[issue21459] DragonFlyBSD support

[Thomas Klausner]

Thomas Klausner added the comment:

Semaphore handling needs another change.
if sem_open etc. are not provided by the operating system, do not export them (Modules/_multiprocessing/multiprocessing.c). Updated diff attached.
That part of the diff might affect more operating systems.

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Added file: http://bugs.python.org/file35433/dragonfly.diff

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