1 //===----------------------------------------------------------------------===//
2 //
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6 //
7 //===----------------------------------------------------------------------===//
8 
9 // UNSUPPORTED: libcpp-has-no-threads
10 // ALLOW_RETRIES: 2
11 
12 // <mutex>
13 
14 // class timed_mutex;
15 
16 // void lock();
17 
18 #include <mutex>
19 #include <thread>
20 #include <cstdlib>
21 #include <cassert>
22 
23 #include "make_test_thread.h"
24 #include "test_macros.h"
25 
26 std::timed_mutex m;
27 
28 typedef std::chrono::system_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 
f()34 void f()
35 {
36     time_point t0 = Clock::now();
37     m.lock();
38     time_point t1 = Clock::now();
39     m.unlock();
40     ns d = t1 - t0 - ms(250);
41     assert(d < ms(50));  // within 50ms
42 }
43 
main(int,char **)44 int main(int, char**)
45 {
46     m.lock();
47     std::thread t = support::make_test_thread(f);
48     std::this_thread::sleep_for(ms(250));
49     m.unlock();
50     t.join();
51 
52   return 0;
53 }
54