No, second conditional code will be called for any subtree, which
contains totally empty subtree. That check !isRoot covers case when
the entire posting tree should be erased: we cannot just quit out of
recursive cleanup, we have to make a scan here, starting from root.
Oh, I see
Probably, variable isChildHasVoid has a bit confusing name. This flag
indicates that some subtree:
1. Had empty pages
2. Did not bother deleting them, because there is a chance that it is
a part of a bigger empty subtree.
May be it'd be better to call the variable "someChildIsVoidSubtree".
hasEmptyChild? and hasNonEmptyChild (BTW, isAnyNonempy has missed 't')
And if the whole posting tree is empty,then we could mark root page as leaf and
remove all other pages in tree without any locking. Although, it could be a task
for separate patch.
--
Teodor Sigaev E-mail: teo...@sigaev.ru
WWW: http://www.sigaev.ru/
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