Re: [xml] LibXml2 Crash in MultiThreaded Windows

["Lav Mehrotra" <l mehrotra zensar com>]

Daniel ,

Thanks a lot , it solved the crash !!
I was stucked for many days on it , & quite frustrated to the extent
that I have to re-write my whole portable XML Reader / Writer in Xerces
C++.

Also many thanks to Igor & Rob

I am now calling 
        xmlInitParser();
        xmlCleanupParser();

In my primary thread main() only.
( Without even these 2 the code works & there is no crash )

Xerces has  the equivalent 
        xercesc::XMLPlatformUtils::Initialize();
        xercesc::XMLPlatformUtils::Terminate();

You are allowed to call XMLPlatformUtils::Initialize() and
XMLPlatformUtils::Terminate multiple times, but each call to
XMLPlatformUtils::Initialize() must be matched with a call to
XMLPlatformUtils::Terminate.


Strangely this problem didn't show up in MultiThreaded UNIX environment
where call to xmlCleanupParser(); was within UNIX POSIX pThread's.

What I liked abt LibXml2 APIs were their simplicity 
& in contrast 
I had to achieve the counterpart of 1 LibXml2 C API in Xerces using many
C++ APIs or Classes (which of course has an OO tinge to it).

I have worked earlier on MS-XML too 
( which can be portable provided COM is universally implemented on all
UNIX variants )
but working on LibXML2 Library was really a breeze for me.

Thanks again for ur valuable inputs.

Regds,

Lav

-----Original Message-----
From: Daniel Veillard [mailto:veillard redhat com] 
Sent: Tuesday, June 10, 2008 8:02 PM
To: Lav Mehrotra
Cc: Rob Richards; xml gnome org; igor zlatkovic com
Subject: Re: [xml] LibXml2 Crash in MultiThreaded Windows

On Tue, Jun 10, 2008 at 06:35:10PM +0530, Lav Mehrotra wrote:
> NOTE : Within my thread I create Reader / Writer object on Stack so it
> goes out of scope when the thread fun exits , calls Dtor of Reader /
> Writer object , which does 
>
> xmlFreeDoc(m_ptrXMLDoc);
> xmlCleanupParser();

  If you call xmlCleanupParser from the threads on concurrent accesses
you
are garanteed to crash...
Read the docs. Looks at the many time i posted about the issue !

Daniel

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