[Gdal-dev] GDAL reentrancy issue
mbrudka at aster.pl
Mon Nov 20 13:10:52 EST 2006
Mir Hassan Ali wrote:
> I am building a small web application in C# that uses a custom
> assembly(dll) which in-turn uses the C# wrappers for gdal to read the
> .shp files (only read not write).
> My question is, since OGR/GDAL is not reentrant (this is what I assume
> after reading the post
> is it going to cause any problems to the web application as obviously
> multiple users will be using the applications at the same time.
It depends on the architecture of this web application. If the
application is launched per HTTP connection (simple CGI) then it really
doesn't matter if OGR is or is not thread safe. But if the application
is a service with pool of threads or even with thread per connection
model, then you should expect problems.
The simple patch is "one mutex to rule them all" (tm), namely before
each call to the custom assembly you mentioned above the mutex should be
locked. However, if you need more concurrent and really faster solution
you should be prepared to modify OGR..
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