1 //===----------------------------------------------------------------------===//
2 //
3 //                     The LLVM Compiler Infrastructure
4 //
5 // This file is dual licensed under the MIT and the University of Illinois Open
6 // Source Licenses. See LICENSE.TXT for details.
7 //
8 //===----------------------------------------------------------------------===//
9 //
10 // UNSUPPORTED: libcpp-has-no-threads
11 
12 // FLAKY_TEST.
13 
14 // <mutex>
15 
16 // class timed_mutex;
17 
18 // template <class Rep, class Period>
19 //   unique_lock(mutex_type& m, const chrono::duration<Rep, Period>& rel_time);
20 
21 #include <mutex>
22 #include <thread>
23 #include <cstdlib>
24 #include <cassert>
25 
26 std::timed_mutex m;
27 
28 typedef std::chrono::steady_clock Clock;
29 typedef Clock::time_point time_point;
30 typedef Clock::duration duration;
31 typedef std::chrono::milliseconds ms;
32 typedef std::chrono::nanoseconds ns;
33 
f1()34 void f1()
35 {
36     time_point t0 = Clock::now();
37     std::unique_lock<std::timed_mutex> lk(m, ms(300));
38     assert(lk.owns_lock() == true);
39     time_point t1 = Clock::now();
40     ns d = t1 - t0 - ms(250);
41     assert(d < ms(50));  // within 50ms
42 }
43 
f2()44 void f2()
45 {
46     time_point t0 = Clock::now();
47     std::unique_lock<std::timed_mutex> lk(m, ms(250));
48     assert(lk.owns_lock() == false);
49     time_point t1 = Clock::now();
50     ns d = t1 - t0 - ms(250);
51     assert(d < ms(50));  // within 50ms
52 }
53 
main()54 int main()
55 {
56     {
57         m.lock();
58         std::thread t(f1);
59         std::this_thread::sleep_for(ms(250));
60         m.unlock();
61         t.join();
62     }
63     {
64         m.lock();
65         std::thread t(f2);
66         std::this_thread::sleep_for(ms(300));
67         m.unlock();
68         t.join();
69     }
70 }
71