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156ab87500
See: * https://discourse.llvm.org/t/rfc-freezing-c-03-headers-in-libc/77319 * https://discourse.llvm.org/t/rfc-project-hand-in-hand-llvm-libc-libc-code-sharing/77701 We're dropping support for C++03 for Zig due to the first change; it would be insane to ship 1018 duplicate header files just for this outdated use case. As a result of the second change, I had to bring in a subset of the headers from llvm-libc since libc++ now depends on these. Hopefully we can continue to get away with not copying the entirety of llvm-libc.
79 lines
2.4 KiB
C++
Vendored
79 lines
2.4 KiB
C++
Vendored
// -*- C++ -*-
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//===----------------------------------------------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#ifndef _LIBCPP___THREAD_THIS_THREAD_H
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#define _LIBCPP___THREAD_THIS_THREAD_H
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#include <__chrono/duration.h>
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#include <__chrono/steady_clock.h>
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#include <__chrono/time_point.h>
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#include <__condition_variable/condition_variable.h>
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#include <__config>
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#include <__mutex/mutex.h>
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#include <__mutex/unique_lock.h>
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#include <__thread/support.h>
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#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
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# pragma GCC system_header
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#endif
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_LIBCPP_PUSH_MACROS
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#include <__undef_macros>
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_LIBCPP_BEGIN_NAMESPACE_STD
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namespace this_thread {
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#if _LIBCPP_HAS_THREADS
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_LIBCPP_EXPORTED_FROM_ABI void sleep_for(const chrono::nanoseconds& __ns);
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template <class _Rep, class _Period>
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_LIBCPP_HIDE_FROM_ABI void sleep_for(const chrono::duration<_Rep, _Period>& __d) {
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if (__d > chrono::duration<_Rep, _Period>::zero()) {
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// The standard guarantees a 64bit signed integer resolution for nanoseconds,
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// so use INT64_MAX / 1e9 as cut-off point. Use a constant to avoid <climits>
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// and issues with long double folding on PowerPC with GCC.
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_LIBCPP_CONSTEXPR chrono::duration<long double> __max = chrono::duration<long double>(9223372036.0L);
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chrono::nanoseconds __ns;
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if (__d < __max) {
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__ns = chrono::duration_cast<chrono::nanoseconds>(__d);
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if (__ns < __d)
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++__ns;
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} else
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__ns = chrono::nanoseconds::max();
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this_thread::sleep_for(__ns);
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}
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}
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template <class _Clock, class _Duration>
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_LIBCPP_HIDE_FROM_ABI void sleep_until(const chrono::time_point<_Clock, _Duration>& __t) {
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mutex __mut;
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condition_variable __cv;
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unique_lock<mutex> __lk(__mut);
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while (_Clock::now() < __t)
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__cv.wait_until(__lk, __t);
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}
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template <class _Duration>
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inline _LIBCPP_HIDE_FROM_ABI void sleep_until(const chrono::time_point<chrono::steady_clock, _Duration>& __t) {
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this_thread::sleep_for(__t - chrono::steady_clock::now());
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}
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inline _LIBCPP_HIDE_FROM_ABI void yield() _NOEXCEPT { __libcpp_thread_yield(); }
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#endif // _LIBCPP_HAS_THREADS
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} // namespace this_thread
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_LIBCPP_END_NAMESPACE_STD
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_LIBCPP_POP_MACROS
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#endif // _LIBCPP___THREAD_THIS_THREAD_H
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