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// bool try_lock(); 17 18#include <mutex> 19#include <thread> 20#include <cstdlib> 21#include <cassert> 22 23std::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 assert(!m.try_lock()); 35 assert(!m.try_lock()); 36 assert(!m.try_lock()); 37 while(!m.try_lock()) 38 ; 39 time_point t1 = Clock::now(); 40 m.unlock(); 41 ns d = t1 - t0 - ms(250); 42 assert(d < ms(200)); // within 200ms 43} 44 45int main() 46{ 47 m.lock(); 48 std::thread t(f); 49 std::this_thread::sleep_for(ms(250)); 50 m.unlock(); 51 t.join(); 52} 53