[issue8299] Improve GIL in 2.7

[Martin v. Löwis]

Martin v. Löwis <martin at v.loewis.de> added the comment:

> Maybe the state of this discussion is my fault for not being clear
> enough. Let's abandon terms such as "broken" and "roundrobin."  CS
> theory has the perfectly useful terms "fair" and "unfair."  The fact
> of the matter is this: the pthread GIL (implemented as LEGACY gil) is
> an "unfair" syncronization primitve.

That's not really true. The Linux condition variable (from glibc
linuxthreads), for example, implements "fair" synchronization. Other
implementations may do the same.

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<http://bugs.python.org/issue8299>
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