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
24std::timed_mutex m;
25
26typedef std::chrono::steady_clock Clock;
27typedef Clock::time_point time_point;
28typedef Clock::duration duration;
29typedef std::chrono::milliseconds ms;
30typedef std::chrono::nanoseconds ns;
31
32void 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
42void 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
52int 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