GNU bug report logs - #12450
Remove configure's --without-sync-input option.

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From: Eli Zaretskii <eliz <at> gnu.org>
To: Paul Eggert <eggert <at> cs.ucla.edu>
Cc: lekktu <at> gmail.com, rms <at> gnu.org, 12450 <at> debbugs.gnu.org
Subject: bug#12450: Remove configure's --without-sync-input option.
Date: Sun, 16 Sep 2012 11:24:02 +0300

> Date: Sun, 16 Sep 2012 01:17:33 -0700
> From: Paul Eggert <eggert <at> cs.ucla.edu>
> CC: rms <at> gnu.org, 12450 <at> debbugs.gnu.org, lekktu <at> gmail.com
> 
> On 09/16/2012 01:05 AM, Eli Zaretskii wrote:
> 
> >> No, it is not used indirectly.  emacs_blocked_malloc is the only
> >> function that uses malloc_hysteresis to set __malloc_extra_blocks.
> >> And emacs_blocked_malloc is invoked only in the non-SYNC_INPUT code.
> > 
> > Which means that gmalloc.c, and any memory allocation based on that,
> > will work differently with that function removed
> 
> No, because the function is never invoked, if we assume SYNC_INPUT.

Yes, it _is_ invoked on platforms that don't use SYNC_INPUT now.

And in addition, we cannot be sure whether its non-invocation on
SYNC_INPUT platforms isn't a simple omission, because most Posix
platforms use neither gmalloc nor ralloc.c.  So, when SYNC_INPUT was
coded, it's quite possible that assignment to __malloc_extra_blocks
was omitted by mistake that never got revealed.

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