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 recursive_timed_mutex; 15 16 // template <class Rep, class Period> 17 // bool try_lock_for(const chrono::duration<Rep, Period>& rel_time); 18 19 #include <mutex> 20 #include <thread> 21 #include <cstdlib> 22 #include <cassert> 23 24 std::recursive_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 assert(m.try_lock_for(ms(300)) == true); 36 time_point t1 = Clock::now(); 37 assert(m.try_lock()); 38 m.unlock(); 39 m.unlock(); 40 ns d = t1 - t0 - ms(250); 41 assert(d < ns(50000000)); // within 50ms 42 } 43 44 void f2() 45 { 46 time_point t0 = Clock::now(); 47 assert(m.try_lock_for(ms(250)) == false); 48 time_point t1 = Clock::now(); 49 ns d = t1 - t0 - ms(250); 50 assert(d < ns(50000000)); // within 50ms 51 } 52 53 int main() 54 { 55 { 56 m.lock(); 57 std::thread t(f1); 58 std::this_thread::sleep_for(ms(250)); 59 m.unlock(); 60 t.join(); 61 } 62 { 63 m.lock(); 64 std::thread t(f2); 65 std::this_thread::sleep_for(ms(300)); 66 m.unlock(); 67 t.join(); 68 } 69 } 70
