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Date: Thu, 23 Jul 2015 09:19:13 +0200
From: Jens Gustedt <jens.gustedt@...ia.fr>
To: musl@...ts.openwall.com
Subject: Re: [PATCH] fix atexit when it is called from an atexit
handler
Am Donnerstag, den 23.07.2015, 07:54 +0200 schrieb Jens Gustedt:
> I'd think this could be done even simpler by running the handlers in
> batches. ...
I checked, the strict ordering constraints for the handlers don't
allow for such a strategy, so forget it.
Looking at the code, I am a bit uncomfortable with the idea of a
potentially unlimited number of calloc calls during exit. I think it
would be good if we could restrict the maximal number of successful
calls to atexit during exit to 32. A calloc-free strategy could be to
save head to a tmp a the beginning of processing and to provide a
`struct fl` table on the stack of __funcs_on_exit.
> A similar improvement could be done for at_quick_exit. There I think
> it makes not much sense accepting new handlers during processing. So
> the strategy could just be
>
> (i) Take the lock and save count in a tmp
> (ii) set count to 32
> (iii) unlock
> (iv) do the processing
>
> But looking at it, I think that one can even be more improved. We
> could just use count as atomic, and so we wouldn't need a lock.
> I can prepare a patch for that, if you like.
Since this is fairly simple, I just did it. Please find a new version
attached. (too much changes, a patch makes no sense.) This compiles,
but I have no code to test this.
Jens
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