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 Rep, class Period> 15 // bool try_lock_shared_for(const chrono::duration<Rep, Period>& rel_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 25 std::shared_timed_mutex m; 26 27 typedef std::chrono::steady_clock Clock; 28 typedef Clock::time_point time_point; 29 typedef Clock::duration duration; 30 typedef std::chrono::milliseconds ms; 31 typedef std::chrono::nanoseconds ns; 32 33 void f1() 34 { 35 time_point t0 = Clock::now(); 36 assert(m.try_lock_shared_for(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 43 void f2() 44 { 45 time_point t0 = Clock::now(); 46 assert(m.try_lock_shared_for(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 54 int 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
