| //===----------------------------------------------------------------------===// |
| // |
| // The LLVM Compiler Infrastructure |
| // |
| // This file is dual licensed under the MIT and the University of Illinois Open |
| // Source Licenses. See LICENSE.TXT for details. |
| // |
| //===----------------------------------------------------------------------===// |
| |
| // <condition_variable> |
| |
| // class condition_variable; |
| |
| // template <class Clock, class Duration> |
| // cv_status |
| // wait_until(unique_lock<mutex>& lock, |
| // const chrono::time_point<Clock, Duration>& abs_time); |
| |
| #include <condition_variable> |
| #include <mutex> |
| #include <thread> |
| #include <chrono> |
| #include <cassert> |
| |
| struct Clock |
| { |
| typedef std::chrono::milliseconds duration; |
| typedef duration::rep rep; |
| typedef duration::period period; |
| typedef std::chrono::time_point<Clock> time_point; |
| static const bool is_steady = true; |
| |
| static time_point now() |
| { |
| using namespace std::chrono; |
| return time_point(duration_cast<duration>( |
| steady_clock::now().time_since_epoch() |
| )); |
| } |
| }; |
| |
| std::condition_variable cv; |
| std::mutex mut; |
| |
| int test1 = 0; |
| int test2 = 0; |
| |
| int runs = 0; |
| |
| void f() |
| { |
| std::unique_lock<std::mutex> lk(mut); |
| assert(test2 == 0); |
| test1 = 1; |
| cv.notify_one(); |
| Clock::time_point t0 = Clock::now(); |
| Clock::time_point t = t0 + Clock::duration(250); |
| while (test2 == 0 && cv.wait_until(lk, t) == std::cv_status::no_timeout) |
| ; |
| Clock::time_point t1 = Clock::now(); |
| if (runs == 0) |
| { |
| assert(t1 - t0 < Clock::duration(250)); |
| assert(test2 != 0); |
| } |
| else |
| { |
| assert(t1 - t0 - Clock::duration(250) < Clock::duration(50)); |
| assert(test2 == 0); |
| } |
| ++runs; |
| } |
| |
| int main() |
| { |
| { |
| std::unique_lock<std::mutex>lk(mut); |
| std::thread t(f); |
| assert(test1 == 0); |
| while (test1 == 0) |
| cv.wait(lk); |
| assert(test1 != 0); |
| test2 = 1; |
| lk.unlock(); |
| cv.notify_one(); |
| t.join(); |
| } |
| test1 = 0; |
| test2 = 0; |
| { |
| std::unique_lock<std::mutex>lk(mut); |
| std::thread t(f); |
| assert(test1 == 0); |
| while (test1 == 0) |
| cv.wait(lk); |
| assert(test1 != 0); |
| lk.unlock(); |
| t.join(); |
| } |
| } |