Unregister signal handlers during engine shutdown #1953
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This PR is relevant for hosting scenarios. Importing module
signalin one IronPython engine registers a Ctrl+C signal handler, but it was not properly unregistered on engine shutdown. This means the handler was being referenced from the staticSystem.Console(on Windows I suppose from the callback marshalling code) and caused a memory leak and interference with another later instance of the engine (at best).The solution in this PR is to make
PythonSignalStatedisposable and modifyPythonContextthat it recognizes disposable module states. For good measure I implemented a finalizer too although I think it will never (i.e before process termination) be called because without a call toDispose()reference will stay alive and not being GC-ed.