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 // <shared_mutex> 11 12 // class shared_timed_mutex; 13 14 // void lock(); 15 16 #include <shared_mutex> 17 #include <thread> 18 #include <cstdlib> 19 #include <cassert> 20 21 #if _LIBCPP_STD_VER > 11 22 23 std::shared_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 #endif // _LIBCPP_STD_VER > 11 42 43 int main() 44 { 45 #if _LIBCPP_STD_VER > 11 46 m.lock(); 47 std::thread t(f); 48 std::this_thread::sleep_for(ms(250)); 49 m.unlock(); 50 t.join(); 51 #endif // _LIBCPP_STD_VER > 11 52 } 53
