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Use correct release semantic in list update.

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nscd uses lockfree lists and we need to ensure the correct release
semantics is used when adding to the list.
This commit is contained in:
Andreas Schwab 2009-07-16 09:57:32 -07:00 committed by Ulrich Drepper
parent bec466d922
commit 50158f9552
2 changed files with 7 additions and 1 deletions
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6
ChangeLog
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@ -1,4 +1,10 @@
2009-07-16 Ulrich Drepper <drepper@redhat.com> 2009-07-16 Ulrich Drepper <drepper@redhat.com>
* nscd/cache.c (cache_add): Use atomic_compare_and_exchange_bool_rel
instead of atomic_compare_and_exchange_bool_acq to ensure pointer
is written before the list head update.
Patch by Andreas Schwab <aschwab@redhat.com>.
Jakub Jelinek <jakub@redhat.com> Jakub Jelinek <jakub@redhat.com>
* malloc/malloc.c [ATOMIC_FASTBINS] (_int_free): Make check for * malloc/malloc.c [ATOMIC_FASTBINS] (_int_free): Make check for

2
nscd/cache.c
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@ -179,7 +179,7 @@ cache_add (int type, const void *key, size_t len, struct datahead *packet,
/* Put the new entry in the first position. */ /* Put the new entry in the first position. */
do do
newp->next = table->head->array[hash]; newp->next = table->head->array[hash];
while (atomic_compare_and_exchange_bool_acq (&table->head->array[hash], while (atomic_compare_and_exchange_bool_rel (&table->head->array[hash],
(ref_t) ((char *) newp (ref_t) ((char *) newp
- table->data), - table->data),
(ref_t) newp->next)); (ref_t) newp->next));