Status of Python threading support (GIL removal)?

Terry Reedy tjreedy at
Fri Jun 19 12:15:02 EDT 2009

Jure Erznožnik wrote:
> See here for introduction:
> Digging through my problem, I discovered Python isn't exactly thread
> safe and to solve the issue, there's this Global Interpreter Lock
> (GIL) in place.
> Effectively, this causes the interpreter to utilize one core when
> threading is not used and .95 of a core when threading is utilized.

Python does not have (or not have) GIL.
It is an implementation issue.
CPython uses it, to good effect.

> Is there any work in progess on core Python modules that will
> permanently resolve this issue?
> Is there any other way to work around the issue aside from forking new
> processes or using something else?

Use one of the other implementations.
Jython, IronPython, Pypy, ???

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