[omniORB] leak with omniORBpy on Python 2.5

[Luke Deller]

Hello,

In omniORBpy-3.2 (and earlier versions too), the omniORB.omniThreadHook class relies on some knowledge of the internals of the python "threading" module.  Unfortunately the threading module has changed slightly in Python 2.5 in a way which breaks omniThreadHook.  In particular, the Thread.__delete method is no longer called when a thread terminates.

The consequence is that for threads created by the Python threading module (rather than by omniORB) which make CORBA calls, a C++ omni_thread instance will be leaked.  On the Windows platform, this results in a leak of a thread and a semaphore handle.  There seems to be a related memory leak, perhaps because the stack of the thread is not deallocated when the thread terminates.

Please find attached a small patch to resolve this leak.  It still relies on some knowledge of the internals of the python threading module which is not ideal.

Kind regards,
Luke.
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