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;
15 
16 // template <class Rep, class Period>
17 //     cv_status
18 //     wait_for(unique_lock<mutex>& lock,
19 //              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 "make_test_thread.h"
28 #include "test_macros.h"
29 
30 std::condition_variable cv;
31 std::mutex mut;
32 
33 int test1 = 0;
34 int test2 = 0;
35 
36 bool expect_timeout = false;
37 
f()38 void f()
39 {
40     typedef std::chrono::system_clock Clock;
41     typedef std::chrono::milliseconds milliseconds;
42     std::unique_lock<std::mutex> lk(mut);
43     assert(test2 == 0);
44     test1 = 1;
45     cv.notify_one();
46     Clock::time_point t0 = Clock::now();
47     Clock::time_point wait_end = t0 + milliseconds(250);
48     Clock::duration d;
49     do {
50         d = wait_end - Clock::now();
51         if (d <= milliseconds(0)) break;
52     } while (test2 == 0 && cv.wait_for(lk, d) == std::cv_status::no_timeout);
53     Clock::time_point t1 = Clock::now();
54     if (!expect_timeout)
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 }
65 
main(int,char **)66 int main(int, char**)
67 {
68     {
69         std::unique_lock<std::mutex> lk(mut);
70         std::thread t = support::make_test_thread(f);
71         assert(test1 == 0);
72         while (test1 == 0)
73             cv.wait(lk);
74         assert(test1 != 0);
75         test2 = 1;
76         lk.unlock();
77         cv.notify_one();
78         t.join();
79     }
80     test1 = 0;
81     test2 = 0;
82     expect_timeout = true;
83     {
84         std::unique_lock<std::mutex> lk(mut);
85         std::thread t = support::make_test_thread(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