PyFinalize problem from multiple DLLs - a possible work-around

Paul Miller paul at fxtech.com
Sun Oct 20 16:55:59 CEST 2002


Hi folks. We're embedding Python and have come across a conflict when
multiple DLLs that link to Python are used. Here is the scenario:

	Application
		Extension1.dll
			python22.dll
		Extension2.dll
			python22.dll

Although neither Extension knows about the other, they both link to
python, which seems to be sharing its global state between the two. This
causes problems when we do this:

	Application Startup
		Extension1_Startup
			PyInitialize
		Extension2_Startup
			PyInitialize

		Extension1_Shutdown
			PyFinalize
		Extension2_Shutdown
			PyFinalize	<--- oops

The first call to PyFinalize is cleaning everthing up, so the second
PyFinalize (or, Py_EndInterpreter) causes a critical exit error.

I think I have worked around the problem, however, by turning the static
initialized variable in pythonrun.c into a counter. PyInitialize
increments the counter, and initializes when it is 1. PyFinalize
decrements the counter, and cleans up when it reaches 0. 

Can someone:

1. confirm this problem really exists
2. agree my solution probably fixes it (I have the code to proove it)
3. tell me where to submit the patch?

Thanks a lot!



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