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Re: busyloop in sigchld_handler

From: Andreas Schwab
Subject: Re: busyloop in sigchld_handler
Date: Mon, 12 Mar 2007 18:37:55 +0100
User-agent: Gnus/5.110006 (No Gnus v0.6) Emacs/22.0.91 (gnu/linux)

Sam Steingold <address@hidden> writes:

> 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.

I don't find this explanation convincing at all.  Since the system call is
made _inside_ the signal handler, the signal is actually blocked here, so
it cannot be delivered anyway.


Andreas Schwab, SuSE Labs, address@hidden
SuSE Linux Products GmbH, Maxfeldstraße 5, 90409 Nürnberg, Germany
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