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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>
// template <class Mutex> class unique_lock;
// 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()
{
std::unique_lock<std::mutex> lk(m, std::defer_lock);
time_point t0 = Clock::now();
lk.lock();
time_point t1 = Clock::now();
assert(lk.owns_lock() == true);
ns d = t1 - t0 - ms(250);
assert(d < ms(25)); // within 25ms
#ifndef TEST_HAS_NO_EXCEPTIONS
try
{
lk.lock();
assert(false);
}
catch (std::system_error& e)
{
assert(e.code().value() == EDEADLK);
}
#endif
lk.unlock();
lk.release();
#ifndef TEST_HAS_NO_EXCEPTIONS
try
{
lk.lock();
assert(false);
}
catch (std::system_error& e)
{
assert(e.code().value() == EPERM);
}
#endif
}
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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