Re: busyloop in sigchld_handler

[storm@cua.dk (Kim F. Storm)]

Sam Steingold <sds@gnu.org> writes:

>> * YAMAMOTO Mitsuharu <zvghuneh@zngu.f.puvon-h.np.wc> [2007-03-26 10:47:41 +0900]:
>>
>> The following change (without a ChangeLog entry) made operations using
>> subprocesses really sluggish on Mac OS X.  Is it possible to restrict
>> the workaround to the relevant platforms?
>
> sorry - this patch merely reverted another one (which did not merit a
> ChangeLog entry either :-)
>
> how about this?
> one millisecond is enough to fix my problem - does it fix yours?
>
> --- process.c	24 Mar 2007 23:02:12 -0400	1.506
> +++ process.c	25 Mar 2007 21:54:24 -0400	
> @@ -6507,7 +6507,7 @@
>               loadavg to 5-8(!) for ~10 seconds.
>               See http://thread.gmane.org/gmane.emacs.devel/67722 or
>               http://www.google.com/search?q=busyloop+in+sigchld_handler */
> -          sleep (1);
> +          usleep (1000);
>  	  errno = 0;
>  	  pid = wait3 (&w, WNOHANG | WUNTRACED, 0);
>  	}
>

Do all platforms have usleep ?

Otherwise, we need a check in configure and use

#ifdef HAVE_USLEEP
    usleep(1000);
#endif

-- 
Kim F. Storm <storm@cua.dk> http://www.cua.dk