[Gdal-dev] C# Dataset not calling GDALClose()?

[Richard Matsunaga]

This would likely help me out a great deal, as well as anyone using GDAL
inside of an ASP.NET web site.

Cheers,
Richard

> -----Original Message-----
> From: gdal-dev-bounces at lists.maptools.org 
> 
> Frank,
> 
> OGRCleanupAll() is not exposed to SWIG right now. Should we 
> add this function to the interface?
> 
> Best regards,
> 
> Tamas
> 
> 
> 2007/7/11, Frank Warmerdam <warmerdam at pobox.com>:
> > Richard Matsunaga wrote:
> > > Thanks Tamas, I didn't look deep enough to see what was 
> happening in 
> > > the C++ code for Dataset.
> > >
> > > My problem is that our application is an ASP.NET web site and as 
> > > soon as a class instantiates a GDAL or OGR object, the 
> GDAL dll gets 
> > > locked and is only released after some long period of 
> idle time or if iisreset is called.
> > > This makes updating GDAL (or just republishing the entire 
> website) a 
> > > bit of a pain. I was initially worried that there may be a memory 
> > > leak in there as well, but that seems to not be the case.
> > >
> > > The problem is easily reproduced using NUnit as well. Any 
> test case 
> > > that uses a GDAL resource will lock the GDAL dll as well.
> > >
> > > I just tried calling Ogr.RegisterAll() and it is the cause of the 
> > > lock on the dll. There seems to be no way of releasing resources 
> > > initialized by RegisterAll(). Not surprisingly, this behaviour is 
> > > also flagged as a memory leak (albeit a small one) by 
> DevPartner when using OGR in an application.
> >
> > Richard / Tamas,
> >
> > I'm not clear on what this "DLL locking" is all about, but at the C 
> > level there is an OGRCleanupAll() function which will 
> deregister OGR 
> > drivers as well as cleanup some other memory allocations.
> >
> > Best regards,
> > --
> > 
> ---------------------------------------+------------------------------
> > ---------------------------------------+--------
> > I set the clouds in motion - turn up   | Frank Warmerdam, 
> warmerdam at pobox.com
> > light and sound - activate the windows | http://pobox.com/~warmerdam
> > and watch the world go round - Rush    | President OSGeo, 
> http://osgeo.org
> >
> >
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