f53d1SNikolas Klauser // See https://llvm.org/LICENSE.txt for license information. 6e78f53d1SNikolas Klauser // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 7e78f53d1SNikolas Klauser // 8e78f53d1SNikolas Klauser //===----------------------------------------------------------------------===// 9e78f53d1SNikolas Klauser 10*ce777190SNikolas Klauser #ifndef _LIBCPP___CXX03___THREAD_THIS_THREAD_H 11*ce777190SNikolas Klauser #define _LIBCPP___CXX03___THREAD_THIS_THREAD_H 12e78f53d1SNikolas Klauser 1373fbae83SNikolas Klauser #include <__cxx03/__chrono/steady_clock.h> 1473fbae83SNikolas Klauser #include <__cxx03/__chrono/time_point.h> 1573fbae83SNikolas Klauser #include <__cxx03/__condition_variable/condition_variable.h> 1673fbae83SNikolas Klauser #include <__cxx03/__config> 1773fbae83SNikolas Klauser #include <__cxx03/__mutex/mutex.h> 1873fbae83SNikolas Klauser #include <__cxx03/__mutex/unique_lock.h> 1973fbae83SNikolas Klauser #include <__cxx03/__thread/support.h> 20e78f53d1SNikolas Klauser 21e78f53d1SNikolas Klauser #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) 22e78f53d1SNikolas Klauser # pragma GCC system_header 23e78f53d1SNikolas Klauser #endif 24e78f53d1SNikolas Klauser 25e78f53d1SNikolas Klauser _LIBCPP_PUSH_MACROS 2673fbae83SNikolas Klauser #include <__cxx03/__undef_macros> 27e78f53d1SNikolas Klauser 28e78f53d1SNikolas Klauser _LIBCPP_BEGIN_NAMESPACE_STD 29e78f53d1SNikolas Klauser 30e78f53d1SNikolas Klauser namespace this_thread { 31e78f53d1SNikolas Klauser 32e78f53d1SNikolas Klauser _LIBCPP_EXPORTED_FROM_ABI void sleep_for(const chrono::nanoseconds& __ns); 33e78f53d1SNikolas Klauser 34e78f53d1SNikolas Klauser template <class _Rep, class _Period> 35e78f53d1SNikolas Klauser _LIBCPP_HIDE_FROM_ABI void sleep_for(const chrono::duration<_Rep, _Period>& __d) { 36e78f53d1SNikolas Klauser if (__d > chrono::duration<_Rep, _Period>::zero()) { 37e78f53d1SNikolas Klauser // The standard guarantees a 64bit signed integer resolution for nanoseconds, 38e78f53d1SNikolas Klauser // so use INT64_MAX / 1e9 as cut-off point. Use a constant to avoid <climits> 39e78f53d1SNikolas Klauser // and issues with long double folding on PowerPC with GCC. 40e78f53d1SNikolas Klauser _LIBCPP_CONSTEXPR chrono::duration<long double> __max = chrono::duration<long double>(9223372036.0L); 41e78f53d1SNikolas Klauser chrono::nanoseconds __ns; 42e78f53d1SNikolas Klauser if (__d < __max) { 43e78f53d1SNikolas Klauser __ns = chrono::duration_cast<chrono::nanoseconds>(__d); 44e78f53d1SNikolas Klauser if (__ns < __d) 45e78f53d1SNikolas Klauser ++__ns; 46e78f53d1SNikolas Klauser } else 47e78f53d1SNikolas Klauser __ns = chrono::nanoseconds::max(); 48e78f53d1SNikolas Klauser this_thread::sleep_for(__ns); 49e78f53d1SNikolas Klauser } 50e78f53d1SNikolas Klauser } 51e78f53d1SNikolas Klauser 52e78f53d1SNikolas Klauser template <class _Clock, class _Duration> 53e78f53d1SNikolas Klauser _LIBCPP_HIDE_FROM_ABI void sleep_until(const chrono::time_point<_Clock, _Duration>& __t) { 54e78f53d1SNikolas Klauser mutex __mut; 55e78f53d1SNikolas Klauser condition_variable __cv; 56e78f53d1SNikolas Klauser unique_lock<mutex> __lk(__mut); 57e78f53d1SNikolas Klauser while (_Clock::now() < __t) 58e78f53d1SNikolas Klauser __cv.wait_until(__lk, __t); 59e78f53d1SNikolas Klauser } 60e78f53d1SNikolas Klauser 61e78f53d1SNikolas Klauser template <class _Duration> 62e78f53d1SNikolas Klauser inline _LIBCPP_HIDE_FROM_ABI void sleep_until(const chrono::time_point<chrono::steady_clock, _Duration>& __t) { 63e78f53d1SNikolas Klauser this_thread::sleep_for(__t - chrono::steady_clock::now()); 64e78f53d1SNikolas Klauser } 65e78f53d1SNikolas Klauser 66e78f53d1SNikolas Klauser inline _LIBCPP_HIDE_FROM_ABI void yield() _NOEXCEPT { __libcpp_thread_yield(); } 67e78f53d1SNikolas Klauser 68e78f53d1SNikolas Klauser } // namespace this_thread 69e78f53d1SNikolas Klauser 70e78f53d1SNikolas Klauser _LIBCPP_END_NAMESPACE_STD 71e78f53d1SNikolas Klauser 72e78f53d1SNikolas Klauser _LIBCPP_POP_MACROS 73e78f53d1SNikolas Klauser 74*ce777190SNikolas Klauser #endif // _LIBCPP___CXX03___THREAD_THIS_THREAD_H 75