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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 // <mutex>
     11 
     12 // class timed_mutex;
     13 
     14 // void lock();
     15 
     16 #include <mutex>
     17 #include <thread>
     18 #include <cstdlib>
     19 #include <cassert>
     20 
     21 #include <iostream>
     22 
     23 std::timed_mutex m;
     24 
     25 typedef std::chrono::system_clock Clock;
     26 typedef Clock::time_point time_point;
     27 typedef Clock::duration duration;
     28 typedef std::chrono::milliseconds ms;
     29 typedef std::chrono::nanoseconds ns;
     30 
     31 void f()
     32 {
     33     time_point t0 = Clock::now();
     34     m.lock();
     35     time_point t1 = Clock::now();
     36     m.unlock();
     37     ns d = t1 - t0 - ms(250);
     38     assert(d < ms(50));  // within 50ms
     39 }
     40 
     41 int main()
     42 {
     43     m.lock();
     44     std::thread t(f);
     45     std::this_thread::sleep_for(ms(250));
     46     m.unlock();
     47     t.join();
     48 }
     49