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From Ricardo Rocha <rica...@apache.org>
Subject Re: REPOST: Possible multithreading bug in XSPJavaProcessor
Date Sat, 06 May 2000 18:05:44 GMT
Caramba, a repost!

This is a very important bug fix and will be applied asap
(with all due credits).

Thanks Robin!

On Sat, 06 May 2000, Robin Green wrote:
> on Fri, 28 Apr 2000 I wrote
> 
> >
> >I'm not the world's greatest expert on multithreading, but can I humbly
> >suggest that there might be a lurking bug in XSPJavaProcessor?
> >
> >As far as I can see, the only sychronization in Cocoon is
> >1) when creating the engine
> >2) the MemoryStore
> >and 3) an XSPUtil function (not relevant).
> >
> >So although there is MemoryStore synchronization, there is no
> >synchronization related to the .java and .class files which are created by
> >XSP. So you could theoretically have one thread partway through writing a
> >file, and another thread reading that file - causing a hard-to-fathom 
> >error.
> >
> >So I suggest synchronizing on compile(), and load() in XSPJavaProcessor, 
> >and
> >on whatever writes the .java file to disk (synchronizing on the same object
> >in all three cases). It introduces a bottleneck, but we can't edit the
> >compiler, so it's the best we can do.
> >
> >Or have I missed something obvious?
> >
> >
> >--
> >Robin
> >
> 
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