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: no-threads
10 // ALLOW_RETRIES: 2
11 
12 // <condition_variable>
13 
14 // class condition_variable_any;
15 
16 // template <class Lock, class Clock, class Duration>
17 //   cv_status
18 //   wait_until(Lock& lock, const chrono::time_point<Clock, Duration>& abs_time);
19 
20 #include <condition_variable>
21 #include <mutex>
22 #include <thread>
23 #include <chrono>
24 #include <cassert>
25 
26 #include "make_test_thread.h"
27 #include "test_macros.h"
28 
29 struct Clock
30 {
31     typedef std::chrono::milliseconds duration;
32     typedef duration::rep             rep;
33     typedef duration::period          period;
34     typedef std::chrono::time_point<Clock> time_point;
35     static const bool is_steady =  true;
36 
nowClock37     static time_point now()
38     {
39         using namespace std::chrono;
40         return time_point(duration_cast<duration>(
41                 steady_clock::now().time_since_epoch()
42                                                  ));
43     }
44 };
45 
46 std::condition_variable_any cv;
47 
48 typedef std::timed_mutex L0;
49 typedef std::unique_lock<L0> L1;
50 
51 L0 m0;
52 
53 int test1 = 0;
54 int test2 = 0;
55 
56 int runs = 0;
57 
f()58 void f()
59 {
60     L1 lk(m0);
61     assert(test2 == 0);
62     test1 = 1;
63     cv.notify_one();
64     Clock::time_point t0 = Clock::now();
65     Clock::time_point t = t0 + Clock::duration(250);
66     while (test2 == 0 && cv.wait_until(lk, t) == std::cv_status::no_timeout)
67         ;
68     Clock::time_point t1 = Clock::now();
69     if (runs == 0)
70     {
71         assert(t1 - t0 < Clock::duration(250));
72         assert(test2 != 0);
73     }
74     else
75     {
76         assert(t1 - t0 - Clock::duration(250) < Clock::duration(50));
77         assert(test2 == 0);
78     }
79     ++runs;
80 }
81 
main(int,char **)82 int main(int, char**)
83 {
84     {
85         L1 lk(m0);
86         std::thread t = support::make_test_thread(f);
87         assert(test1 == 0);
88         while (test1 == 0)
89             cv.wait(lk);
90         assert(test1 != 0);
91         test2 = 1;
92         lk.unlock();
93         cv.notify_one();
94         t.join();
95     }
96     test1 = 0;
97     test2 = 0;
98     {
99         L1 lk(m0);
100         std::thread t = support::make_test_thread(f);
101         assert(test1 == 0);
102         while (test1 == 0)
103             cv.wait(lk);
104         assert(test1 != 0);
105         lk.unlock();
106         t.join();
107     }
108 
109   return 0;
110 }
111