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 // UNSUPPORTED: c++03, c++98, c++11 12 13 // <shared_mutex> 14 15 // class shared_timed_mutex; 16 17 // void lock(); 18 19 #include <shared_mutex> 20 #include <thread> 21 #include <cstdlib> 22 #include <cassert> 23 24 #include "test_macros.h" 25 26 std::shared_timed_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 35 ms WaitTime = ms(250); 36 37 // Thread sanitizer causes more overhead and will sometimes cause this test 38 // to fail. To prevent this we give Thread sanitizer more time to complete the 39 // test. 40 #if !TEST_HAS_FEATURE(thread_sanitizer) 41 ms Tolerance = ms(50); 42 #else 43 ms Tolerance = ms(100); 44 #endif 45 46 47 void f() 48 { 49 time_point t0 = Clock::now(); 50 m.lock(); 51 time_point t1 = Clock::now(); 52 m.unlock(); 53 ns d = t1 - t0 - ms(250); 54 assert(d < ms(50)); // within 50ms 55 } 56 57 int main() 58 { 59 m.lock(); 60 std::thread t(f); 61 std::this_thread::sleep_for(ms(250)); 62 m.unlock(); 63 t.join(); 64 } 65
