[python-win32] strange crashed on calling loaded shared Library in windows

[Marcus Low]

I have this shared library that is loaded via  :

vr = ctypes.CDLL("varcfunction.dll")

When i ran it thru main :

if __name__ == "__main__" :
    str = "aaaaa"
    LR = vr.DoIt(str)
    print "results %d" %(LR)

It works perfectly fine and the return result was correct. I could loop 
it 1000 times without any problem
However when the same code is placed into a thread :

def _test_thread (count, *args) : 
    str = "aaaaa"
    LR = vr.DoIt(str)
    print "results %d" %(LR)

It bombs out on the first try with :-
WindowsError: exception: access violation reading 0x00000064

Any ideas as to what might be wrong here?