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| 1 | // -*- C++ -*- |
|---|---|
| 2 | //===----------------------------------------------------------------------===// |
| 3 | // |
| 4 | // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
| 5 | // See https://llvm.org/LICENSE.txt for license information. |
| 6 | // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
| 7 | // |
| 8 | //===----------------------------------------------------------------------===// |
| 9 | |
| 10 | #ifndef _LIBCPP___CXX03___THREAD_THIS_THREAD_H |
| 11 | #define _LIBCPP___CXX03___THREAD_THIS_THREAD_H |
| 12 | |
| 13 | #include <__cxx03/__chrono/steady_clock.h> |
| 14 | #include <__cxx03/__chrono/time_point.h> |
| 15 | #include <__cxx03/__condition_variable/condition_variable.h> |
| 16 | #include <__cxx03/__config> |
| 17 | #include <__cxx03/__mutex/mutex.h> |
| 18 | #include <__cxx03/__mutex/unique_lock.h> |
| 19 | #include <__cxx03/__thread/support.h> |
| 20 | |
| 21 | #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) |
| 22 | # pragma GCC system_header |
| 23 | #endif |
| 24 | |
| 25 | _LIBCPP_PUSH_MACROS |
| 26 | #include <__cxx03/__undef_macros> |
| 27 | |
| 28 | _LIBCPP_BEGIN_NAMESPACE_STD |
| 29 | |
| 30 | namespace this_thread { |
| 31 | |
| 32 | _LIBCPP_EXPORTED_FROM_ABI void sleep_for(const chrono::nanoseconds& __ns); |
| 33 | |
| 34 | template <class _Rep, class _Period> |
| 35 | _LIBCPP_HIDE_FROM_ABI void sleep_for(const chrono::duration<_Rep, _Period>& __d) { |
| 36 | if (__d > chrono::duration<_Rep, _Period>::zero()) { |
| 37 | // The standard guarantees a 64bit signed integer resolution for nanoseconds, |
| 38 | // so use INT64_MAX / 1e9 as cut-off point. Use a constant to avoid <climits> |
| 39 | // and issues with long double folding on PowerPC with GCC. |
| 40 | chrono::duration<long double> __max = chrono::duration<long double>(9223372036.0L); |
| 41 | chrono::nanoseconds __ns; |
| 42 | if (__d < __max) { |
| 43 | __ns = chrono::duration_cast<chrono::nanoseconds>(__d); |
| 44 | if (__ns < __d) |
| 45 | ++__ns; |
| 46 | } else |
| 47 | __ns = chrono::nanoseconds::max(); |
| 48 | this_thread::sleep_for(__ns); |
| 49 | } |
| 50 | } |
| 51 | |
| 52 | template <class _Clock, class _Duration> |
| 53 | _LIBCPP_HIDE_FROM_ABI void sleep_until(const chrono::time_point<_Clock, _Duration>& __t) { |
| 54 | mutex __mut; |
| 55 | condition_variable __cv; |
| 56 | unique_lock<mutex> __lk(__mut); |
| 57 | while (_Clock::now() < __t) |
| 58 | __cv.wait_until(__lk, __t); |
| 59 | } |
| 60 | |
| 61 | template <class _Duration> |
| 62 | inline _LIBCPP_HIDE_FROM_ABI void sleep_until(const chrono::time_point<chrono::steady_clock, _Duration>& __t) { |
| 63 | this_thread::sleep_for(__t - chrono::steady_clock::now()); |
| 64 | } |
| 65 | |
| 66 | inline _LIBCPP_HIDE_FROM_ABI void yield() _NOEXCEPT { __libcpp_thread_yield(); } |
| 67 | |
| 68 | } // namespace this_thread |
| 69 | |
| 70 | _LIBCPP_END_NAMESPACE_STD |
| 71 | |
| 72 | _LIBCPP_POP_MACROS |
| 73 | |
| 74 | #endif // _LIBCPP___CXX03___THREAD_THIS_THREAD_H |
| 75 |
Warning: This file is not a C or C++ file. It does not have highlighting.