C++ (Cpp) EventQueue::SwapElements Examples

Example #1

File: CacheIOThread.cpp Project: brendandahl/positron

void CacheIOThread::LoopOneLevel(uint32_t aLevel)
{
  EventQueue events;
  events.SwapElements(mEventQueue[aLevel]);
  EventQueue::size_type length = events.Length();

  mCurrentlyExecutingLevel = aLevel;

  bool returnEvents = false;
  bool reportTelementry = true;

  EventQueue::size_type index;
  {
    MonitorAutoUnlock unlock(mMonitor);

    for (index = 0; index < length; ++index) {
      if (EventsPending(aLevel)) {
        // Somebody scheduled a new event on a lower level, break and harry
        // to execute it!  Don't forget to return what we haven't exec.
        returnEvents = true;
        break;
      }

      if (reportTelementry) {
        reportTelementry = false;
        CacheIOTelemetry::Report(aLevel, length);
      }

      // Drop any previous flagging, only an event on the current level may set
      // this flag.
      mRerunCurrentEvent = false;

      events[index]->Run();

      if (mRerunCurrentEvent) {
        // The event handler yields to higher priority events and wants to rerun.
        returnEvents = true;
        break;
      }

      // Release outside the lock.
      events[index] = nullptr;
    }
  }

  if (returnEvents)
    mEventQueue[aLevel].InsertElementsAt(0, events.Elements() + index, length - index);
}