[Python-Dev] Proposal to drop f_tstate

[Christian Tismer]

Guido van Rossum wrote:
>>>>Therefore, I hereby propose to remove this frame field,
>>>>in order to save space.
>>
>>...
>>
>>
>>>I notice that all the places that use f_tstate are functions that get
>>>a frame passed in.  What makes you believe that those always run in
>>>the same thread where the frame was created?
>>
>>Schluck!
>>I assumed that f_tstate was just some cache, and one would
>>never try to look into a different thread.
>>This was a wrong assumption.
> 
> 
> I don't know that it is.  I just don't know that it isn't, either.

It is in fact possible to call PyTraceBack_Here with
any frame, and this could theoretically be from
a different thread.

So I'd better not touch anything. No big deal.

>>Sorry, I will und my changes, ASAP.
> 
> 
> Where did you make any changes?

Oh, just in my Stackless trunk.
I reverted my stuff to the last version.

thanks & cheers - chris

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