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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 lock_guard;
// explicit lock_guard(mutex_type& m);
// template<class _Mutex> lock_guard(lock_guard<_Mutex>)
// -> lock_guard<_Mutex>; // C++17
#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();
time_point t1;
{
std::lock_guard<std::mutex> lg(m);
t1 = Clock::now();
}
ns d = t1 - t0 - ms(250);
assert(d < ms(200)); // within 200ms
}
int main(int, char**)
{
m.lock();
std::thread t(f);
std::this_thread::sleep_for(ms(250));
m.unlock();
t.join();
#ifdef __cpp_deduction_guides
std::lock_guard lg(m);
static_assert((std::is_same<decltype(lg), std::lock_guard<decltype(m)>>::value), "" );
#endif
return 0;
}
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