adaa6266fe
git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@120057 91177308-0d34-0410-b5e6-96231b3b80d8
66 lines
1.5 KiB
C++
66 lines
1.5 KiB
C++
//===----------------------------------------------------------------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is dual licensed under the MIT and the University of Illinois Open
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// Source Licenses. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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// <mutex>
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// class timed_mutex;
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// template <class Clock, class Duration>
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// bool try_lock_until(const chrono::time_point<Clock, Duration>& abs_time);
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#include <mutex>
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#include <thread>
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#include <cstdlib>
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#include <cassert>
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std::timed_mutex m;
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typedef std::chrono::steady_clock Clock;
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typedef Clock::time_point time_point;
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typedef Clock::duration duration;
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typedef std::chrono::milliseconds ms;
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typedef std::chrono::nanoseconds ns;
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void f1()
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{
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time_point t0 = Clock::now();
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assert(m.try_lock_until(Clock::now() + ms(300)) == true);
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time_point t1 = Clock::now();
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m.unlock();
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ns d = t1 - t0 - ms(250);
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assert(d < ns(5000000)); // within 5ms
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}
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void f2()
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{
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time_point t0 = Clock::now();
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assert(m.try_lock_until(Clock::now() + ms(250)) == false);
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time_point t1 = Clock::now();
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ns d = t1 - t0 - ms(250);
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assert(d < ns(5000000)); // within 5ms
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}
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int main()
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{
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{
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m.lock();
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std::thread t(f1);
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std::this_thread::sleep_for(ms(250));
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m.unlock();
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t.join();
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}
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{
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m.lock();
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std::thread t(f2);
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std::this_thread::sleep_for(ms(300));
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m.unlock();
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t.join();
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}
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}
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