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
28struct 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
36    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
45class Pred
46{
47    int& i_;
48public:
49    explicit Pred(int& i) : i_(i) {}
50
51    bool operator()() {return i_ != 0;}
52};
53
54std::condition_variable_any cv;
55
56typedef std::timed_mutex L0;
57typedef std::unique_lock<L0> L1;
58
59L0 m0;
60
61int test1 = 0;
62int test2 = 0;
63
64int runs = 0;
65
66void 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
91int 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