I wrote:
> Py_AddPendingCall is safe to call from a signal handler?  That would
> be ... quite remarkable.

I think that a much safer way to proceed would be, rather than asking
"how can I mess with the signal handlers", asking "how can I make my
python code act like it is sprinkled with CHECK_FOR_INTERRUPTS calls".

After some perusing of the Python docs I think it might be possible to
do this by setting up a trace function (cf Py_tracefunc()) that returns
a Python error condition if InterruptPending && (QueryCancelPending ||
ProcDiePending) is true.

                        regards, tom lane

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