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// template <class Clock, class Duration> 15// bool try_lock_shared_until(const chrono::time_point<Clock, Duration>& abs_time); 16 17#include <shared_mutex> 18#include <thread> 19#include <vector> 20#include <cstdlib> 21#include <cassert> 22 23#if _LIBCPP_STD_VER > 11 24 25std::shared_timed_mutex m; 26 27typedef std::chrono::steady_clock Clock; 28typedef Clock::time_point time_point; 29typedef Clock::duration duration; 30typedef std::chrono::milliseconds ms; 31typedef std::chrono::nanoseconds ns; 32 33void f1() 34{ 35 time_point t0 = Clock::now(); 36 assert(m.try_lock_shared_until(Clock::now() + ms(300)) == true); 37 time_point t1 = Clock::now(); 38 m.unlock_shared(); 39 ns d = t1 - t0 - ms(250); 40 assert(d < ms(50)); // within 50ms 41} 42 43void f2() 44{ 45 time_point t0 = Clock::now(); 46 assert(m.try_lock_shared_until(Clock::now() + ms(250)) == false); 47 time_point t1 = Clock::now(); 48 ns d = t1 - t0 - ms(250); 49 assert(d < ms(50)); // within 50ms 50} 51 52#endif // _LIBCPP_STD_VER > 11 53 54int main() 55{ 56#if _LIBCPP_STD_VER > 11 57 { 58 m.lock(); 59 std::vector<std::thread> v; 60 for (int i = 0; i < 5; ++i) 61 v.push_back(std::thread(f1)); 62 std::this_thread::sleep_for(ms(250)); 63 m.unlock(); 64 for (auto& t : v) 65 t.join(); 66 } 67 { 68 m.lock(); 69 std::vector<std::thread> v; 70 for (int i = 0; i < 5; ++i) 71 v.push_back(std::thread(f2)); 72 std::this_thread::sleep_for(ms(300)); 73 m.unlock(); 74 for (auto& t : v) 75 t.join(); 76 } 77#endif // _LIBCPP_STD_VER > 11 78} 79