[Python-Dev] Feature Request: Py_NewInterpreter to create separate GIL (branch) (original) (raw)

Guido van Rossum guido at python.org
Mon Nov 6 05:52:46 CET 2006

On 11/5/06, James Y Knight <foom at fuhm.net> wrote:

On Nov 4, 2006, at 3:49 AM, Martin v. Löwis wrote: > Notice that at least the following objects are shared between > interpreters, as they are singletons: > - None, True, False, (), "", u"" > - strings of length 1, Unicode strings of length 1 with ord < 256_ _> - integers between -5 and 256 > How do you deal with the reference counters of these objects? > > Also, type objects (in particular exception types) are shared between > interpreters. These are mutable objects, so you have actually > dictionaries shared between interpreters. How would you deal with > these? All these should be dealt with by making them per-interpreter singletons, not per address space. That should be simple enough, unfortunately the margins of this email are too small to describe how. ;) Also it'd be backwards incompatible with current extension modules.

I don't know how you define simple. In order to be able to have separate GILs you have to remove all sharing of objects between interpreters. And all other data structures, too. It would probably kill performance too, because currently obmalloc relies on the GIL.

So I don't see much point in continuing this thread.

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

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