Yes, I thought about that. But the child thread is doing more than just executing the command. It is also logging the output, start, stop, status.... I'd like the child thread to ultimately send the signal to external program so that it can also record the fact in my log.
But that's all okay because now the child thread is running asychonously and I can move the timer from the parent down to the child. So in essence, the parent no longer needs to signal the child, and logically you are right that we don't need to be another level deep, but that I am really moving down a level in my hierarchy of threads.
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