libcxx/test/std/thread/thread.condition/thread.condition.condvarany/wait_for.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 Rep, class Period>
  17 //   cv_status
  18 //   wait_for(Lock& lock, const chrono::duration<Rep, Period>& rel_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 std::condition_variable_any cv;
  30
  31 typedef std::timed_mutex L0;
  32 typedef std::unique_lock<L0> L1;
  33
  34 L0 m0;
  35
  36 int test1 = 0;
  37 int test2 = 0;
  38
  39 bool expect_timeout = false;
  40
  41 void f()
  42 {
  43     typedef std::chrono::system_clock Clock;
  44     typedef std::chrono::milliseconds milliseconds;
  45     L1 lk(m0);
  46     assert(test2 == 0);
  47     test1 = 1;
  48     cv.notify_one();
  49     Clock::time_point t0 = Clock::now();
  50     Clock::time_point wait_end = t0 + milliseconds(250);
  51     Clock::duration d;
  52     do {
  53         d = wait_end - Clock::now();
  54         if (d <= milliseconds(0)) break;
  55     } while (test2 == 0 && cv.wait_for(lk, d) == std::cv_status::no_timeout);
  56     Clock::time_point t1 = Clock::now();
  57     if (!expect_timeout)
  58     {
  59         assert(t1 - t0 < milliseconds(250));
  60         assert(test2 != 0);
  61     }
  62     else
  63     {
  64         assert(t1 - t0 - milliseconds(250) < milliseconds(50));
  65         assert(test2 == 0);
  66     }
  67 }
  68
  69 int main(int, char**)
  70 {
  71     {
  72         L1 lk(m0);
  73         std::thread t = support::make_test_thread(f);
  74         assert(test1 == 0);
  75         while (test1 == 0)
  76             cv.wait(lk);
  77         assert(test1 != 0);
  78         test2 = 1;
  79         lk.unlock();
  80         cv.notify_one();
  81         t.join();
  82     }
  83     test1 = 0;
  84     test2 = 0;
  85     expect_timeout = true;
  86     {
  87         L1 lk(m0);
  88         std::thread t = support::make_test_thread(f);
  89         assert(test1 == 0);
  90         while (test1 == 0)
  91             cv.wait(lk);
  92         assert(test1 != 0);
  93         lk.unlock();
  94         t.join();
  95     }
  96
  97   return 0;
  98 }