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 23std::shared_timed_mutex m; 24 25typedef std::chrono::system_clock Clock; 26typedef Clock::time_point time_point; 27typedef Clock::duration duration; 28typedef std::chrono::milliseconds ms; 29typedef std::chrono::nanoseconds ns; 30 31void 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 43int 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