PowerBuilder Classdefinition not threadsafe?

Question

Hi,
I have an object that uses the Classdefinition variable to access the variablelist.
This functionality runs fine in single task environment (if I simple CREATE the object). But if I run it in a separate task (as SharedObject) the results are sometimes unexpected. For instance I sometimes get empty variable names or the function call or the whole application hangs.
May it be, that the access of Classdefinition is not threadsafe?
I have tested it with a simple test application (no PFC or others).

Answer 1

Additional information:
To avoid the problem I now use a mutex to serialize the access. It works almost good!
But now Powerbuilder crashes only sometimes at access of variablelist property:
Microsoft Visual C++ Runtime Library
Runtime Error!
Program: C:\Program Files (x86)\Sybase\PowerBuilder 12.0\PB120.EXE
R6025
- pure virtual function call
Any ideas what's the reason?