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 // UNSUPPORTED: libcpp-has-no-threads 11 // UNSUPPORTED: c++03, c++98, c++11 12 13 // <shared_mutex> 14 15 // class shared_timed_mutex; 16 17 // void lock_shared(); 18 19 #include <shared_mutex> 20 #include <thread> 21 #include <vector> 22 #include <cstdlib> 23 #include <cassert> 24 25 std::shared_timed_mutex m; 26 27 typedef std::chrono::system_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 f() 34 { 35 time_point t0 = Clock::now(); 36 m.lock_shared(); 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 g() 44 { 45 time_point t0 = Clock::now(); 46 m.lock_shared(); 47 time_point t1 = Clock::now(); 48 m.unlock_shared(); 49 ns d = t1 - t0; 50 assert(d < ms(50)); // within 50ms 51 } 52 53 54 int main() 55 { 56 m.lock(); 57 std::vector<std::thread> v; 58 for (int i = 0; i < 5; ++i) 59 v.push_back(std::thread(f)); 60 std::this_thread::sleep_for(ms(250)); 61 m.unlock(); 62 for (auto& t : v) 63 t.join(); 64 m.lock_shared(); 65 for (auto& t : v) 66 t = std::thread(g); 67 std::thread q(f); 68 std::this_thread::sleep_for(ms(250)); 69 m.unlock_shared(); 70 for (auto& t : v) 71 t.join(); 72 q.join(); 73 } 74
