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Re: busyloop in sigchld_handler


From: Sam Steingold
Subject: Re: busyloop in sigchld_handler
Date: Sun, 11 Mar 2007 18:21:42 -0400
User-agent: Gnus/5.11 (Gnus v5.11) Emacs/22.0.95 (gnu/linux)

> * Eli Zaretskii <address@hidden> [2007-03-11 23:51:57 +0200]:
>
>> Date: Sun, 11 Mar 2007 17:17:05 -0400
>> From: Sam Steingold <address@hidden>
>> Cc: address@hidden
>> 
>> > * Eli Zaretskii <address@hidden> [2007-03-11 23:14:01 +0200]:
>> >
>> >> From: Sam Steingold <address@hidden>
>> >> 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?
>> 
>> sleep is in POSIX.
>
> Obviously, that's not what I asked.  I asked how portable is the
> behavior of the kernel that you described in the cited text.

Sorry.
I observe the lossage only on linux.
OTOH, linux is all I have access to.


-- 
Sam Steingold (http://sds.podval.org/) on Fedora Core release 6 (Zod)
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