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 
11 // <condition_variable>
12 
13 // class condition_variable_any;
14 
15 // template <class Lock, class Clock, class Duration>
16 //   cv_status
17 //   wait_until(Lock& lock, const chrono::time_point<Clock, Duration>& abs_time);
18 
19 #include <condition_variable>
20 #include <mutex>
21 #include <thread>
22 #include <chrono>
23 #include <cassert>
24 
25 struct Clock
26 {
27     typedef std::chrono::milliseconds duration;
28     typedef duration::rep             rep;
29     typedef duration::period          period;
30     typedef std::chrono::time_point<Clock> time_point;
31     static const bool is_steady =  true;
32 
33     static time_point now()
34     {
35         using namespace std::chrono;
36         return time_point(duration_cast<duration>(
37                 steady_clock::now().time_since_epoch()
38                                                  ));
39     }
40 };
41 
42 std::condition_variable_any cv;
43 
44 typedef std::timed_mutex L0;
45 typedef std::unique_lock<L0> L1;
46 
47 L0 m0;
48 
49 int test1 = 0;
50 int test2 = 0;
51 
52 int runs = 0;
53 
54 void f()
55 {
56     L1 lk(m0);
57     assert(test2 == 0);
58     test1 = 1;
59     cv.notify_one();
60     Clock::time_point t0 = Clock::now();
61     Clock::time_point t = t0 + Clock::duration(250);
62     while (test2 == 0 && cv.wait_until(lk, t) == std::cv_status::no_timeout)
63         ;
64     Clock::time_point t1 = Clock::now();
65     if (runs == 0)
66     {
67         assert(t1 - t0 < Clock::duration(250));
68         assert(test2 != 0);
69     }
70     else
71     {
72         assert(t1 - t0 - Clock::duration(250) < Clock::duration(50));
73         assert(test2 == 0);
74     }
75     ++runs;
76 }
77 
78 int main(int, char**)
79 {
80     {
81         L1 lk(m0);
82         std::thread t(f);
83         assert(test1 == 0);
84         while (test1 == 0)
85             cv.wait(lk);
86         assert(test1 != 0);
87         test2 = 1;
88         lk.unlock();
89         cv.notify_one();
90         t.join();
91     }
92     test1 = 0;
93     test2 = 0;
94     {
95         L1 lk(m0);
96         std::thread t(f);
97         assert(test1 == 0);
98         while (test1 == 0)
99             cv.wait(lk);
100         assert(test1 != 0);
101         lk.unlock();
102         t.join();
103     }
104 
105   return 0;
106 }
107