1ba898e42081aec544a04d282834aa99b13d57803Howard Hinnant//===----------------------------------------------------------------------===// 2ba898e42081aec544a04d282834aa99b13d57803Howard Hinnant// 3ba898e42081aec544a04d282834aa99b13d57803Howard Hinnant// The LLVM Compiler Infrastructure 4ba898e42081aec544a04d282834aa99b13d57803Howard Hinnant// 5ba898e42081aec544a04d282834aa99b13d57803Howard Hinnant// This file is dual licensed under the MIT and the University of Illinois Open 6ba898e42081aec544a04d282834aa99b13d57803Howard Hinnant// Source Licenses. See LICENSE.TXT for details. 7ba898e42081aec544a04d282834aa99b13d57803Howard Hinnant// 8ba898e42081aec544a04d282834aa99b13d57803Howard Hinnant//===----------------------------------------------------------------------===// 9ba898e42081aec544a04d282834aa99b13d57803Howard Hinnant 10ba898e42081aec544a04d282834aa99b13d57803Howard Hinnant// <shared_mutex> 11ba898e42081aec544a04d282834aa99b13d57803Howard Hinnant 12ba898e42081aec544a04d282834aa99b13d57803Howard Hinnant// template <class Mutex> class shared_lock; 13ba898e42081aec544a04d282834aa99b13d57803Howard Hinnant 14ba898e42081aec544a04d282834aa99b13d57803Howard Hinnant// void lock(); 15ba898e42081aec544a04d282834aa99b13d57803Howard Hinnant 16ba898e42081aec544a04d282834aa99b13d57803Howard Hinnant#include <shared_mutex> 17ba898e42081aec544a04d282834aa99b13d57803Howard Hinnant#include <thread> 18ba898e42081aec544a04d282834aa99b13d57803Howard Hinnant#include <vector> 19ba898e42081aec544a04d282834aa99b13d57803Howard Hinnant#include <cstdlib> 20ba898e42081aec544a04d282834aa99b13d57803Howard Hinnant#include <cassert> 21ba898e42081aec544a04d282834aa99b13d57803Howard Hinnant 22ba898e42081aec544a04d282834aa99b13d57803Howard Hinnant#if _LIBCPP_STD_VER > 11 23ba898e42081aec544a04d282834aa99b13d57803Howard Hinnant 24f9f95be93091c60e7c9034670f298d5a2fba8686David Majnemerstd::shared_timed_mutex m; 25ba898e42081aec544a04d282834aa99b13d57803Howard Hinnant 26ba898e42081aec544a04d282834aa99b13d57803Howard Hinnanttypedef std::chrono::system_clock Clock; 27ba898e42081aec544a04d282834aa99b13d57803Howard Hinnanttypedef Clock::time_point time_point; 28ba898e42081aec544a04d282834aa99b13d57803Howard Hinnanttypedef Clock::duration duration; 29ba898e42081aec544a04d282834aa99b13d57803Howard Hinnanttypedef std::chrono::milliseconds ms; 30ba898e42081aec544a04d282834aa99b13d57803Howard Hinnanttypedef std::chrono::nanoseconds ns; 31ba898e42081aec544a04d282834aa99b13d57803Howard Hinnant 32ba898e42081aec544a04d282834aa99b13d57803Howard Hinnantvoid f() 33ba898e42081aec544a04d282834aa99b13d57803Howard Hinnant{ 34f9f95be93091c60e7c9034670f298d5a2fba8686David Majnemer std::shared_lock<std::shared_timed_mutex> lk(m, std::defer_lock); 35ba898e42081aec544a04d282834aa99b13d57803Howard Hinnant time_point t0 = Clock::now(); 36ba898e42081aec544a04d282834aa99b13d57803Howard Hinnant lk.lock(); 37ba898e42081aec544a04d282834aa99b13d57803Howard Hinnant time_point t1 = Clock::now(); 38ba898e42081aec544a04d282834aa99b13d57803Howard Hinnant assert(lk.owns_lock() == true); 39ba898e42081aec544a04d282834aa99b13d57803Howard Hinnant ns d = t1 - t0 - ms(250); 40ba898e42081aec544a04d282834aa99b13d57803Howard Hinnant assert(d < ms(25)); // within 25ms 41ba898e42081aec544a04d282834aa99b13d57803Howard Hinnant try 42ba898e42081aec544a04d282834aa99b13d57803Howard Hinnant { 43ba898e42081aec544a04d282834aa99b13d57803Howard Hinnant lk.lock(); 44ba898e42081aec544a04d282834aa99b13d57803Howard Hinnant assert(false); 45ba898e42081aec544a04d282834aa99b13d57803Howard Hinnant } 46ba898e42081aec544a04d282834aa99b13d57803Howard Hinnant catch (std::system_error& e) 47ba898e42081aec544a04d282834aa99b13d57803Howard Hinnant { 48ba898e42081aec544a04d282834aa99b13d57803Howard Hinnant assert(e.code().value() == EDEADLK); 49ba898e42081aec544a04d282834aa99b13d57803Howard Hinnant } 50ba898e42081aec544a04d282834aa99b13d57803Howard Hinnant lk.unlock(); 51ba898e42081aec544a04d282834aa99b13d57803Howard Hinnant lk.release(); 52ba898e42081aec544a04d282834aa99b13d57803Howard Hinnant try 53ba898e42081aec544a04d282834aa99b13d57803Howard Hinnant { 54ba898e42081aec544a04d282834aa99b13d57803Howard Hinnant lk.lock(); 55ba898e42081aec544a04d282834aa99b13d57803Howard Hinnant assert(false); 56ba898e42081aec544a04d282834aa99b13d57803Howard Hinnant } 57ba898e42081aec544a04d282834aa99b13d57803Howard Hinnant catch (std::system_error& e) 58ba898e42081aec544a04d282834aa99b13d57803Howard Hinnant { 59ba898e42081aec544a04d282834aa99b13d57803Howard Hinnant assert(e.code().value() == EPERM); 60ba898e42081aec544a04d282834aa99b13d57803Howard Hinnant } 61ba898e42081aec544a04d282834aa99b13d57803Howard Hinnant} 62ba898e42081aec544a04d282834aa99b13d57803Howard Hinnant 63ba898e42081aec544a04d282834aa99b13d57803Howard Hinnant#endif // _LIBCPP_STD_VER > 11 64ba898e42081aec544a04d282834aa99b13d57803Howard Hinnant 65ba898e42081aec544a04d282834aa99b13d57803Howard Hinnantint main() 66ba898e42081aec544a04d282834aa99b13d57803Howard Hinnant{ 67ba898e42081aec544a04d282834aa99b13d57803Howard Hinnant#if _LIBCPP_STD_VER > 11 68ba898e42081aec544a04d282834aa99b13d57803Howard Hinnant m.lock(); 69ba898e42081aec544a04d282834aa99b13d57803Howard Hinnant std::vector<std::thread> v; 70ba898e42081aec544a04d282834aa99b13d57803Howard Hinnant for (int i = 0; i < 5; ++i) 71ba898e42081aec544a04d282834aa99b13d57803Howard Hinnant v.push_back(std::thread(f)); 72ba898e42081aec544a04d282834aa99b13d57803Howard Hinnant std::this_thread::sleep_for(ms(250)); 73ba898e42081aec544a04d282834aa99b13d57803Howard Hinnant m.unlock(); 74ba898e42081aec544a04d282834aa99b13d57803Howard Hinnant for (auto& t : v) 75ba898e42081aec544a04d282834aa99b13d57803Howard Hinnant t.join(); 76ba898e42081aec544a04d282834aa99b13d57803Howard Hinnant#endif // _LIBCPP_STD_VER > 11 77ba898e42081aec544a04d282834aa99b13d57803Howard Hinnant} 78