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 // void lock_shared(); 15 16 #include <shared_mutex> 17 #include <thread> 18 #include <vector> 19 #include <cstdlib> 20 #include <cassert> 21 22 #if _LIBCPP_STD_VER > 11 23 24 std::shared_timed_mutex m; 25 26 typedef std::chrono::system_clock Clock; 27 typedef Clock::time_point time_point; 28 typedef Clock::duration duration; 29 typedef std::chrono::milliseconds ms; 30 typedef std::chrono::nanoseconds ns; 31 32 void f() 33 { 34 time_point t0 = Clock::now(); 35 m.lock_shared(); 36 time_point t1 = Clock::now(); 37 m.unlock_shared(); 38 ns d = t1 - t0 - ms(250); 39 assert(d < ms(50)); // within 50ms 40 } 41 42 void g() 43 { 44 time_point t0 = Clock::now(); 45 m.lock_shared(); 46 time_point t1 = Clock::now(); 47 m.unlock_shared(); 48 ns d = t1 - t0; 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 m.lock(); 58 std::vector<std::thread> v; 59 for (int i = 0; i < 5; ++i) 60 v.push_back(std::thread(f)); 61 std::this_thread::sleep_for(ms(250)); 62 m.unlock(); 63 for (auto& t : v) 64 t.join(); 65 m.lock_shared(); 66 for (auto& t : v) 67 t = std::thread(g); 68 std::thread q(f); 69 std::this_thread::sleep_for(ms(250)); 70 m.unlock_shared(); 71 for (auto& t : v) 72 t.join(); 73 q.join(); 74 #endif // _LIBCPP_STD_VER > 11 75 } 76
