[Python-Dev] Problem with signals in a single threaded application

"Martin v. Löwis" martin at v.loewis.de
Sat Jan 27 09:22:48 CET 2007

Greg Ewing schrieb:
>> Please
>> try to come up with a patch (e.g. by putting a while(is_tripped) loop
>> around the for loop).
> That isn't going to fix it. 

Why not?

> What's needed is to somehow
> atomically test and clear is_tripped at the beginning.

How would that help? The case in question was a signal raised
inside a signal handler. With my proposed solution, that would
be processed in the next while loop; if it is cleared at the
beginning, the call will wait for the next CheckSignals

Also, why does it need to clear is_tripped atomically? If
it is only cleared if it is set, I see no need to make
the test and the clearing atomic.


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