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 // ALLOW_RETRIES: 2
12 
13 // <condition_variable>
14 
15 // class condition_variable_any;
16 
17 // template <class Lock, class Rep, class Period>
18 //   cv_status
19 //   wait_for(Lock& lock, const chrono::duration<Rep, Period>& rel_time);
20 
21 #include <condition_variable>
22 #include <mutex>
23 #include <thread>
24 #include <chrono>
25 #include <cassert>
26 
27 #include "test_macros.h"
28 
29 std::condition_variable_any cv;
30 
31 typedef std::timed_mutex L0;
32 typedef std::unique_lock<L0> L1;
33 
34 L0 m0;
35 
36 int test1 = 0;
37 int test2 = 0;
38 
39 int runs = 0;
40 
41 void f()
42 {
43     typedef std::chrono::system_clock Clock;
44     typedef std::chrono::milliseconds milliseconds;
45     L1 lk(m0);
46     assert(test2 == 0);
47     test1 = 1;
48     cv.notify_one();
49     Clock::time_point t0 = Clock::now();
50     while (test2 == 0 &&
51            cv.wait_for(lk, milliseconds(250)) == std::cv_status::no_timeout)
52         ;
53     Clock::time_point t1 = Clock::now();
54     if (runs == 0)
55     {
56         assert(t1 - t0 < milliseconds(250));
57         assert(test2 != 0);
58     }
59     else
60     {
61         assert(t1 - t0 - milliseconds(250) < milliseconds(50));
62         assert(test2 == 0);
63     }
64     ++runs;
65 }
66 
67 int main(int, char**)
68 {
69     {
70         L1 lk(m0);
71         std::thread t(f);
72         assert(test1 == 0);
73         while (test1 == 0)
74             cv.wait(lk);
75         assert(test1 != 0);
76         test2 = 1;
77         lk.unlock();
78         cv.notify_one();
79         t.join();
80     }
81     test1 = 0;
82     test2 = 0;
83     {
84         L1 lk(m0);
85         std::thread t(f);
86         assert(test1 == 0);
87         while (test1 == 0)
88             cv.wait(lk);
89         assert(test1 != 0);
90         lk.unlock();
91         t.join();
92     }
93 
94   return 0;
95 }
96