[issue10576] Add a progress callback to gcmodule

[Lukas Lueg]

Lukas Lueg <lukas.lueg at gmail.com> added the comment:

Collection may re-occur at any time, there is no promise to the callback code. However, the callback can disable the gc, preventing further collection.

I don't think we need the other callbacks to be informed. As the callbacks are worked down in the order they registered, whoever comes first is served first. Returning True from the callback is mereley a "I dont mind if gc happens now..."

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<http://bugs.python.org/issue10576>
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