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[Python-Dev] Adding a threadlocal to the Python interpreter

Daniel Holth dholth at gmail.com
Thu May 26 22:41:38 EDT 2016 
Thank you. I started my patch http://bugs.python.org/issue27134 to allow
Python code to set a flag causing the evil str(b'bytes') to raise an
exception. I wasn't sure exactly which module to put it in, so it's in
_string. Please let me know the best place to put the feature and what I
should polish to get it in.

Thanks,

Daniel Holth

On Thu, May 19, 2016 at 6:34 AM Christian Heimes <christian at python.org>
wrote:

> On 2016-05-19 04:30, Nick Coghlan wrote:
> > On 18 May 2016 at 23:20, Daniel Holth <dholth at gmail.com> wrote:
> >> I would like to take another stab at adding a threadlocal "str(bytes)
> raises
> >> an exception" to the Python interpreter, but I had a very hard time
> >> understanding both how to add a threadlocal value to either the
> interpreter
> >> state or the threadlocal dict that is part of that state, and then how
> to
> >> access the same value from both Python and CPython code. The structs
> were
> >> there but it was just hard to understand. Can someone explain it to me?
> >
> > Christian covered the C aspects of the API, while the general purpose
> > Python aspects live in the threading module.
> >
> > However, the Python level thread-local API doesn't provide direct
> > access to the thread state dict. Instead, it provides access to
> > subdicts stored under per-object keys in that dict, keyed as
> > "thread.local.<id>":
>
> In case you wonder about subdicts, they are required to provide multiple
> thread local objects. Each thread local instance has its own key in each
> thread state dict. The approach enables thread local to have independent
> storage objects.
>
> Christian
>
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