//===----------------------------------------------------------------------===// // // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. // See https://llvm.org/LICENSE.txt for license information. // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception // //===----------------------------------------------------------------------===// // // UNSUPPORTED: libcpp-has-no-threads // FLAKY_TEST. // // template class lock_guard; // explicit lock_guard(mutex_type& m); // template lock_guard(lock_guard<_Mutex>) // -> lock_guard<_Mutex>; // C++17 #include #include #include #include #include "test_macros.h" std::mutex m; typedef std::chrono::system_clock Clock; typedef Clock::time_point time_point; typedef Clock::duration duration; typedef std::chrono::milliseconds ms; typedef std::chrono::nanoseconds ns; void f() { time_point t0 = Clock::now(); time_point t1; { std::lock_guard lg(m); t1 = Clock::now(); } ns d = t1 - t0 - ms(250); assert(d < ms(200)); // within 200ms } int main(int, char**) { m.lock(); std::thread t(f); std::this_thread::sleep_for(ms(250)); m.unlock(); t.join(); #ifdef __cpp_deduction_guides std::lock_guard lg(m); static_assert((std::is_same>::value), "" ); #endif return 0; }