1bc8d3f97eb5c958007f2713238472e0c1c8fe02Howard Hinnant//===----------------------------------------------------------------------===// 2bc8d3f97eb5c958007f2713238472e0c1c8fe02Howard Hinnant// 3f5256e16dfc425c1d466f6308d4026d529ce9e0bHoward Hinnant// The LLVM Compiler Infrastructure 4bc8d3f97eb5c958007f2713238472e0c1c8fe02Howard Hinnant// 5b64f8b07c104c6cc986570ac8ee0ed16a9f23976Howard Hinnant// This file is dual licensed under the MIT and the University of Illinois Open 6b64f8b07c104c6cc986570ac8ee0ed16a9f23976Howard Hinnant// Source Licenses. See LICENSE.TXT for details. 7bc8d3f97eb5c958007f2713238472e0c1c8fe02Howard Hinnant// 8bc8d3f97eb5c958007f2713238472e0c1c8fe02Howard Hinnant//===----------------------------------------------------------------------===// 9bc8d3f97eb5c958007f2713238472e0c1c8fe02Howard Hinnant 10bc8d3f97eb5c958007f2713238472e0c1c8fe02Howard Hinnant// <mutex> 11bc8d3f97eb5c958007f2713238472e0c1c8fe02Howard Hinnant 12bc8d3f97eb5c958007f2713238472e0c1c8fe02Howard Hinnant// template <class Mutex> class unique_lock; 13bc8d3f97eb5c958007f2713238472e0c1c8fe02Howard Hinnant 14bc8d3f97eb5c958007f2713238472e0c1c8fe02Howard Hinnant// template <class Clock, class Duration> 15bc8d3f97eb5c958007f2713238472e0c1c8fe02Howard Hinnant// bool try_lock_until(const chrono::time_point<Clock, Duration>& abs_time); 16bc8d3f97eb5c958007f2713238472e0c1c8fe02Howard Hinnant 17bc8d3f97eb5c958007f2713238472e0c1c8fe02Howard Hinnant#include <mutex> 18bc8d3f97eb5c958007f2713238472e0c1c8fe02Howard Hinnant#include <cassert> 19bc8d3f97eb5c958007f2713238472e0c1c8fe02Howard Hinnant 20bc8d3f97eb5c958007f2713238472e0c1c8fe02Howard Hinnantbool try_lock_until_called = false; 21bc8d3f97eb5c958007f2713238472e0c1c8fe02Howard Hinnant 22bc8d3f97eb5c958007f2713238472e0c1c8fe02Howard Hinnantstruct mutex 23bc8d3f97eb5c958007f2713238472e0c1c8fe02Howard Hinnant{ 24bc8d3f97eb5c958007f2713238472e0c1c8fe02Howard Hinnant template <class Clock, class Duration> 25bc8d3f97eb5c958007f2713238472e0c1c8fe02Howard Hinnant bool try_lock_until(const std::chrono::time_point<Clock, Duration>& abs_time) 26bc8d3f97eb5c958007f2713238472e0c1c8fe02Howard Hinnant { 27bc8d3f97eb5c958007f2713238472e0c1c8fe02Howard Hinnant typedef std::chrono::milliseconds ms; 28bc8d3f97eb5c958007f2713238472e0c1c8fe02Howard Hinnant assert(Clock::now() - abs_time < ms(5)); 29bc8d3f97eb5c958007f2713238472e0c1c8fe02Howard Hinnant try_lock_until_called = !try_lock_until_called; 30bc8d3f97eb5c958007f2713238472e0c1c8fe02Howard Hinnant return try_lock_until_called; 31bc8d3f97eb5c958007f2713238472e0c1c8fe02Howard Hinnant } 32bc8d3f97eb5c958007f2713238472e0c1c8fe02Howard Hinnant void unlock() {} 33bc8d3f97eb5c958007f2713238472e0c1c8fe02Howard Hinnant}; 34bc8d3f97eb5c958007f2713238472e0c1c8fe02Howard Hinnant 35bc8d3f97eb5c958007f2713238472e0c1c8fe02Howard Hinnantmutex m; 36bc8d3f97eb5c958007f2713238472e0c1c8fe02Howard Hinnant 37bc8d3f97eb5c958007f2713238472e0c1c8fe02Howard Hinnantint main() 38bc8d3f97eb5c958007f2713238472e0c1c8fe02Howard Hinnant{ 39f8f852138f86e4588916021e1afedfcab25298c0Howard Hinnant typedef std::chrono::steady_clock Clock; 40bc8d3f97eb5c958007f2713238472e0c1c8fe02Howard Hinnant std::unique_lock<mutex> lk(m, std::defer_lock); 41bc8d3f97eb5c958007f2713238472e0c1c8fe02Howard Hinnant assert(lk.try_lock_until(Clock::now()) == true); 42bc8d3f97eb5c958007f2713238472e0c1c8fe02Howard Hinnant assert(try_lock_until_called == true); 43bc8d3f97eb5c958007f2713238472e0c1c8fe02Howard Hinnant assert(lk.owns_lock() == true); 44bc8d3f97eb5c958007f2713238472e0c1c8fe02Howard Hinnant try 45bc8d3f97eb5c958007f2713238472e0c1c8fe02Howard Hinnant { 46bc8d3f97eb5c958007f2713238472e0c1c8fe02Howard Hinnant lk.try_lock_until(Clock::now()); 47bc8d3f97eb5c958007f2713238472e0c1c8fe02Howard Hinnant assert(false); 48bc8d3f97eb5c958007f2713238472e0c1c8fe02Howard Hinnant } 49bc8d3f97eb5c958007f2713238472e0c1c8fe02Howard Hinnant catch (std::system_error& e) 50bc8d3f97eb5c958007f2713238472e0c1c8fe02Howard Hinnant { 51bc8d3f97eb5c958007f2713238472e0c1c8fe02Howard Hinnant assert(e.code().value() == EDEADLK); 52bc8d3f97eb5c958007f2713238472e0c1c8fe02Howard Hinnant } 53bc8d3f97eb5c958007f2713238472e0c1c8fe02Howard Hinnant lk.unlock(); 54bc8d3f97eb5c958007f2713238472e0c1c8fe02Howard Hinnant assert(lk.try_lock_until(Clock::now()) == false); 55bc8d3f97eb5c958007f2713238472e0c1c8fe02Howard Hinnant assert(try_lock_until_called == false); 56bc8d3f97eb5c958007f2713238472e0c1c8fe02Howard Hinnant assert(lk.owns_lock() == false); 57bc8d3f97eb5c958007f2713238472e0c1c8fe02Howard Hinnant lk.release(); 58bc8d3f97eb5c958007f2713238472e0c1c8fe02Howard Hinnant try 59bc8d3f97eb5c958007f2713238472e0c1c8fe02Howard Hinnant { 60bc8d3f97eb5c958007f2713238472e0c1c8fe02Howard Hinnant lk.try_lock_until(Clock::now()); 61bc8d3f97eb5c958007f2713238472e0c1c8fe02Howard Hinnant assert(false); 62bc8d3f97eb5c958007f2713238472e0c1c8fe02Howard Hinnant } 63bc8d3f97eb5c958007f2713238472e0c1c8fe02Howard Hinnant catch (std::system_error& e) 64bc8d3f97eb5c958007f2713238472e0c1c8fe02Howard Hinnant { 65bc8d3f97eb5c958007f2713238472e0c1c8fe02Howard Hinnant assert(e.code().value() == EPERM); 66bc8d3f97eb5c958007f2713238472e0c1c8fe02Howard Hinnant } 67bc8d3f97eb5c958007f2713238472e0c1c8fe02Howard Hinnant} 68