[racket] SIGCHLD handler called in stderr

From: Sergey Khorev (sergey.khorev at gmail.com)
Date: Sun Dec 16 23:06:00 EST 2012

In non-places mode, Racket avoids calling waitpid() if no subprocesses

> have been started. We could improve the implementation for places so
> that the thread created to call sigwait() similarly avoids doing
> anything when the are no pending subprocesses. Would that be good
> enough?
>

I think that would help, thanks.
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