1 files changed, 87 insertions, 0 deletions
diff --git a/contrib/llvm-project/libcxx/include/__thread/this_thread.h b/contrib/llvm-project/libcxx/include/__thread/this_thread.h
new file mode 100644
index 000000000000..b79065eeedae
--- /dev/null
+++ b/contrib/llvm-project/libcxx/include/__thread/this_thread.h
@@ -0,0 +1,87 @@
+// -*- C++ -*-
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef _LIBCPP___THREAD_THIS_THREAD_H
+#define _LIBCPP___THREAD_THIS_THREAD_H
+
+#include <__chrono/steady_clock.h>
+#include <__chrono/time_point.h>
+#include <__condition_variable/condition_variable.h>
+#include <__config>
+#include <__mutex/mutex.h>
+#include <__mutex/unique_lock.h>
+#include <__threading_support>
+
+#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
+#  pragma GCC system_header
+#endif
+
+_LIBCPP_PUSH_MACROS
+#include <__undef_macros>
+
+_LIBCPP_BEGIN_NAMESPACE_STD
+
+namespace this_thread
+{
+
+_LIBCPP_EXPORTED_FROM_ABI void sleep_for(const chrono::nanoseconds& __ns);
+
+template <class _Rep, class _Period>
+_LIBCPP_HIDE_FROM_ABI void
+sleep_for(const chrono::duration<_Rep, _Period>& __d)
+{
+    if (__d > chrono::duration<_Rep, _Period>::zero())
+    {
+        // The standard guarantees a 64bit signed integer resolution for nanoseconds,
+        // so use INT64_MAX / 1e9 as cut-off point. Use a constant to avoid <climits>
+        // and issues with long double folding on PowerPC with GCC.
+        _LIBCPP_CONSTEXPR chrono::duration<long double> __max =
+            chrono::duration<long double>(9223372036.0L);
+        chrono::nanoseconds __ns;
+        if (__d < __max)
+        {
+            __ns = chrono::duration_cast<chrono::nanoseconds>(__d);
+            if (__ns < __d)
+                ++__ns;
+        }
+        else
+            __ns = chrono::nanoseconds::max();
+        this_thread::sleep_for(__ns);
+    }
+}
+
+template <class _Clock, class _Duration>
+_LIBCPP_HIDE_FROM_ABI void
+sleep_until(const chrono::time_point<_Clock, _Duration>& __t)
+{
+    mutex __mut;
+    condition_variable __cv;
+    unique_lock<mutex> __lk(__mut);
+    while (_Clock::now() < __t)
+        __cv.wait_until(__lk, __t);
+}
+
+template <class _Duration>
+inline _LIBCPP_INLINE_VISIBILITY
+void
+sleep_until(const chrono::time_point<chrono::steady_clock, _Duration>& __t)
+{
+    this_thread::sleep_for(__t - chrono::steady_clock::now());
+}
+
+inline _LIBCPP_INLINE_VISIBILITY
+void yield() _NOEXCEPT {__libcpp_thread_yield();}
+
+} // namespace this_thread
+
+_LIBCPP_END_NAMESPACE_STD
+
+_LIBCPP_POP_MACROS
+
+#endif // _LIBCPP___THREAD_THIS_THREAD_H