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Re: Thread-safe error location in maintainer mode

From: Ivan Zhakov <ivan_at_visualsvn.com>
Date: Wed, 4 Mar 2015 15:50:49 +0300

On 4 March 2015 at 11:27, Branko Čibej <brane_at_wandisco.com> wrote:
> There was some discussion on #svn-dev recently about making the error
> location tracing (see libsvn_subr/error.c and svn_error__locate)
> thread-safe, by using platform- and compiler-specific flags for making
> the location variables thread-safe.
> It turns out that, since we now require APR 1.3+ which provides
> unmanaged pools, we can now safely do this by using APR's threadkey API.
> See:
> https://paste.apache.org/fG82
> With this patch, all tests pass for on my Mac in parallel mode and the
> error stacks look sane. But, before committing the change, I'd like
> someone else to review the patch because it's just a wee bit tricky in
> places what with all the #ifdefs.
I was thinking about similar change, but as far I remember it's not
safe to use svn_atomic__init_once() in error.c, because
svn_atomic__init_once() uses svn_error_*() API. This may lead circular
initialization of svn_error_*() tracing infrastructure.

Ivan Zhakov
Received on 2015-03-04 13:51:37 CET

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