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Modify hash_search() API to prevent future occurrences of the error

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spotted by Qingqing Zhou.  The HASH_ENTER action now automatically
fails with elog(ERROR) on out-of-memory --- which incidentally lets
us eliminate duplicate error checks in quite a bunch of places.  If
you really need the old return-NULL-on-out-of-memory behavior, you
can ask for HASH_ENTER_NULL.  But there is now an Assert in that path
checking that you aren't hoping to get that behavior in a palloc-based
hash table.
Along the way, remove the old HASH_FIND_SAVE/HASH_REMOVE_SAVED actions,
which were not being used anywhere anymore, and were surely too ugly
and unsafe to want to see revived again.
This commit is contained in:
Tom Lane
2005-05-29 04:23:07 +00:00
parent ecd70d7526
commit e92a88272e
23 changed files with 95 additions and 218 deletions
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10
src/backend/storage/lmgr/lock.c
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@@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/storage/lmgr/lock.c,v 1.152 2005/05/19 23:30:18 tgl Exp $
* $PostgreSQL: pgsql/src/backend/storage/lmgr/lock.c,v 1.153 2005/05/29 04:23:04 tgl Exp $
*
* NOTES
* Outside modules can create a lock table and acquire/release
@@ -470,10 +470,6 @@ LockAcquire(LOCKMETHODID lockmethodid, LOCKTAG *locktag,
locallock = (LOCALLOCK *) hash_search(LockMethodLocalHash[lockmethodid],
(void *) &localtag,
HASH_ENTER, &found);
if (!locallock)
ereport(ERROR,
(errcode(ERRCODE_OUT_OF_MEMORY),
errmsg("out of memory")));
/*
* if it's a new locallock object, initialize it
@@ -531,7 +527,7 @@ LockAcquire(LOCKMETHODID lockmethodid, LOCKTAG *locktag,
*/
lock = (LOCK *) hash_search(LockMethodLockHash[lockmethodid],
(void *) locktag,
HASH_ENTER, &found);
HASH_ENTER_NULL, &found);
if (!lock)
{
LWLockRelease(masterLock);
@@ -578,7 +574,7 @@ LockAcquire(LOCKMETHODID lockmethodid, LOCKTAG *locktag,
*/
proclock = (PROCLOCK *) hash_search(LockMethodProcLockHash[lockmethodid],
(void *) &proclocktag,
HASH_ENTER, &found);
HASH_ENTER_NULL, &found);
if (!proclock)
{
/* Ooops, not enough shmem for the proclock */