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bug#14569: 24.3.50; bootstrap fails on Cygwin


From: Ken Brown
Subject: bug#14569: 24.3.50; bootstrap fails on Cygwin
Date: Mon, 01 Jul 2013 10:04:00 -0400
User-agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:17.0) Gecko/20130509 Thunderbird/17.0.6

On 7/1/2013 9:51 AM, Ken Brown wrote:
On 7/1/2013 8:28 AM, Angelo Graziosi wrote:
Il 01/07/2013 13.21, Ken Brown ha scritto:

Last night I began running a loop in which emacs (patched as I proposed)
repeatedly starts and then exits after 15 seconds [*].  So far there
hasn't been a single failure after more than 1300 iterations.  I don't
know what's different about bootstrapping, but it seems that tickling
Glib doesn't cause problems on Cygwin in ordinary interactive use of
Emacs.  (Keep in mind that my previous test, quoted above, showed that
the failure during bootstrapping always occurred within 1 second after
Glib got tickled.)

If no one objects, I'll go ahead and apply my patch later today.

+1

Regarding this:

http://lists.gnu.org/archive/html/bug-gnu-emacs/2013-06/msg00963.html


shouldn't it flagged, in some manner, to Cygwin ("Creators") list? For
example,

"Bootstrapping Emacs with this patch fails on Cygwin so and so... but
not on GNU/Linux... Have you some idea?..."

After all, trying to bootstrap Emacs trunk is not so much work... The
big work, perhaps, is in understanding the failure, I think..

[Sorry, I accidentally sent an unfinished reply.  I'll restart.]

Yes, I agree in principle, but I'm not yet sure it's a Cygwin bug, and I haven't been able to come up with a simple test case that exhibits the problem. My naive attempt didn't work: I wrote a little C program that tickled Glib exactly as in process.c. I ran it thousands of times without an error. So I have to try to figure out what's different during bootstrapping. And Emacs's gmalloc.c may be part or all of the problem too. That's not compiled on GNU/Linux.

I'd like to keep trying to track this down for a while before asking on the Cygwin list.

Ken





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