Yury Selivanov <yseliva...@gmail.com> added the comment:

> but perhaps if we go through with that we should remove MultiLoopChildWatcher 
> from 3.8 (if it's not too late to do so) instead of deprecating it.

I'll leave that up to Andrew to decide, but I'd be +1 to drop it asap, 
especially if we want to eventually deprecate watchers.  

Speaking of watchers -- big +1 from me to drop them all at some point. I would 
start as early as 3.9.

Linux has pidfd now, freebsd/macos has kqueue, windows has its own apis for 
watching processes. Threads can be the backup method for OSes that lack proper 
APIs for watching multiple processes (without using SIGCHLD etc).

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<https://bugs.python.org/issue38591>
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