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 // ALLOW_RETRIES: 2
11 
12 // TODO(ldionne): This test fails on Ubuntu Focal on our CI nodes (and only there), in 32 bit mode.
13 // UNSUPPORTED: linux && 32bits-on-64bits
14 
15 // <condition_variable>
16 
17 // class condition_variable_any;
18 
19 // template <class Lock, class Rep, class Period>
20 //   cv_status
21 //   wait_for(Lock& lock, const chrono::duration<Rep, Period>& rel_time);
22 
23 #include <condition_variable>
24 #include <mutex>
25 #include <thread>
26 #include <chrono>
27 #include <cassert>
28 
29 #include "make_test_thread.h"
30 #include "test_macros.h"
31 
32 std::condition_variable_any cv;
33 
34 typedef std::timed_mutex L0;
35 typedef std::unique_lock<L0> L1;
36 
37 L0 m0;
38 
39 int test1 = 0;
40 int test2 = 0;
41 
42 bool expect_timeout = false;
43 
44 void f()
45 {
46     typedef std::chrono::system_clock Clock;
47     typedef std::chrono::milliseconds milliseconds;
48     L1 lk(m0);
49     assert(test2 == 0);
50     test1 = 1;
51     cv.notify_one();
52     Clock::time_point t0 = Clock::now();
53     Clock::time_point wait_end = t0 + milliseconds(250);
54     Clock::duration d;
55     do {
56         d = wait_end - Clock::now();
57         if (d <= milliseconds(0)) break;
58     } while (test2 == 0 && cv.wait_for(lk, d) == std::cv_status::no_timeout);
59     Clock::time_point t1 = Clock::now();
60     if (!expect_timeout)
61     {
62         assert(t1 - t0 < milliseconds(250));
63         assert(test2 != 0);
64     }
65     else
66     {
67         assert(t1 - t0 - milliseconds(250) < milliseconds(50));
68         assert(test2 == 0);
69     }
70 }
71 
72 int main(int, char**)
73 {
74     {
75         L1 lk(m0);
76         std::thread t = support::make_test_thread(f);
77         assert(test1 == 0);
78         while (test1 == 0)
79             cv.wait(lk);
80         assert(test1 != 0);
81         test2 = 1;
82         lk.unlock();
83         cv.notify_one();
84         t.join();
85     }
86     test1 = 0;
87     test2 = 0;
88     expect_timeout = true;
89     {
90         L1 lk(m0);
91         std::thread t = support::make_test_thread(f);
92         assert(test1 == 0);
93         while (test1 == 0)
94             cv.wait(lk);
95         assert(test1 != 0);
96         lk.unlock();
97         t.join();
98     }
99 
100   return 0;
101 }
102