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 timed_mutex; 15 16// void lock(); 17 18#include <mutex> 19#include <thread> 20#include <cstdlib> 21#include <cassert> 22 23#include <iostream> 24 25std::timed_mutex m; 26 27typedef std::chrono::system_clock Clock; 28typedef Clock::time_point time_point; 29typedef Clock::duration duration; 30typedef std::chrono::milliseconds ms; 31typedef std::chrono::nanoseconds ns; 32 33void f() 34{ 35 time_point t0 = Clock::now(); 36 m.lock(); 37 time_point t1 = Clock::now(); 38 m.unlock(); 39 ns d = t1 - t0 - ms(250); 40 assert(d < ms(50)); // within 50ms 41} 42 43int main() 44{ 45 m.lock(); 46 std::thread t(f); 47 std::this_thread::sleep_for(ms(250)); 48 m.unlock(); 49 t.join(); 50} 51