[gdal-dev] Mutex around Proj.4
even.rouault at mines-paris.org
Sun May 9 05:19:29 EDT 2010
yes the mutex around proj.4 is necessary in order to guarantee correct
behaviour when several threads call proj.4 concurrently.
There are a few places in proj.4 where global variables are used. One of them
is the pj_errno variable / pj_strerrno() function.
There's an old discussion on the proj.4 mailing list about the issue :
other following threads the same month)
I'd note that a few things have evolved : since proj 4.7.0, there is a locking
mechanism within proj.4 that protects the init cache and the gridlist. But
the pj_errno and maybe other issues remain.
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