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Minimal test - lines (72, 106)

Code

already_AddRefed EventQueueInternal::GetEvent(
    const MutexAutoLock& aProofOfLock, mozilla::TimeDuration* aLastEventDelay) {
  if (mQueue.IsEmpty()) {
    if (aLastEventDelay) {
      *aLastEventDelay = TimeDuration();
    }
    return nullptr;
  }

#ifdef MOZ_GECKO_PROFILER
  // We always want to clear the dispatch times, even if the profiler is turned
  // off, because we want to empty the (previously-collected) dispatch times, if
  // any, from when the profiler was turned on.  We only want to do something
  // interesting with the dispatch times if the profiler is turned on, though.
  if (!mDispatchTimes.IsEmpty()) {
    TimeStamp dispatch_time = mDispatchTimes.Pop();
    if (profiler_is_active()) {
      if (!dispatch_time.IsNull()) {
        if (aLastEventDelay) {
          *aLastEventDelay = TimeStamp::Now() - dispatch_time;
        }
      }
    }
  } else if (profiler_is_active()) {
    if (aLastEventDelay) {
      // if we just turned on the profiler, we don't have dispatch
      // times for events already in the queue.
      *aLastEventDelay = TimeDuration();
    }
  }
#endif

  nsCOMPtr result = mQueue.Pop();
  return result.forget();
}

Minimal test - lines (18, 69)

Code

void EventQueueInternal::PutEvent(
    already_AddRefed&& aEvent, EventQueuePriority aPriority,
    const MutexAutoLock& aProofOfLock, mozilla::TimeDuration* aDelay) {
  nsCOMPtr event(aEvent);

  static_assert(static_cast(nsIRunnablePriority::PRIORITY_IDLE) ==
                static_cast(EventQueuePriority::Idle));
  static_assert(static_cast(nsIRunnablePriority::PRIORITY_NORMAL) ==
                static_cast(EventQueuePriority::Normal));
  static_assert(
      static_cast(nsIRunnablePriority::PRIORITY_MEDIUMHIGH) ==
      static_cast(EventQueuePriority::MediumHigh));
  static_assert(
      static_cast(nsIRunnablePriority::PRIORITY_INPUT_HIGH) ==
      static_cast(EventQueuePriority::InputHigh));
  static_assert(static_cast(nsIRunnablePriority::PRIORITY_HIGH) ==
                static_cast(EventQueuePriority::High));

  if (mForwardToTC) {
    TaskController* tc = TaskController::Get();

    TaskManager* manager = nullptr;
    if (aPriority == EventQueuePriority::InputHigh) {
      if (InputTaskManager::Get()->State() ==
          InputTaskManager::STATE_DISABLED) {
        aPriority = EventQueuePriority::Normal;
      } else {
        manager = InputTaskManager::Get();
      }
    } else if (aPriority == EventQueuePriority::DeferredTimers ||
               aPriority == EventQueuePriority::Idle) {
      manager = TaskController::Get()->GetIdleTaskManager();
    }

    tc->DispatchRunnable(event.forget(), static_cast(aPriority),
                         manager);
    return;
  }

#ifdef MOZ_GECKO_PROFILER
  // Sigh, this doesn't check if this thread is being profiled
  if (profiler_is_active()) {
    // check to see if the profiler has been enabled since the last PutEvent
    while (mDispatchTimes.Count() < mQueue.Count()) {
      mDispatchTimes.Push(TimeStamp());
    }
    mDispatchTimes.Push(aDelay ? TimeStamp::Now() - *aDelay : TimeStamp::Now());
  }
#endif

  mQueue.Push(std::move(event));
}