Re: busyloop in sigchld_handler

[Sam Steingold <sds@gnu.org>]

> * Eli Zaretskii <ryvm@tah.bet> [2007-03-11 23:51:57 +0200]:
>
>> Date: Sun, 11 Mar 2007 17:17:05 -0400
>> From: Sam Steingold <sds@gnu.org>
>> Cc: emacs-devel@gnu.org
>> 
>> > * Eli Zaretskii <ryvm@tah.bet> [2007-03-11 23:14:01 +0200]:
>> >
>> >> 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?
>> 
>> 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.


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