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//===----------------------------------------------------------------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
// <mutex>
// class timed_mutex;
// template <class Clock, class Duration>
// bool try_lock_until(const chrono::time_point<Clock, Duration>& abs_time);
#include <mutex>
#include <thread>
#include <cstdlib>
#include <cassert>
std::timed_mutex m;
typedef std::chrono::monotonic_clock Clock;
typedef Clock::time_point time_point;
typedef Clock::duration duration;
typedef std::chrono::milliseconds ms;
typedef std::chrono::nanoseconds ns;
void f1()
{
time_point t0 = Clock::now();
assert(m.try_lock_until(Clock::now() + ms(300)) == true);
time_point t1 = Clock::now();
m.unlock();
ns d = t1 - t0 - ms(250);
assert(d < ns(5000000)); // within 5ms
}
void f2()
{
time_point t0 = Clock::now();
assert(m.try_lock_until(Clock::now() + ms(250)) == false);
time_point t1 = Clock::now();
ns d = t1 - t0 - ms(250);
assert(d < ns(5000000)); // within 5ms
}
int main()
{
{
m.lock();
std::thread t(f1);
std::this_thread::sleep_for(ms(250));
m.unlock();
t.join();
}
{
m.lock();
std::thread t(f2);
std::this_thread::sleep_for(ms(300));
m.unlock();
t.join();
}
}
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