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 // template <class Clock, class Duration> 15 // bool try_lock_until(const chrono::time_point<Clock, Duration>& abs_time); 16 17 #include <mutex> 18 #include <thread> 19 #include <cstdlib> 20 #include <cassert> 21 22 std::timed_mutex m; 23 24 typedef std::chrono::steady_clock Clock; 25 typedef Clock::time_point time_point; 26 typedef Clock::duration duration; 27 typedef std::chrono::milliseconds ms; 28 typedef std::chrono::nanoseconds ns; 29 f1()30void f1() 31 { 32 time_point t0 = Clock::now(); 33 assert(m.try_lock_until(Clock::now() + ms(300)) == true); 34 time_point t1 = Clock::now(); 35 m.unlock(); 36 ns d = t1 - t0 - ms(250); 37 assert(d < ms(50)); // within 50ms 38 } 39 f2()40void f2() 41 { 42 time_point t0 = Clock::now(); 43 assert(m.try_lock_until(Clock::now() + ms(250)) == false); 44 time_point t1 = Clock::now(); 45 ns d = t1 - t0 - ms(250); 46 assert(d < ms(50)); // within 50ms 47 } 48 main()49int main() 50 { 51 { 52 m.lock(); 53 std::thread t(f1); 54 std::this_thread::sleep_for(ms(250)); 55 m.unlock(); 56 t.join(); 57 } 58 { 59 m.lock(); 60 std::thread t(f2); 61 std::this_thread::sleep_for(ms(300)); 62 m.unlock(); 63 t.join(); 64 } 65 } 66