//===----------------------------------------------------------------------===// // // 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 // UNSUPPORTED: c++98, c++03, c++11 // <shared_mutex> // class shared_timed_mutex; // bool try_lock(); #include <shared_mutex> #include <thread> #include <cstdlib> #include <cassert> #include "test_macros.h" std::shared_timed_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(); assert(!m.try_lock()); assert(!m.try_lock()); assert(!m.try_lock()); while(!m.try_lock()) ; time_point t1 = Clock::now(); m.unlock(); 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(); return 0; }