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 // <condition_variable> 11 12 // class condition_variable_any; 13 14 // template <class Lock, class Clock, class Duration> 15 // cv_status 16 // wait_until(Lock& lock, const chrono::time_point<Clock, Duration>& abs_time); 17 18 #include <condition_variable> 19 #include <mutex> 20 #include <thread> 21 #include <chrono> 22 #include <cassert> 23 24 struct Clock 25 { 26 typedef std::chrono::milliseconds duration; 27 typedef duration::rep rep; 28 typedef duration::period period; 29 typedef std::chrono::time_point<Clock> time_point; 30 static const bool is_steady = true; 31 32 static time_point now() 33 { 34 using namespace std::chrono; 35 return time_point(duration_cast<duration>( 36 steady_clock::now().time_since_epoch() 37 )); 38 } 39 }; 40 41 std::condition_variable_any cv; 42 43 typedef std::timed_mutex L0; 44 typedef std::unique_lock<L0> L1; 45 46 L0 m0; 47 48 int test1 = 0; 49 int test2 = 0; 50 51 int runs = 0; 52 53 void f() 54 { 55 L1 lk(m0); 56 assert(test2 == 0); 57 test1 = 1; 58 cv.notify_one(); 59 Clock::time_point t0 = Clock::now(); 60 Clock::time_point t = t0 + Clock::duration(250); 61 while (test2 == 0 && cv.wait_until(lk, t) == std::cv_status::no_timeout) 62 ; 63 Clock::time_point t1 = Clock::now(); 64 if (runs == 0) 65 { 66 assert(t1 - t0 < Clock::duration(250)); 67 assert(test2 != 0); 68 } 69 else 70 { 71 assert(t1 - t0 - Clock::duration(250) < Clock::duration(50)); 72 assert(test2 == 0); 73 } 74 ++runs; 75 } 76 77 int main() 78 { 79 { 80 L1 lk(m0); 81 std::thread t(f); 82 assert(test1 == 0); 83 while (test1 == 0) 84 cv.wait(lk); 85 assert(test1 != 0); 86 test2 = 1; 87 lk.unlock(); 88 cv.notify_one(); 89 t.join(); 90 } 91 test1 = 0; 92 test2 = 0; 93 { 94 L1 lk(m0); 95 std::thread t(f); 96 assert(test1 == 0); 97 while (test1 == 0) 98 cv.wait(lk); 99 assert(test1 != 0); 100 lk.unlock(); 101 t.join(); 102 } 103 } 104
