[issue17914] add os.cpu_count()

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

Now we have three cpu_count() functions: multiprocessing.cpu_count() raises an exception on failure, posix.cpu_count() returns -1, and os.cpu_count() returns None. It will be easy to get rid of Python wrapper in the os module and return None directly from C code.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue17914>
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