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      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 // <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 std::timed_mutex m;
     25 
     26 typedef std::chrono::steady_clock Clock;
     27 typedef Clock::time_point time_point;
     28 typedef Clock::duration duration;
     29 typedef std::chrono::milliseconds ms;
     30 typedef std::chrono::nanoseconds ns;
     31 
     32 void f1()
     33 {
     34     time_point t0 = Clock::now();
     35     std::unique_lock<std::timed_mutex> lk(m, ms(300));
     36     assert(lk.owns_lock() == true);
     37     time_point t1 = Clock::now();
     38     ns d = t1 - t0 - ms(250);
     39     assert(d < ms(50));  // within 50ms
     40 }
     41 
     42 void f2()
     43 {
     44     time_point t0 = Clock::now();
     45     std::unique_lock<std::timed_mutex> lk(m, ms(250));
     46     assert(lk.owns_lock() == false);
     47     time_point t1 = Clock::now();
     48     ns d = t1 - t0 - ms(250);
     49     assert(d < ms(50));  // within 50ms
     50 }
     51 
     52 int main()
     53 {
     54     {
     55         m.lock();
     56         std::thread t(f1);
     57         std::this_thread::sleep_for(ms(250));
     58         m.unlock();
     59         t.join();
     60     }
     61     {
     62         m.lock();
     63         std::thread t(f2);
     64         std::this_thread::sleep_for(ms(300));
     65         m.unlock();
     66         t.join();
     67     }
     68 }
     69