mutex.pass.cpp (1410B)
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 12 // FLAKY_TEST 13 14 // <mutex> 15 16 // template <class Mutex> class unique_lock; 17 18 // explicit unique_lock(mutex_type& m); 19 20 // template<class _Mutex> unique_lock(unique_lock<_Mutex>) 21 // -> unique_lock<_Mutex>; // C++17 22 23 #include <mutex> 24 #include <thread> 25 #include <cstdlib> 26 #include <cassert> 27 28 #include "test_macros.h" 29 30 std::mutex m; 31 32 typedef std::chrono::system_clock Clock; 33 typedef Clock::time_point time_point; 34 typedef Clock::duration duration; 35 typedef std::chrono::milliseconds ms; 36 typedef std::chrono::nanoseconds ns; 37 38 void f() 39 { 40 time_point t0 = Clock::now(); 41 time_point t1; 42 { 43 std::unique_lock<std::mutex> ul(m); 44 t1 = Clock::now(); 45 } 46 ns d = t1 - t0 - ms(250); 47 assert(d < ms(50)); // within 50ms 48 } 49 50 int main() 51 { 52 m.lock(); 53 std::thread t(f); 54 std::this_thread::sleep_for(ms(250)); 55 m.unlock(); 56 t.join(); 57 58 #ifdef __cpp_deduction_guides 59 std::unique_lock ul(m); 60 static_assert((std::is_same<decltype(ul), std::unique_lock<decltype(m)>>::value), "" ); 61 #endif 62 }