Disable enqueuing to this queue. Return 0 on success, and a non‐zero value otherwise. This method will fail (with an error) if prepareForDeletion has already been called on this object.
Disable enqueuing to this queue. Return 0 on success, and a non‐zero value otherwise. This method will fail (with an error) if prepareForDeletion has already been called on this object.