[issue14059] Implement multiprocessing.Barrier

[Richard Oudkerk]

Richard Oudkerk <shibturn at gmail.com> added the comment:

> RawValue uses ctypes, right? That's problematic for platforms which don't 
> support ctypes.

Are there many posix systems (we care about) where ctypes doesn't work?

It would be fairly easy to use memoryview instead of ctypes.  (In fact Value/RawValue could be implemented that way when using a typecode instead of a ctypes type.)

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