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 Duration, class Predicate>
18 // bool
19 // wait_until(Lock& lock,
20 // const chrono::time_point<Clock, Duration>& abs_time,
21 // Predicate pred);
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 struct Clock
33 {
34 typedef std::chrono::milliseconds duration;
35 typedef duration::rep rep;
36 typedef duration::period period;
37 typedef std::chrono::time_point<Clock> time_point;
38 static const bool is_steady = true;
39
nowClock40 static time_point now()
41 {
42 using namespace std::chrono;
43 return time_point(duration_cast<duration>(
44 steady_clock::now().time_since_epoch()
45 ));
46 }
47 };
48
49 class Pred
50 {
51 int& i_;
52 public:
Pred(int & i)53 explicit Pred(int& i) : i_(i) {}
54
operator ()()55 bool operator()() {return i_ != 0;}
56 };
57
58 std::condition_variable_any cv;
59
60 typedef std::timed_mutex L0;
61 typedef std::unique_lock<L0> L1;
62
63 L0 m0;
64
65 int test1 = 0;
66 int test2 = 0;
67
68 int runs = 0;
69
f()70 void f()
71 {
72 L1 lk(m0);
73 assert(test2 == 0);
74 test1 = 1;
75 cv.notify_one();
76 Clock::time_point t0 = Clock::now();
77 Clock::time_point t = t0 + Clock::duration(250);
78 bool r = cv.wait_until(lk, t, Pred(test2));
79 Clock::time_point t1 = Clock::now();
80 if (runs == 0)
81 {
82 assert(t1 - t0 < Clock::duration(250));
83 assert(test2 != 0);
84 assert(r);
85 }
86 else
87 {
88 assert(t1 - t0 - Clock::duration(250) < Clock::duration(50));
89 assert(test2 == 0);
90 assert(!r);
91 }
92 ++runs;
93 }
94
main(int,char **)95 int main(int, char**)
96 {
97 {
98 L1 lk(m0);
99 std::thread t = support::make_test_thread(f);
100 assert(test1 == 0);
101 while (test1 == 0)
102 cv.wait(lk);
103 assert(test1 != 0);
104 test2 = 1;
105 lk.unlock();
106 cv.notify_one();
107 t.join();
108 }
109 test1 = 0;
110 test2 = 0;
111 {
112 L1 lk(m0);
113 std::thread t = support::make_test_thread(f);
114 assert(test1 == 0);
115 while (test1 == 0)
116 cv.wait(lk);
117 assert(test1 != 0);
118 lk.unlock();
119 t.join();
120 }
121
122 return 0;
123 }
124