Home | History | Annotate | Download | only in thread.condition.condvarany 
      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 Clock, class Duration>
     17 //   cv_status
     18 //   wait_until(Lock& lock, const chrono::time_point<Clock, Duration>& abs_time);
     19 
     20 #include <condition_variable>
     21 #include <mutex>
     22 #include <thread>
     23 #include <chrono>
     24 #include <cassert>
     25 
     26 struct Clock
     27 {
     28     typedef std::chrono::milliseconds duration;
     29     typedef duration::rep             rep;
     30     typedef duration::period          period;
     31     typedef std::chrono::time_point<Clock> time_point;
     32     static const bool is_steady =  true;
     33 
     34     static time_point now()
     35     {
     36         using namespace std::chrono;
     37         return time_point(duration_cast<duration>(
     38                 steady_clock::now().time_since_epoch()
     39                                                  ));
     40     }
     41 };
     42 
     43 std::condition_variable_any cv;
     44 
     45 typedef std::timed_mutex L0;
     46 typedef std::unique_lock<L0> L1;
     47 
     48 L0 m0;
     49 
     50 int test1 = 0;
     51 int test2 = 0;
     52 
     53 int runs = 0;
     54 
     55 void f()
     56 {
     57     L1 lk(m0);
     58     assert(test2 == 0);
     59     test1 = 1;
     60     cv.notify_one();
     61     Clock::time_point t0 = Clock::now();
     62     Clock::time_point t = t0 + Clock::duration(250);
     63     while (test2 == 0 && cv.wait_until(lk, t) == std::cv_status::no_timeout)
     64         ;
     65     Clock::time_point t1 = Clock::now();
     66     if (runs == 0)
     67     {
     68         assert(t1 - t0 < Clock::duration(250));
     69         assert(test2 != 0);
     70     }
     71     else
     72     {
     73         assert(t1 - t0 - Clock::duration(250) < Clock::duration(50));
     74         assert(test2 == 0);
     75     }
     76     ++runs;
     77 }
     78 
     79 int main()
     80 {
     81     {
     82         L1 lk(m0);
     83         std::thread t(f);
     84         assert(test1 == 0);
     85         while (test1 == 0)
     86             cv.wait(lk);
     87         assert(test1 != 0);
     88         test2 = 1;
     89         lk.unlock();
     90         cv.notify_one();
     91         t.join();
     92     }
     93     test1 = 0;
     94     test2 = 0;
     95     {
     96         L1 lk(m0);
     97         std::thread t(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