/**
* Calls {@link #destroy()} directly if the following requirements are met:
*
* <ul>
* <li>An {@link GLAnimatorControl} is bound (see {@link #getAnimator()}) and running on another
* thread. Here we pause the animation while issuing the destruction.
* <li>Surface is not locked by another thread (considered anonymous).
* </ul>
*
* <p>Otherwise destroy is being flagged to be called within the next call of display().
*
* <p>This method is being used to avoid deadlock if destruction is desired by <i>other</i>
* threads, e.g. the window manager.
*
* @see #defaultWindowDestroyNotifyOp()
* @see #defaultDisplay()
*/
protected final void destroyAvoidAwareOfLocking() {
final NativeSurface ns = getNativeSurface();
final GLAnimatorControl ctrl = helper.getAnimator();
// Is an animator thread perform rendering?
if (helper.isAnimatorStartedOnOtherThread()) {
// Pause animations before initiating safe destroy.
final boolean isPaused = ctrl.pause();
destroy();
if (isPaused) {
ctrl.resume();
}
} else if (null != ns && ns.isSurfaceLockedByOtherThread()) {
// Surface is locked by another thread.
// Flag that destroy should be performed on the next
// attempt to display.
sendDestroy = true; // async, but avoiding deadlock
} else {
// Without an external thread animating or locking the
// surface, we are safe.
destroy();
}
}
