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 Clock, class Duration>
15 //   cv_status
16 //   wait_until(Lock& lock, const chrono::time_point<Clock, Duration>& abs_time);
17 
18 #include <condition_variable>
19 #include <mutex>
20 #include <thread>
21 #include <chrono>
22 #include <cassert>
23 
24 struct Clock
25 {
26     typedef std::chrono::milliseconds duration;
27     typedef duration::rep             rep;
28     typedef duration::period          period;
29     typedef std::chrono::time_point<Clock> time_point;
30     static const bool is_steady =  true;
31 
32     static time_point now()
33     {
34         using namespace std::chrono;
35         return time_point(duration_cast<duration>(
36                 steady_clock::now().time_since_epoch()
37                                                  ));
38     }
39 };
40 
41 std::condition_variable_any cv;
42 
43 typedef std::timed_mutex L0;
44 typedef std::unique_lock<L0> L1;
45 
46 L0 m0;
47 
48 int test1 = 0;
49 int test2 = 0;
50 
51 int runs = 0;
52 
53 void f()
54 {
55     L1 lk(m0);
56     assert(test2 == 0);
57     test1 = 1;
58     cv.notify_one();
59     Clock::time_point t0 = Clock::now();
60     Clock::time_point t = t0 + Clock::duration(250);
61     while (test2 == 0 && cv.wait_until(lk, t) == std::cv_status::no_timeout)
62         ;
63     Clock::time_point t1 = Clock::now();
64     if (runs == 0)
65     {
66         assert(t1 - t0 < Clock::duration(250));
67         assert(test2 != 0);
68     }
69     else
70     {
71         assert(t1 - t0 - Clock::duration(250) < Clock::duration(50));
72         assert(test2 == 0);
73     }
74     ++runs;
75 }
76 
77 int main()
78 {
79     {
80         L1 lk(m0);
81         std::thread t(f);
82         assert(test1 == 0);
83         while (test1 == 0)
84             cv.wait(lk);
85         assert(test1 != 0);
86         test2 = 1;
87         lk.unlock();
88         cv.notify_one();
89         t.join();
90     }
91     test1 = 0;
92     test2 = 0;
93     {
94         L1 lk(m0);
95         std::thread t(f);
96         assert(test1 == 0);
97         while (test1 == 0)
98             cv.wait(lk);
99         assert(test1 != 0);
100         lk.unlock();
101         t.join();
102     }
103 }
104