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 // void lock(); 19 20 #include <mutex> 21 #include <thread> 22 #include <cstdlib> 23 #include <cassert> 24 25 #include "test_macros.h" 26 27 std::mutex m; 28 29 typedef std::chrono::system_clock Clock; 30 typedef Clock::time_point time_point; 31 typedef Clock::duration duration; 32 typedef std::chrono::milliseconds ms; 33 typedef std::chrono::nanoseconds ns; 34 35 void f() 36 { 37 std::unique_lock<std::mutex> lk(m, std::defer_lock); 38 time_point t0 = Clock::now(); 39 lk.lock(); 40 time_point t1 = Clock::now(); 41 assert(lk.owns_lock() == true); 42 ns d = t1 - t0 - ms(250); 43 assert(d < ms(25)); // within 25ms 44 #ifndef TEST_HAS_NO_EXCEPTIONS 45 try 46 { 47 lk.lock(); 48 assert(false); 49 } 50 catch (std::system_error& e) 51 { 52 assert(e.code().value() == EDEADLK); 53 } 54 #endif 55 lk.unlock(); 56 lk.release(); 57 #ifndef TEST_HAS_NO_EXCEPTIONS 58 try 59 { 60 lk.lock(); 61 assert(false); 62 } 63 catch (std::system_error& e) 64 { 65 assert(e.code().value() == EPERM); 66 } 67 #endif 68 } 69 70 int main() 71 { 72 m.lock(); 73 std::thread t(f); 74 std::this_thread::sleep_for(ms(250)); 75 m.unlock(); 76 t.join(); 77 } 78
