libcxx/test/std/thread/thread.condition/thread.condition.condvarany/wait_until.pass.cpp

   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 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 #include "make_test_thread.h"
  27 #include "test_macros.h"
  28
  29 struct Clock
  30 {
  31     typedef std::chrono::milliseconds duration;
  32     typedef duration::rep             rep;
  33     typedef duration::period          period;
  34     typedef std::chrono::time_point<Clock> time_point;
  35     static const bool is_steady =  true;
  36
  37     static time_point now()
  38     {
  39         using namespace std::chrono;
  40         return time_point(duration_cast<duration>(
  41                 steady_clock::now().time_since_epoch()
  42                                                  ));
  43     }
  44 };
  45
  46 std::condition_variable_any cv;
  47
  48 typedef std::timed_mutex L0;
  49 typedef std::unique_lock<L0> L1;
  50
  51 L0 m0;
  52
  53 int test1 = 0;
  54 int test2 = 0;
  55
  56 int runs = 0;
  57
  58 void f()
  59 {
  60     L1 lk(m0);
  61     assert(test2 == 0);
  62     test1 = 1;
  63     cv.notify_one();
  64     Clock::time_point t0 = Clock::now();
  65     Clock::time_point t = t0 + Clock::duration(250);
  66     while (test2 == 0 && cv.wait_until(lk, t) == std::cv_status::no_timeout)
  67         ;
  68     Clock::time_point t1 = Clock::now();
  69     if (runs == 0)
  70     {
  71         assert(t1 - t0 < Clock::duration(250));
  72         assert(test2 != 0);
  73     }
  74     else
  75     {
  76         assert(t1 - t0 - Clock::duration(250) < Clock::duration(50));
  77         assert(test2 == 0);
  78     }
  79     ++runs;
  80 }
  81
  82 int main(int, char**)
  83 {
  84     {
  85         L1 lk(m0);
  86         std::thread t = support::make_test_thread(f);
  87         assert(test1 == 0);
  88         while (test1 == 0)
  89             cv.wait(lk);
  90         assert(test1 != 0);
  91         test2 = 1;
  92         lk.unlock();
  93         cv.notify_one();
  94         t.join();
  95     }
  96     test1 = 0;
  97     test2 = 0;
  98     {
  99         L1 lk(m0);
 100         std::thread t = support::make_test_thread(f);
 101         assert(test1 == 0);
 102         while (test1 == 0)
 103             cv.wait(lk);
 104         assert(test1 != 0);
 105         lk.unlock();
 106         t.join();
 107     }
 108
 109   return 0;
 110 }