[Gdal-dev] multiple threads - VSIMemFileSystemHandler and nCacheUsed

[list67 at netscape.net]

Frank Warmerdam <warmerdam at pobox.com> wrote:
>The nCacheUsed variable is used to decide if blocks should
>be released from the cache to reduce memory use below
>the allowed maximum.  Because it doesn't really matter if it
>is a bit off when it is being read, I haven't protected all uses
>of this variable with the cache mutex.
>
>However, I think all updates of this variable are protected.
>Let me know if that is not the case.

Frank,

The thread checker is reporting a "read/write data race" for the nCacheUsed variable, with the two sections of code being the GDALRasterBlock destructor and the GDALRasterBlock::Internalize() member function.  It looks like the GDALRasterBlock::Internalize has a mutex lock, but the destructor does not.

    Mike

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