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 recursive_timed_mutex; 13 14 // template <class Rep, class Period> 15 // bool try_lock_for(const chrono::duration<Rep, Period>& rel_time); 16 17 #include <mutex> 18 #include <thread> 19 #include <cstdlib> 20 #include <cassert> 21 22 std::recursive_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 assert(m.try_lock_for(ms(300)) == true); 34 time_point t1 = Clock::now(); 35 assert(m.try_lock()); 36 m.unlock(); 37 m.unlock(); 38 ns d = t1 - t0 - ms(250); 39 assert(d < ns(50000000)); // within 50ms 40 } 41 42 void f2() 43 { 44 time_point t0 = Clock::now(); 45 assert(m.try_lock_for(ms(250)) == false); 46 time_point t1 = Clock::now(); 47 ns d = t1 - t0 - ms(250); 48 assert(d < ns(50000000)); // within 50ms 49 } 50 51 int main() 52 { 53 { 54 m.lock(); 55 std::thread t(f1); 56 std::this_thread::sleep_for(ms(250)); 57 m.unlock(); 58 t.join(); 59 } 60 { 61 m.lock(); 62 std::thread t(f2); 63 std::this_thread::sleep_for(ms(300)); 64 m.unlock(); 65 t.join(); 66 } 67 } 68
