libcxx/test/std/thread/thread.mutex/thread.lock/thread.lock.unique/thread.lock.unique.cons/mutex_duration.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 // <mutex>
  13
  14 // class timed_mutex;
  15
  16 // template <class Rep, class Period>
  17 //   unique_lock(mutex_type& m, const chrono::duration<Rep, Period>& rel_time);
  18
  19 #include <mutex>
  20 #include <thread>
  21 #include <cstdlib>
  22 #include <cassert>
  23
  24 #include "make_test_thread.h"
  25 #include "test_macros.h"
  26
  27 std::timed_mutex m;
  28
  29 typedef std::chrono::steady_clock Clock;
  30 typedef Clock::time_point time_point;
  31 typedef Clock::duration duration;
  32 typedef std::chrono::milliseconds ms;
  33 typedef std::chrono::nanoseconds ns;
  34
  35 void f1()
  36 {
  37     time_point t0 = Clock::now();
  38     std::unique_lock<std::timed_mutex> lk(m, ms(300));
  39     assert(lk.owns_lock() == true);
  40     time_point t1 = Clock::now();
  41     ns d = t1 - t0 - ms(250);
  42     assert(d < ms(50));  // within 50ms
  43 }
  44
  45 void f2()
  46 {
  47     time_point t0 = Clock::now();
  48     std::unique_lock<std::timed_mutex> lk(m, ms(250));
  49     assert(lk.owns_lock() == false);
  50     time_point t1 = Clock::now();
  51     ns d = t1 - t0 - ms(250);
  52     assert(d < ms(50));  // within 50ms
  53 }
  54
  55 int main(int, char**)
  56 {
  57     {
  58         m.lock();
  59         std::thread t = support::make_test_thread(f1);
  60         std::this_thread::sleep_for(ms(250));
  61         m.unlock();
  62         t.join();
  63     }
  64     {
  65         m.lock();
  66         std::thread t = support::make_test_thread(f2);
  67         std::this_thread::sleep_for(ms(300));
  68         m.unlock();
  69         t.join();
  70     }
  71
  72   return 0;
  73 }