Dear all,
I'm wondering if cl-gd has been thoroughly tested for
thread safety? I've experienced a couple of segfaults
here and there, apparently at random, in libgd.
Cursory inspection of the code seems to suggest, for instance,
that *transfomers* is not safe; the only references to this variable
I see are in specials.lisp:
(defvar *transformers* nil
"Stack of currently active transformer objects.")
and in WITH-TRANFORMATION, which does not create a new binding
for *transformers*, but rather just pushes a new transformation
onto the global *transformers*.
Am I reading this right? It seems to me that two different
lispworks threads could run in such a way so that 1 thread
inadvertently starts running with transformers that another thread
establishes then gets swapped out.
Comments?
Alain Picard
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