Re: Are Grammar objects MT-safe ?

11 Sep 2003 22:26:50 -0000 

Great. That is really good to hear.
It is going to be a challenge to do the same in C++ would love to hellp.

Regards,
                         Jeff


From: Neil Graham <[EMAIL PROTECTED]>
Reply-To: [EMAIL PROTECTED]
To: [EMAIL PROTECTED]
Subject: Re: Are Grammar objects MT-safe ?
Date: Thu, 11 Sep 2003 18:20:59 -0400





Hi James, Jeff and all,

Yes the GrammarPool does return the Grammar object itself; but Xerces-J
grammars have been carefully architected so that they don't need to keep
state during validation.  (I have a todo to make Xerces-C grammars behave
the same way).  Clearly, since state is not a necessity in a grammar
object, there's no reason they shouldn't be designed such that state is not
necessary, thus forestalling the need to clone them that as Jeff points out
would exist otherwise.

Cheers,
Neil
Neil Graham
XML Parser Development
IBM Toronto Lab
Phone:  905-413-3519, T/L 969-3519
E-mail:  [EMAIL PROTECTED]





"Jeffrey
Rodriguez" To: [EMAIL PROTECTED]
<[EMAIL PROTECTED] cc:
ail.com> Subject: Re: Are Grammar objects MT-safe ?

                      09/11/2003 02:20
                      PM
                      Please respond to
                      xerces-j-user





Hi James,
The GrammarPool itself is thread safe, but I don't think Grammar Objects
themselves are.

I said this because the GrammarPool returns the "registered" Grammar object

( I believe),  this unique Grammar object then could be shared by multiple
threads.

If the Grammar object keeps state information multiple threads could access

the "state information"
of the object.

I think it would have been better for the GrammarPool to return a copy of
the object instead of the
object itself so each thread would have their unique Grammar object.

I would let others comment on this since I've not worked with Grammars for
a
while.

Jeffrey Rodriguez,
Silicon Valley



>From: James Williams - Sun East Coast IR Development
><[EMAIL PROTECTED]>
>Reply-To: [EMAIL PROTECTED]
>To: [EMAIL PROTECTED]
>Subject: Are Grammar objects MT-safe ?
>Date: Thu, 11 Sep 2003 11:23:15 -0400
>
>I would like to know if it is safe to share a single XMLGrammarPool
>instance among several parser instances.
>
>Obviously this won't work if the Grammar objects returned by the
>XMLGrammarPool aren't MT-safe, thus my question.
>
>Thanks,
>Jim Williams
>
>
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