1 //===----------------------------------------------------------------------===// 2 // 3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 4 // See https://llvm.org/LICENSE.txt for license information. 5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 6 // 7 //===----------------------------------------------------------------------===// 8 // 9 // UNSUPPORTED: libcpp-has-no-threads 10 11 // ALLOW_RETRIES: 2 12 13 // <mutex> 14 15 // class mutex; 16 17 // void lock(); 18 19 #include <mutex> 20 #include <thread> 21 #include <cstdlib> 22 #include <cassert> 23 24 #include "test_macros.h" 25 26 std::mutex m; 27 28 typedef std::chrono::system_clock Clock; 29 typedef Clock::time_point time_point; 30 typedef Clock::duration duration; 31 typedef std::chrono::milliseconds ms; 32 typedef std::chrono::nanoseconds ns; 33 34 #if !TEST_SLOW_HOST() 35 ms WaitTime = ms(250); 36 ms Tolerance = ms(50); 37 #else 38 ms WaitTime = ms(750); 39 ms Tolerance = ms(200); 40 #endif 41 f()42void f() 43 { 44 time_point t0 = Clock::now(); 45 m.lock(); 46 time_point t1 = Clock::now(); 47 m.unlock(); 48 ns d = t1 - t0 - WaitTime; 49 assert(d < Tolerance); // within 50ms 50 } 51 main(int,char **)52int main(int, char**) 53 { 54 m.lock(); 55 std::thread t(f); 56 std::this_thread::sleep_for(WaitTime); 57 m.unlock(); 58 t.join(); 59 60 return 0; 61 } 62