[LyX/master] Cmake export tests: Omit next group of possible conflicts while runnig test in parallel

[Kornel Benko]

Am Wed, 19 Aug 2020 16:57:44 -0400
schrieb Scott Kostyshak <skostysh at lyx.org>:

> On Wed, Aug 19, 2020 at 10:09:36PM +0200, Kornel Benko wrote:
> > commit 4bb00e99fbc4e23075088dfdd8e3d566fbd9d187
> > Author: Kornel Benko <kornel at lyx.org>
> > Date:   Wed Aug 19 22:28:50 2020 +0200
> > 
> >     Cmake export tests: Omit next group of possible conflicts while runnig test in
> > parallel 
> >     Disable conversion cache because all lyx instances use the same cache without
> >     any locking between read and write to the cache.
> >     
> >     Thanks to Scott catching this case.
> > ---  
> 
> Thanks, Kornel. I tried to lock the cache index when writing (patch
> attached), but that's just the index file. I suppose we would need to
> lock each cache file created. I can give that an attempt if someone can
> take a look at the attached patch for the index and let me know if it
> seems like the correct approach and I can try it for the cache files
> themselves.
> 
> Before working on that, I would like to ask if it's desirable to have
> that in the core code. I don't have a feeling for whether a user is
> likely to be bitten by this. In theory, it seems that a user could be
> bitten by this issue if they just open/export the same .lyx file in more
> than one process. I'm not sure why they would do that though (perhaps by
> mistake?). Also, conditional upon being bitten by the issue, I'm not
> sure if it is that bad. I guess it could be viewed as bad if a user does
> not realize (i.e., no compilation error) if a file in the cache is
> corrupt, but I would guess that a corrupt file would lead to a
> compilation error more often than not.
> 
> Thoughts?
> 
> Scott

I am not sure if this would block other instances for a long time

	Kornel
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