[gdal-dev] Block caching in gdal.Dataset()s opened by different threads/processes

[Rami DV]

Hello gdal-dev!

Please forgive me for the newbie question, I am just now starting to
develop more deeply with GDAL rather than just using the command line
programs.

I'm writing a program which opens a GDAL Tile Index from various different
threads & processes, and I would like to keep an LRU cache of the blocks
which are accessed, to speed up performance.

>From what I understand reading the GDALRasterBlock docs, GDAL keeps a
global raster cache of the latest blocks accessed. But what I'm not sure,
is if that cache is global within a particular thread/process, or if it's
global across all threads/processes.

So, these are the questions: does GDAL cache work across threads/processes?
Any tips on doing global caching other than rolling my own outside of GDAL?

Thanks in advance for the help & for the great software!
Rami
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