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 // <condition_variable>
11 
12 // class condition_variable_any;
13 
14 // template <class Lock, class Rep, class Period>
15 //   cv_status
16 //   wait_for(Lock& lock, const chrono::duration<Rep, Period>& rel_time);
17 
18 #include <condition_variable>
19 #include <mutex>
20 #include <thread>
21 #include <chrono>
22 #include <cassert>
23 
24 std::condition_variable_any cv;
25 
26 typedef std::timed_mutex L0;
27 typedef std::unique_lock<L0> L1;
28 
29 L0 m0;
30 
31 int test1 = 0;
32 int test2 = 0;
33 
34 int runs = 0;
35 
f()36 void f()
37 {
38     typedef std::chrono::system_clock Clock;
39     typedef std::chrono::milliseconds milliseconds;
40     L1 lk(m0);
41     assert(test2 == 0);
42     test1 = 1;
43     cv.notify_one();
44     Clock::time_point t0 = Clock::now();
45     while (test2 == 0 &&
46            cv.wait_for(lk, milliseconds(250)) == std::cv_status::no_timeout)
47         ;
48     Clock::time_point t1 = Clock::now();
49     if (runs == 0)
50     {
51         assert(t1 - t0 < milliseconds(250));
52         assert(test2 != 0);
53     }
54     else
55     {
56         assert(t1 - t0 - milliseconds(250) < milliseconds(50));
57         assert(test2 == 0);
58     }
59     ++runs;
60 }
61 
main()62 int main()
63 {
64     {
65         L1 lk(m0);
66         std::thread t(f);
67         assert(test1 == 0);
68         while (test1 == 0)
69             cv.wait(lk);
70         assert(test1 != 0);
71         test2 = 1;
72         lk.unlock();
73         cv.notify_one();
74         t.join();
75     }
76     test1 = 0;
77     test2 = 0;
78     {
79         L1 lk(m0);
80         std::thread t(f);
81         assert(test1 == 0);
82         while (test1 == 0)
83             cv.wait(lk);
84         assert(test1 != 0);
85         lk.unlock();
86         t.join();
87     }
88 }
89