Richard Oudkerk added the comment:
> These functions are compliant with POSIX standards and the return values
> are actually useful, they return the previously set masks and handlers,
> often are ignored but in complex cases it's good to know their previous
> state.
Yes. But my point was that somebody might have used such a function as the
initializer argument. The proposed change would break a program which does
with Pool(initializer=os.nice, initargs=(incr,)) as p:
...
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<http://bugs.python.org/issue19185>
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