7100efa590
* harbour/contrib/hbodbc/odbc.c
* unlock sub-handle pointer items - it can be safely done
because these items are marked as used inside parent item
GC mark function.
; This code using pointer items is a little bit more complicated
then it has to be.
In current code pointer items can keep references only to other
pointer items in the form which cannot create cyclic reference.
They also do not have any references to codeblocks, arrays,
objects, hashes or any other complex items set by user which
may create indirectly cyclic reference. In such case it's
possible to eliminate all GC mark functions and use directly
items allocated by hb_itemNew() without unlocking them with
hb_gcUnlock(). By default all items allocated by hb_itemNew()
are locked so GC automatically mark them and their GC memory
blocks as used.
It does not cause any speed or memory overhead so I left it
as example for more complicated cases and as base for some
potential extensions.