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Improve test coverage of CLOBBER_CACHE_ALWAYS by having it also force

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reloading of operator class information on each use of LookupOpclassInfo.
Had this been in place a year ago, it would have helped me find a bug
in the then-new 'operator family' code.  Now that we have a build farm
member testing CLOBBER_CACHE_ALWAYS on a regular basis, it seems worth
expending a little bit of effort here.
This commit is contained in:
Tom Lane 2007-11-28 20:44:26 +00:00
parent 62312ce36d
commit 03ffc4d6d5
1 changed files with 44 additions and 24 deletions
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68
src/backend/utils/cache/relcache.c vendored
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@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/utils/cache/relcache.c,v 1.264 2007/11/15 21:14:40 momjian Exp $
* $PostgreSQL: pgsql/src/backend/utils/cache/relcache.c,v 1.265 2007/11/28 20:44:26 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -1133,9 +1133,13 @@ IndexSupportInitialize(oidvector *indclass,
* numbers is passed in, rather than being looked up, mainly because the
* caller will have it already.
*
* XXX There isn't any provision for flushing the cache. However, there
* isn't any provision for flushing relcache entries when opclass info
* changes, either :-(
* Note there is no provision for flushing the cache. This is OK at the
* moment because there is no way to ALTER any interesting properties of an
* existing opclass --- all you can do is drop it, which will result in
* a useless but harmless dead entry in the cache. To support altering
* opclass membership (not the same as opfamily membership!), we'd need to
* be able to flush this cache as well as the contents of relcache entries
* for indexes.
*/
static OpClassCacheEnt *
LookupOpclassInfo(Oid operatorClassOid,
@ -1170,34 +1174,50 @@ LookupOpclassInfo(Oid operatorClassOid,
(void *) &operatorClassOid,
HASH_ENTER, &found);
if (found && opcentry->valid)
if (!found)
{
/* Need to allocate memory for new entry */
opcentry->valid = false; /* until known OK */
opcentry->numStrats = numStrats;
opcentry->numSupport = numSupport;
if (numStrats > 0)
opcentry->operatorOids = (Oid *)
MemoryContextAllocZero(CacheMemoryContext,
numStrats * sizeof(Oid));
else
opcentry->operatorOids = NULL;
if (numSupport > 0)
opcentry->supportProcs = (RegProcedure *)
MemoryContextAllocZero(CacheMemoryContext,
numSupport * sizeof(RegProcedure));
else
opcentry->supportProcs = NULL;
}
else
{
/* Already made an entry for it */
Assert(numStrats == opcentry->numStrats);
Assert(numSupport == opcentry->numSupport);
return opcentry;
}
/* Need to fill in new entry */
opcentry->valid = false; /* until known OK */
opcentry->numStrats = numStrats;
opcentry->numSupport = numSupport;
/*
* When testing for cache-flush hazards, we intentionally disable the
* operator class cache and force reloading of the info on each call.
* This is helpful because we want to test the case where a cache flush
* occurs while we are loading the info, and it's very hard to provoke
* that if this happens only once per opclass per backend.
*/
#if defined(CLOBBER_CACHE_ALWAYS)
opcentry->valid = false;
#endif
if (numStrats > 0)
opcentry->operatorOids = (Oid *)
MemoryContextAllocZero(CacheMemoryContext,
numStrats * sizeof(Oid));
else
opcentry->operatorOids = NULL;
if (numSupport > 0)
opcentry->supportProcs = (RegProcedure *)
MemoryContextAllocZero(CacheMemoryContext,
numSupport * sizeof(RegProcedure));
else
opcentry->supportProcs = NULL;
if (opcentry->valid)
return opcentry;
/*
* Need to fill in new entry.
*
* To avoid infinite recursion during startup, force heap scans if we're
* looking up info for the opclasses used by the indexes we would like to
* reference here.