[Discuss-gnuradio] question on blks/blks2/blksimpl/blksimpl2

[Achilleas Anastasopoulos]

Hi,

what is the significance of these 4 directories for
hierarchical blocks?
some of the code seems similar in the last two.
where are we supposed to contribute code: blksimpl or blksimpl2 ?

Thanks
Achilleas