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Minimal test - lines (23, 36)

Code

nsBaseAppShell::nsBaseAppShell()
    : mSuspendNativeCount(0),
      mEventloopNestingLevel(0),
      mBlockedWait(nullptr),
      mFavorPerf(0),
      mNativeEventPending(false),
      mStarvationDelay(0),
      mSwitchTime(0),
      mLastNativeEventTime(0),
      mEventloopNestingState(eEventloopNone),
      mRunning(false),
      mExiting(false),
      mBlockNativeEvent(false),
      mProcessedGeckoEvents(false) {}

Minimal test - lines (40, 54)

Code

nsresult nsBaseAppShell::Init() {
  // Configure ourselves as an observer for the current thread:

  if (XRE_UseNativeEventProcessing()) {
    nsCOMPtr threadInt =
        do_QueryInterface(NS_GetCurrentThread());
    NS_ENSURE_STATE(threadInt);

    threadInt->SetObserver(this);
  }

  nsCOMPtr obsSvc = mozilla::services::GetObserverService();
  if (obsSvc) obsSvc->AddObserver(this, NS_XPCOM_SHUTDOWN_OBSERVER_ID, false);
  return NS_OK;
}

Minimal test - lines (57, 97)

Code

void nsBaseAppShell::NativeEventCallback() {
  if (!mNativeEventPending.exchange(false)) return;

  // If DoProcessNextNativeEvent is on the stack, then we assume that we can
  // just unwind and let nsThread::ProcessNextEvent process the next event.
  // However, if we are called from a nested native event loop (maybe via some
  // plug-in or library function), then go ahead and process Gecko events now.
  if (mEventloopNestingState == eEventloopXPCOM) {
    mEventloopNestingState = eEventloopOther;
    // XXX there is a tiny risk we will never get a new NativeEventCallback,
    // XXX see discussion in bug 389931.
    return;
  }

  // nsBaseAppShell::Run is not being used to pump events, so this may be
  // our only opportunity to process pending gecko events.

  nsIThread* thread = NS_GetCurrentThread();
  bool prevBlockNativeEvent = mBlockNativeEvent;
  if (mEventloopNestingState == eEventloopOther) {
    if (!NS_HasPendingEvents(thread)) return;
    // We're in a nested native event loop and have some gecko events to
    // process.  While doing that we block processing native events from the
    // appshell - instead, we want to get back to the nested native event
    // loop ASAP (bug 420148).
    mBlockNativeEvent = true;
  }

  IncrementEventloopNestingLevel();
  EventloopNestingState prevVal = mEventloopNestingState;
  NS_ProcessPendingEvents(thread, THREAD_EVENT_STARVATION_LIMIT);
  mProcessedGeckoEvents = true;
  mEventloopNestingState = prevVal;
  mBlockNativeEvent = prevBlockNativeEvent;

  // Continue processing pending events later (we don't want to starve the
  // embedders event loop).
  if (NS_HasPendingEvents(thread)) DoProcessMoreGeckoEvents();

  DecrementEventloopNestingLevel();
}