[Python-Dev] Last chance!

Guido van Rossum guido at python.org
Fri Dec 19 13:15:24 EST 2003

> > 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
> thread.


Could you dig through CVS logs to find out when f_tstate was first
introduced?  Maybe there's a clue about why there.

--Guido van Rossum (home page: http://www.python.org/~guido/)

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