Why there are not any real lightweight threads for python?

I'm new to Python and seems that the multiprocessing and threads module are not very interesting 开发者_如何学Pythonand suffer from the same problems such as threads in Perl. Is there a technical reason why the interpreter can't use lightweight threads such as posix threads to make an efficient thread implementation that really runs on several cores?

It is using POSIX threads. The problem is the GIL.

Note that the GIL is not part of the Python spec --- it's part of the CPython reference implementation. Jython, for example, does not suffer from this problem.

That said, looked into Stackless ?

Piotr,

You might want to take a look at stackless (http://www.stackless.com/) which is a modified version of python running lightweight tasklets in message passing (erlang style) fashion.

I'm not sure if you're looking for a multicore solution, but poking around in stackless might give you what you're looking for.

Ben