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 Rep, class Period> 15 // unique_lock(mutex_type& m, const chrono::duration<Rep, Period>& rel_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 30 void f1() 31 { 32 time_point t0 = Clock::now(); 33 std::unique_lock<std::timed_mutex> lk(m, ms(300)); 34 assert(lk.owns_lock() == true); 35 time_point t1 = Clock::now(); 36 ns d = t1 - t0 - ms(250); 37 assert(d < ms(50)); // within 50ms 38 } 39 40 void f2() 41 { 42 time_point t0 = Clock::now(); 43 std::unique_lock<std::timed_mutex> lk(m, ms(250)); 44 assert(lk.owns_lock() == false); 45 time_point t1 = Clock::now(); 46 ns d = t1 - t0 - ms(250); 47 assert(d < ms(50)); // within 50ms 48 } 49 50 int main() 51 { 52 { 53 m.lock(); 54 std::thread t(f1); 55 std::this_thread::sleep_for(ms(250)); 56 m.unlock(); 57 t.join(); 58 } 59 { 60 m.lock(); 61 std::thread t(f2); 62 std::this_thread::sleep_for(ms(300)); 63 m.unlock(); 64 t.join(); 65 } 66 } 67
