[gdal-dev] RFC 101 thread-safe raster datasets and vsimem?

[Even Rouault]

Hi Sean,

>
> > But, there is currently no support for creating a thread-safe 
> dataset wrapper on on-the-fly datasets returned by some algorithms 
> (e.g GDALTranslate() or GDALWarp() with VRT as the output driver and 
> with an empty filename, or custom GDALDataset implementation by 
> external code).
>
> Are vsimem datasets a kind of on-the-fly dataset that are not 
> supported? Or can we expect vsimem datasets to be clone-able with 
> thread-safe wrappers?

The underlying file system of a dataset ( "native", /vsimem/, /vsicurl/, 
etc. ) is completely orthogonal to the thread-safety aspect.  So a 
regular GeoTIFF opened with /vsimem/  can be opened in thread-safe 
mode.     But the same dataset warped by GDALTranslate() or GDALWarp() 
can't, as stated by RFC101 . Does that make sense?

Even

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