472,353 Members | 1,901 Online
Bytes | Software Development & Data Engineering Community
+ Post

Home Posts Topics Members FAQ

Join Bytes to post your question to a community of 472,353 software developers and data experts.

Does anybody really use frame->f_tstate ?

Hi colleagues,

this is my second attempt to get rid of the f_tstate field
in frames. I need to find every user of this field.

What am I talking about?
Well, Python always has a thread state variable which
is a unique handle to the current thread. This variable
is accessed in many places, and there exists a fast macro
to get at it.
Every executing Python frame also gets a copy on creation.
In some cases, this frame->f_tstate field is used,
in other cases the current tstate variable is used.

If this sounds foreign to you, please stop reading here.


I would like to get rid of the frame->f_tstate, and I'm trying
to find out if there is a need for it. I don't need it,
for Stackless, it is the opposite, it disturbs.

There was a small thread about this in June this year, where
Guido convinced me that it is possible to create a traceback
on a frame that comes from a different thread.


Ok, this is in fact possible, although I don't think
anybody has a need for this.

My question to all extension writers is this:
If you use frame->f_tstate at all, do you use it just
because it is handy, or do you want to use it for
some other purpose?

One purpose could be that you really want to create a traceback
on a different than the current thread. I have never seen this,
but who knows, so that's why I'm asking the Python world.

In most cases, a traceback will be created on a frame
that is currently processd or just has been processed.
Accessing a frame of a different thread that is being processed
might make sense for special debugger cases.

My proposal is

a) change semantics of PytraceBack_Here to use the current tstate.

b) if such a special purpose exists, create a new function for it.

c) if urgent, different needs exist to keep f_tstate,
then let's forget about this proposal.

Especially for Stackless, I'd be keen of getting rid of this.

thanks for input -- chris
Christian Tismer :^) <mailto:ti****@tismer.com>
Mission Impossible 5oftware : Have a break! Take a ride on Python's
Johannes-Niemeyer-Weg 9a : *Starship* http://starship.python.net/
14109 Berlin : PGP key -> http://wwwkeys.pgp.net/
work +49 30 89 09 53 34 home +49 30 802 86 56 mobile +49 173 24 18 776
PGP 0x57F3BF04 9064 F4E1 D754 C2FF 1619 305B C09C 5A3B 57F3 BF04
whom do you want to sponsor today? http://www.stackless.com/

Jul 18 '05 #1
0 1067

This thread has been closed and replies have been disabled. Please start a new discussion.

Similar topics

by: Christian Tismer | last post by:
Hi friends, for the last two+ weeks, I was hacking on the internals of stackless, in order to make things cleaner, smaller, more natural and...
by: Kemmylinns12 | last post by:
Blockchain technology has emerged as a transformative force in the business world, offering unprecedented opportunities for innovation and...
by: Naresh1 | last post by:
What is WebLogic Admin Training? WebLogic Admin Training is a specialized program designed to equip individuals with the skills and knowledge...
by: jalbright99669 | last post by:
Am having a bit of a time with URL Rewrite. I need to incorporate http to https redirect with a reverse proxy. I have the URL Rewrite rules made...
by: antdb | last post by:
Ⅰ. Advantage of AntDB: hyper-convergence + streaming processing engine In the overall architecture, a new "hyper-convergence" concept was...
by: Matthew3360 | last post by:
Hi, I have a python app that i want to be able to get variables from a php page on my webserver. My python app is on my computer. How would I make it...
by: AndyPSV | last post by:
HOW CAN I CREATE AN AI with an .executable file that would suck all files in the folder and on my computerHOW CAN I CREATE AN AI with an .executable...
by: WisdomUfot | last post by:
It's an interesting question you've got about how Gmail hides the HTTP referrer when a link in an email is clicked. While I don't have the specific...
by: BLUEPANDA | last post by:
At BluePanda Dev, we're passionate about building high-quality software and sharing our knowledge with the community. That's why we've created a SaaS...
by: Rahul1995seven | last post by:
Introduction: In the realm of programming languages, Python has emerged as a powerhouse. With its simplicity, versatility, and robustness, Python...

By using Bytes.com and it's services, you agree to our Privacy Policy and Terms of Use.

To disable or enable advertisements and analytics tracking please visit the manage ads & tracking page.