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 timed_mutex; 13 14 // template <class Rep, class Period> 15 // shared_lock(mutex_type& m, 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 std::shared_lock<std::shared_timed_mutex> lk(m, ms(300)); 37 assert(lk.owns_lock() == true); 38 time_point t1 = Clock::now(); 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 std::shared_lock<std::shared_timed_mutex> lk(m, ms(250)); 47 assert(lk.owns_lock() == false); 48 time_point t1 = Clock::now(); 49 ns d = t1 - t0 - ms(250); 50 assert(d < ms(50)); // within 50ms 51 } 52 53 #endif // _LIBCPP_STD_VER > 11 54 55 int main() 56 { 57 #if _LIBCPP_STD_VER > 11 58 { 59 m.lock(); 60 std::vector<std::thread> v; 61 for (int i = 0; i < 5; ++i) 62 v.push_back(std::thread(f1)); 63 std::this_thread::sleep_for(ms(250)); 64 m.unlock(); 65 for (auto& t : v) 66 t.join(); 67 } 68 { 69 m.lock(); 70 std::vector<std::thread> v; 71 for (int i = 0; i < 5; ++i) 72 v.push_back(std::thread(f2)); 73 std::this_thread::sleep_for(ms(300)); 74 m.unlock(); 75 for (auto& t : v) 76 t.join(); 77 } 78 #endif // _LIBCPP_STD_VER > 11 79 } 80
