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//===----------------------------------------------------------------------===//
//
// 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
//
//===----------------------------------------------------------------------===//
//
// UNSUPPORTED: libcpp-has-no-threads
// FLAKY_TEST.
// <mutex>
// class mutex;
// void lock();
#include <mutex>
#include <thread>
#include <cstdlib>
#include <cassert>
#include "test_macros.h"
std::mutex m;
typedef std::chrono::system_clock Clock;
typedef Clock::time_point time_point;
typedef Clock::duration duration;
typedef std::chrono::milliseconds ms;
typedef std::chrono::nanoseconds ns;
void f()
{
time_point t0 = Clock::now();
m.lock();
time_point t1 = Clock::now();
m.unlock();
ns d = t1 - t0 - ms(250);
assert(d < ms(50)); // within 50ms
}
int main(int, char**)
{
m.lock();
std::thread t(f);
std::this_thread::sleep_for(ms(250));
m.unlock();
t.join();
return 0;
}
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