1 //===----------------------------------------------------------------------===//
2 //
3 //                     The LLVM Compiler Infrastructure
4 //
5 // This file is dual licensed under the MIT and the University of Illinois Open
6 // Source Licenses. See LICENSE.TXT for details.
7 //
8 //===----------------------------------------------------------------------===//
9 //
10 // UNSUPPORTED: libcpp-has-no-threads
11 
12 // <condition_variable>
13 
14 // class condition_variable_any;
15 
16 // template <class Lock, class Duration, class Predicate>
17 //     bool
18 //     wait_until(Lock& lock,
19 //                const chrono::time_point<Clock, Duration>& abs_time,
20 //                Predicate pred);
21 
22 #include <condition_variable>
23 #include <mutex>
24 #include <thread>
25 #include <chrono>
26 #include <cassert>
27 
28 struct Clock
29 {
30     typedef std::chrono::milliseconds duration;
31     typedef duration::rep             rep;
32     typedef duration::period          period;
33     typedef std::chrono::time_point<Clock> time_point;
34     static const bool is_steady =  true;
35 
nowClock36     static time_point now()
37     {
38         using namespace std::chrono;
39         return time_point(duration_cast<duration>(
40                 steady_clock::now().time_since_epoch()
41                                                  ));
42     }
43 };
44 
45 class Pred
46 {
47     int& i_;
48 public:
Pred(int & i)49     explicit Pred(int& i) : i_(i) {}
50 
operator ()()51     bool operator()() {return i_ != 0;}
52 };
53 
54 std::condition_variable_any cv;
55 
56 typedef std::timed_mutex L0;
57 typedef std::unique_lock<L0> L1;
58 
59 L0 m0;
60 
61 int test1 = 0;
62 int test2 = 0;
63 
64 int runs = 0;
65 
f()66 void f()
67 {
68     L1 lk(m0);
69     assert(test2 == 0);
70     test1 = 1;
71     cv.notify_one();
72     Clock::time_point t0 = Clock::now();
73     Clock::time_point t = t0 + Clock::duration(250);
74     bool r = cv.wait_until(lk, t, Pred(test2));
75     Clock::time_point t1 = Clock::now();
76     if (runs == 0)
77     {
78         assert(t1 - t0 < Clock::duration(250));
79         assert(test2 != 0);
80         assert(r);
81     }
82     else
83     {
84         assert(t1 - t0 - Clock::duration(250) < Clock::duration(50));
85         assert(test2 == 0);
86         assert(!r);
87     }
88     ++runs;
89 }
90 
main()91 int main()
92 {
93     {
94         L1 lk(m0);
95         std::thread t(f);
96         assert(test1 == 0);
97         while (test1 == 0)
98             cv.wait(lk);
99         assert(test1 != 0);
100         test2 = 1;
101         lk.unlock();
102         cv.notify_one();
103         t.join();
104     }
105     test1 = 0;
106     test2 = 0;
107     {
108         L1 lk(m0);
109         std::thread t(f);
110         assert(test1 == 0);
111         while (test1 == 0)
112             cv.wait(lk);
113         assert(test1 != 0);
114         lk.unlock();
115         t.join();
116     }
117 }
118