[issue8299] Improve GIL in 2.7

[Antoine Pitrou]

Antoine Pitrou <pitrou at free.fr> added the comment:

> Yes, we put #error in both places (defining and undefining
> USE_SEMAPHORES).  The colleague in question is Christian Tismer, he is
> unlikely to have gotten it wrong.

Ok, so can you or Christian open an issue about it? We should try to fix
it.

> I am also curious why David Beazley kept talking about the "binary
> semaphore" when it is apparent that that is supposed to be a "hack" to
> use on platforms that don't have posix semaphores.

I think David often uses technical terms (such as "semaphore" or
"signal") in more generic meanings than what you might expect :)

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