Armin Rigo <ar...@users.sourceforge.net> added the comment: Ok, I followed Nick's suggestion, and I finally found out how to write the code in order to avoid all (or most?) deadlocks without any change in the rest of CPython. It requires a way to be sure that some callback function is invoked _at the next cross-bytecode point_, and not (or not much) later, which I also include here. Here is the updated patch.
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