[Python-Dev] Last chance!

Christian Tismer tismer at tismer.com
Fri Dec 19 12:49:15 EST 2003

Guido van Rossum wrote:


> I saved the message, but haven't had the time yet to think things
> through.
> I *did* notice at least one case where using f_tstate might actually
> be a mistake: theoretically it's possible that two or more threads
> alternate calling next() on a generator (if they wrap it in a critical
> section); AFAICT the f_tstate is never updated.

Right, f_tstate is never updated.
I think there is another inconsistent
situation, which can be created easily.
If a generator is run by a different thread
than it's creator, then the frame is run in that
other thread. eval_fame correctly uses tstate,
but if tracing is activated, call_trace uses
frame->f_tstate for no obvious reason, which
will probably mess up the tracing flags of the wrong

ciao - chris
Christian Tismer             :^)   <mailto:tismer at tismer.com>
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