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gc_list_move(): Make this truly equivalent to remove+append. While 

nothing in gc currently cares, the original coding could screw up if,
e.g., you tried to move a node to the list it's already in, and the node
was already the last in its list.
This commit is contained in:
Tim Peters 2004-11-01 16:39:57 +00:00
parent 099ecfbec9
commit bc1d1b80d1
1 changed files with 5 additions and 3 deletions
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8
Modules/gcmodule.c
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@ -168,14 +168,16 @@ gc_list_remove(PyGC_Head *node)
static void
gc_list_move(PyGC_Head *node, PyGC_Head *list)
{
PyGC_Head *new_prev;
PyGC_Head *current_prev = node->gc.gc_prev;
PyGC_Head *current_next = node->gc.gc_next;
PyGC_Head *new_prev = list->gc.gc_prev;
/* Unlink from current list. */
current_prev->gc.gc_next = current_next;
current_next->gc.gc_prev = current_prev;
node->gc.gc_next = list;
node->gc.gc_prev = new_prev;
/* Relink at end of new list. */
new_prev = node->gc.gc_prev = list->gc.gc_prev;
new_prev->gc.gc_next = list->gc.gc_prev = node;
node->gc.gc_next = list;
}
/* append list `from` onto list `to`; `from` becomes an empty list */