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From: Eli Zaretskii <eliz@gnu.org>
Newsgroups: gmane.emacs.devel
Subject: Re: busyloop in sigchld_handler
Date: Sun, 11 Mar 2007 23:14:01 +0200
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> From: Sam Steingold <sds@gnu.org>
> Date: Sun, 11 Mar 2007 17:06:07 -0400
> 
> > But can you explain why it works?
> 
> wait3 is a system call, which, when invoked in a loop, prevents the
> kernel from doing anything else (in this case, sending SIGCHLD to
> emacs). sleep allows the kernel some time to pass the signal.

So how portable is this trick?