Giampaolo Rodola' added the comment:

> The new asyncio module doesn't have this performance issue
> On Unix, the default implementation sets an handler for SIGCHLD signal which 
> calls waitpid(pid, WNOHANG) on all processes to detect process exit. But it 
> has 
> also a faster implementation which calls waitpid(-1, WNOHANG) only once.

But that is still a busy loop, no?
My understanding was that the goal of this ticket was to figure out a strategy 
to get rid of that.

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<http://bugs.python.org/issue12187>
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