[issue16500] Allow registering at-fork handlers

[Antoine Pitrou]

Antoine Pitrou added the comment:

I don't think exiting would be a good idea at all.  I'm not sure about emitting a warning: the problem is that the people seeing the warning (plain users) can't do anything about it; worse, they probably will not even understand what it is about, and will get confused.

The package maintainer should see a deprecation warning when compiling code using PyOS_AfterFork() (thanks to the Py_DEPRECATED attribute).

Of course, I'll also update the docs to add a deprecation once the design is settled.

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<http://bugs.python.org/issue16500>
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