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bug#17771: 24.3.91; SIGSEGV in cleanup_vector

From: Dmitry Antipov
Subject: bug#17771: 24.3.91; SIGSEGV in cleanup_vector
Date: Wed, 18 Jun 2014 20:24:21 +0400
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:24.0) Gecko/20100101 Thunderbird/24.6.0

On 06/18/2014 08:00 PM, Stephen Berman wrote:

As I said in my followup to your patch, it did indeed prevent Emacs from
crashing, but with it C-g could not interrupt HELLO being displayed.

This can be explained. To process C-g, C code should call QUIT. If we
compare it with OS, this is something like "check for pending interrupts
and process them if needed". That's why, for example, (make-list 10000000 0)
can be interrupted with C-g. Emacs do QUIT in its own C code, but it's
impossible to arrange QUIT in external library. So, if there is a
very busy loop somewhere in fontconfig, you can't interrupt it with C-g.


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