@Override
		public void progressMessageChanged(long id, I item, String message) {
			listener1.progressMessageChanged(id, item, message);
			listener2.progressMessageChanged(id, item, message);
		}
Cancels all running tasks and disposes of the internal thread pool if it is a private
pool.
Ghidra/Framework/Generic/src/main/java/generic/concurrent/ConcurrentQ.java