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| author | Tom Lane <tgl@sss.pgh.pa.us> | 2012-03-07 14:51:13 -0500 |
|---|---|---|
| committer | Tom Lane <tgl@sss.pgh.pa.us> | 2012-03-07 14:51:13 -0500 |
| commit | d4bf3c9c94305e692349fb6fe0c67e483b72ae87 (patch) | |
| tree | f8b6fb180e026683ad7a06ab723e98eb86986c9d /src/include/utils/syscache.h | |
| parent | e685a8e6651b0e55996e6eba6917302607866793 (diff) | |
| download | postgresql-d4bf3c9c94305e692349fb6fe0c67e483b72ae87.tar.gz postgresql-d4bf3c9c94305e692349fb6fe0c67e483b72ae87.zip | |
Expose an API for calculating catcache hash values.
Now that cache invalidation callbacks get only a hash value, and not a
tuple TID (per commits 632ae6829f7abda34e15082c91d9dfb3fc0f298b and
b5282aa893e565b7844f8237462cb843438cdd5e), the only way they can restrict
what they invalidate is to know what the hash values mean. setrefs.c was
doing this via a hard-wired assumption but that seems pretty grotty, and
it'll only get worse as more cases come up. So let's expose a calculation
function that takes the same parameters as SearchSysCache. Per complaint
from Marko Kreen.
Diffstat (limited to 'src/include/utils/syscache.h')
| -rw-r--r-- | src/include/utils/syscache.h | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/src/include/utils/syscache.h b/src/include/utils/syscache.h index 0b539dba750..d59dd4e0c70 100644 --- a/src/include/utils/syscache.h +++ b/src/include/utils/syscache.h @@ -113,6 +113,9 @@ extern bool SearchSysCacheExistsAttName(Oid relid, const char *attname); extern Datum SysCacheGetAttr(int cacheId, HeapTuple tup, AttrNumber attributeNumber, bool *isNull); +extern uint32 GetSysCacheHashValue(int cacheId, + Datum key1, Datum key2, Datum key3, Datum key4); + /* list-search interface. Users of this must import catcache.h too */ extern struct catclist *SearchSysCacheList(int cacheId, int nkeys, Datum key1, Datum key2, Datum key3, Datum key4); @@ -158,6 +161,15 @@ extern struct catclist *SearchSysCacheList(int cacheId, int nkeys, #define GetSysCacheOid4(cacheId, key1, key2, key3, key4) \ GetSysCacheOid(cacheId, key1, key2, key3, key4) +#define GetSysCacheHashValue1(cacheId, key1) \ + GetSysCacheHashValue(cacheId, key1, 0, 0, 0) +#define GetSysCacheHashValue2(cacheId, key1, key2) \ + GetSysCacheHashValue(cacheId, key1, key2, 0, 0) +#define GetSysCacheHashValue3(cacheId, key1, key2, key3) \ + GetSysCacheHashValue(cacheId, key1, key2, key3, 0) +#define GetSysCacheHashValue4(cacheId, key1, key2, key3, key4) \ + GetSysCacheHashValue(cacheId, key1, key2, key3, key4) + #define SearchSysCacheList1(cacheId, key1) \ SearchSysCacheList(cacheId, 1, key1, 0, 0, 0) #define SearchSysCacheList2(cacheId, key1, key2) \ |