| 20 | namespace ruy { |
| 21 | |
| 22 | void WaitUntil(const std::function<bool()>& condition, |
| 23 | const Duration& spin_duration, std::condition_variable* condvar, |
| 24 | std::mutex* mutex) { |
| 25 | // First, trivial case where the `condition` is already true; |
| 26 | if (condition()) { |
| 27 | return; |
| 28 | } |
| 29 | |
| 30 | // Then try busy-waiting. |
| 31 | const TimePoint wait_start = Now(); |
| 32 | while (Now() - wait_start < spin_duration) { |
| 33 | if (condition()) { |
| 34 | return; |
| 35 | } |
| 36 | } |
| 37 | |
| 38 | // Finally, do real passive waiting. |
| 39 | std::unique_lock<std::mutex> lock(*mutex); |
| 40 | condvar->wait(lock, condition); |
| 41 | } |
| 42 | |
| 43 | void WaitUntil(const std::function<bool()>& condition, |
| 44 | std::condition_variable* condvar, std::mutex* mutex) { |