[fdo-internals] RE: SDF feature reader

[Badreddine Karoui]

It was not obvious that the readers were on the same thread. In that case it's a defect. Make sure to copy the geometry before ReadNext is called. It's possible the second reader(ReadNext) is invalidating the geometry.

The SDF provider is thread safe but not free threaded, it's per-connection threaded.

Badreddine

From: fdo-internals-bounces at lists.osgeo.org [mailto:fdo-internals-bounces at lists.osgeo.org] On Behalf Of Haris Kurtagic
Sent: Wednesday, August 13, 2008 2:39 PM
To: FDO Internals Mail List
Subject: RE: [fdo-internals] RE: SDF feature reader

I was saying  for  two feature readers inside same thread will result in error.

Also, i would like to understand why SDF provider is not thread safe.

Haris




From: fdo-internals-bounces at lists.osgeo.org [mailto:fdo-internals-bounces at lists.osgeo.org] On Behalf Of Badreddine Karoui
Sent: Wednesday, August 13, 2008 8:18 PM
To: FDO Internals Mail List
Subject: [fdo-internals] RE: SDF feature reader

The SDF provider is per connection threaded which means only one thread can access a reader at a time. You can have many threads using their own connections/readers at the same time.

Badreddine

From: fdo-internals-bounces at lists.osgeo.org [mailto:fdo-internals-bounces at lists.osgeo.org] On Behalf Of Haris Kurtagic
Sent: Wednesday, August 13, 2008 2:29 PM
To: FDO Internals Mail List
Subject: [fdo-internals] SDF feature reader

Hi,
I have issue when when more than one feature reader is created against same SDF connection
It looks like same buffer ( created by sqlite cursor ) is shared betwean feature readers.
This will cause that data returned from feature reader with function GetGeometry will be corrupted when another reader is used.
Is this a bug or I am not looking into it correctly ?

I would like to be able to use multi thread access to sqlite database.
If I am right, SDF provider is not "thread safe" ? if so, what are main reasons for  it ?

Thank you,
Haris
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