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

[Pablo Sanfilippo]

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?

Hope this makes sense.

Pablo
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