[gdal-dev] Is writing/reading a VRTs an atomic operation?

[Pablo Sanfilippo]

Thanks!

On Thu, Dec 6, 2018 at 2:25 PM Even Rouault <even.rouault at spatialys.com>
wrote:

> On jeudi 6 décembre 2018 13:59:07 CET Pablo Sanfilippo wrote:
> > Hello!
> >
> > I'm building an application in which I will have multiple concurrent
> > process reading and writing to a VRT file. The writers are just multiple
> > instances of the same process that create a .vrt off a list of tiffs in a
> > folder. The writer process implement file locking, so I'm sure no two
> > processes will try to write the .vrt at the same time. But the readers
> > (which are gdal_translate calls that use the .vrt as input) don't lock
> the
> > .vrt so they can be ran at the same time. I can see a race condition
> > happening if gdalbuildvrt overwrites the file when some gdal_translate is
> > opening it. So, if I'm understanding this correctly, the question boils
> > down to: Is the read call that gdal_translate makes when reading a vrt
> file
> > atomic? And is the write call that gdalbuildvrt makes when writing the
> file
> > atomic?
>
> Much likely not. At least there's no effort in the code to make read/write
> atomic.
>
> Even
>
> --
> Spatialys - Geospatial professional services
> http://www.spatialys.com
>
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