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// void lock();
17
18#include <mutex>
19#include <thread>
20#include <cstdlib>
21#include <cassert>
22
23#include <iostream>
24
25std::timed_mutex m;
26
27typedef std::chrono::system_clock Clock;
28typedef Clock::time_point time_point;
29typedef Clock::duration duration;
30typedef std::chrono::milliseconds ms;
31typedef std::chrono::nanoseconds ns;
32
33void f()
34{
35    time_point t0 = Clock::now();
36    m.lock();
37    time_point t1 = Clock::now();
38    m.unlock();
39    ns d = t1 - t0 - ms(250);
40    assert(d < ms(50));  // within 50ms
41}
42
43int main()
44{
45    m.lock();
46    std::thread t(f);
47    std::this_thread::sleep_for(ms(250));
48    m.unlock();
49    t.join();
50}
51