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 // <mutex>
13 
14 // class timed_mutex;
15 
16 // template <class Rep, class Period>
17 //   unique_lock(mutex_type& m, const chrono::duration<Rep, Period>& rel_time);
18 
19 #include <mutex>
20 #include <thread>
21 #include <cstdlib>
22 #include <cassert>
23 
24 std::timed_mutex m;
25 
26 typedef std::chrono::steady_clock Clock;
27 typedef Clock::time_point time_point;
28 typedef Clock::duration duration;
29 typedef std::chrono::milliseconds ms;
30 typedef std::chrono::nanoseconds ns;
31 
f1()32 void f1()
33 {
34     time_point t0 = Clock::now();
35     std::unique_lock<std::timed_mutex> lk(m, ms(300));
36     assert(lk.owns_lock() == true);
37     time_point t1 = Clock::now();
38     ns d = t1 - t0 - ms(250);
39     assert(d < ms(50));  // within 50ms
40 }
41 
f2()42 void f2()
43 {
44     time_point t0 = Clock::now();
45     std::unique_lock<std::timed_mutex> lk(m, ms(250));
46     assert(lk.owns_lock() == false);
47     time_point t1 = Clock::now();
48     ns d = t1 - t0 - ms(250);
49     assert(d < ms(50));  // within 50ms
50 }
51 
main()52 int main()
53 {
54     {
55         m.lock();
56         std::thread t(f1);
57         std::this_thread::sleep_for(ms(250));
58         m.unlock();
59         t.join();
60     }
61     {
62         m.lock();
63         std::thread t(f2);
64         std::this_thread::sleep_for(ms(300));
65         m.unlock();
66         t.join();
67     }
68 }
69