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 Rep, class Period, class Predicate>
17 //   bool
18 //   wait_for(Lock& lock, const chrono::duration<Rep, Period>& rel_time,
19 //            Predicate pred);
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 class Pred
31 {
32     int& i_;
33 public:
34     explicit Pred(int& i) : i_(i) {}
35 
36     bool operator()() {return i_ != 0;}
37 };
38 
39 std::condition_variable_any cv;
40 
41 typedef std::timed_mutex L0;
42 typedef std::unique_lock<L0> L1;
43 
44 L0 m0;
45 
46 int test1 = 0;
47 int test2 = 0;
48 
49 int runs = 0;
50 bool expect_result = false;
51 
52 void f()
53 {
54     typedef std::chrono::system_clock Clock;
55     typedef std::chrono::milliseconds milliseconds;
56     L1 lk(m0);
57     assert(test2 == 0);
58     test1 = 1;
59     cv.notify_one();
60     Clock::time_point t0 = Clock::now();
61     bool result = cv.wait_for(lk, milliseconds(250), Pred(test2));
62     assert(result == expect_result);
63     Clock::time_point t1 = Clock::now();
64     if (runs == 0)
65     {
66         assert(t1 - t0 < milliseconds(250));
67         assert(test2 != 0);
68     }
69     else
70     {
71         assert(t1 - t0 - milliseconds(250) < milliseconds(50));
72         assert(test2 == 0);
73     }
74     ++runs;
75 }
76 
77 int main(int, char**)
78 {
79     {
80         expect_result = true;
81         L1 lk(m0);
82         std::thread t = support::make_test_thread(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         expect_result = false;
96         L1 lk(m0);
97         std::thread t = support::make_test_thread(f);
98         assert(test1 == 0);
99         while (test1 == 0)
100             cv.wait(lk);
101         assert(test1 != 0);
102         lk.unlock();
103         t.join();
104     }
105 
106   return 0;
107 }
108