Line data Source code
1 : /*-------------------------------------------------------------------------
2 : *
3 : * catcache.c
4 : * System catalog cache for tuples matching a key.
5 : *
6 : * Portions Copyright (c) 1996-2026, PostgreSQL Global Development Group
7 : * Portions Copyright (c) 1994, Regents of the University of California
8 : *
9 : *
10 : * IDENTIFICATION
11 : * src/backend/utils/cache/catcache.c
12 : *
13 : *-------------------------------------------------------------------------
14 : */
15 : #include "postgres.h"
16 :
17 : #include "access/genam.h"
18 : #include "access/heaptoast.h"
19 : #include "access/relscan.h"
20 : #include "access/table.h"
21 : #include "access/xact.h"
22 : #include "catalog/catalog.h"
23 : #include "catalog/pg_collation.h"
24 : #include "catalog/pg_type.h"
25 : #include "common/hashfn.h"
26 : #include "common/pg_prng.h"
27 : #include "miscadmin.h"
28 : #include "port/pg_bitutils.h"
29 : #ifdef CATCACHE_STATS
30 : #include "storage/ipc.h" /* for on_proc_exit */
31 : #endif
32 : #include "storage/lmgr.h"
33 : #include "utils/builtins.h"
34 : #include "utils/catcache.h"
35 : #include "utils/datum.h"
36 : #include "utils/fmgroids.h"
37 : #include "utils/injection_point.h"
38 : #include "utils/inval.h"
39 : #include "utils/memutils.h"
40 : #include "utils/rel.h"
41 : #include "utils/resowner.h"
42 : #include "utils/syscache.h"
43 :
44 : /*
45 : * If a catcache invalidation is processed while we are in the middle of
46 : * creating a catcache entry (or list), it might apply to the entry we're
47 : * creating, making it invalid before it's been inserted to the catcache. To
48 : * catch such cases, we have a stack of "create-in-progress" entries. Cache
49 : * invalidation marks any matching entries in the stack as dead, in addition
50 : * to the actual CatCTup and CatCList entries.
51 : */
52 : typedef struct CatCInProgress
53 : {
54 : CatCache *cache; /* cache that the entry belongs to */
55 : uint32 hash_value; /* hash of the entry; ignored for lists */
56 : bool list; /* is it a list entry? */
57 : bool dead; /* set when the entry is invalidated */
58 : struct CatCInProgress *next;
59 : } CatCInProgress;
60 :
61 : static CatCInProgress *catcache_in_progress_stack = NULL;
62 :
63 : /* #define CACHEDEBUG */ /* turns DEBUG elogs on */
64 :
65 : /*
66 : * Given a hash value and the size of the hash table, find the bucket
67 : * in which the hash value belongs. Since the hash table must contain
68 : * a power-of-2 number of elements, this is a simple bitmask.
69 : */
70 : #define HASH_INDEX(h, sz) ((Index) ((h) & ((sz) - 1)))
71 :
72 :
73 : /*
74 : * variables, macros and other stuff
75 : */
76 :
77 : #ifdef CACHEDEBUG
78 : #define CACHE_elog(...) elog(__VA_ARGS__)
79 : #else
80 : #define CACHE_elog(...)
81 : #endif
82 :
83 : /* Cache management header --- pointer is NULL until created */
84 : static CatCacheHeader *CacheHdr = NULL;
85 :
86 : static inline HeapTuple SearchCatCacheInternal(CatCache *cache,
87 : int nkeys,
88 : Datum v1, Datum v2,
89 : Datum v3, Datum v4);
90 :
91 : static pg_noinline HeapTuple SearchCatCacheMiss(CatCache *cache,
92 : int nkeys,
93 : uint32 hashValue,
94 : Index hashIndex,
95 : Datum v1, Datum v2,
96 : Datum v3, Datum v4);
97 :
98 : static uint32 CatalogCacheComputeHashValue(CatCache *cache, int nkeys,
99 : Datum v1, Datum v2, Datum v3, Datum v4);
100 : static uint32 CatalogCacheComputeTupleHashValue(CatCache *cache, int nkeys,
101 : HeapTuple tuple);
102 : static inline bool CatalogCacheCompareTuple(const CatCache *cache, int nkeys,
103 : const Datum *cachekeys,
104 : const Datum *searchkeys);
105 :
106 : #ifdef CATCACHE_STATS
107 : static void CatCachePrintStats(int code, Datum arg);
108 : #endif
109 : static void CatCacheRemoveCTup(CatCache *cache, CatCTup *ct);
110 : static void CatCacheRemoveCList(CatCache *cache, CatCList *cl);
111 : static void RehashCatCache(CatCache *cp);
112 : static void RehashCatCacheLists(CatCache *cp);
113 : static void CatalogCacheInitializeCache(CatCache *cache);
114 : static CatCTup *CatalogCacheCreateEntry(CatCache *cache, HeapTuple ntp,
115 : Datum *arguments,
116 : uint32 hashValue, Index hashIndex);
117 :
118 : static void ReleaseCatCacheWithOwner(HeapTuple tuple, ResourceOwner resowner);
119 : static void ReleaseCatCacheListWithOwner(CatCList *list, ResourceOwner resowner);
120 : static void CatCacheFreeKeys(TupleDesc tupdesc, int nkeys, const int *attnos,
121 : const Datum *keys);
122 : static void CatCacheCopyKeys(TupleDesc tupdesc, int nkeys, const int *attnos,
123 : const Datum *srckeys, Datum *dstkeys);
124 :
125 :
126 : /*
127 : * internal support functions
128 : */
129 :
130 : /* ResourceOwner callbacks to hold catcache references */
131 :
132 : static void ResOwnerReleaseCatCache(Datum res);
133 : static char *ResOwnerPrintCatCache(Datum res);
134 : static void ResOwnerReleaseCatCacheList(Datum res);
135 : static char *ResOwnerPrintCatCacheList(Datum res);
136 :
137 : static const ResourceOwnerDesc catcache_resowner_desc =
138 : {
139 : /* catcache references */
140 : .name = "catcache reference",
141 : .release_phase = RESOURCE_RELEASE_AFTER_LOCKS,
142 : .release_priority = RELEASE_PRIO_CATCACHE_REFS,
143 : .ReleaseResource = ResOwnerReleaseCatCache,
144 : .DebugPrint = ResOwnerPrintCatCache
145 : };
146 :
147 : static const ResourceOwnerDesc catlistref_resowner_desc =
148 : {
149 : /* catcache-list pins */
150 : .name = "catcache list reference",
151 : .release_phase = RESOURCE_RELEASE_AFTER_LOCKS,
152 : .release_priority = RELEASE_PRIO_CATCACHE_LIST_REFS,
153 : .ReleaseResource = ResOwnerReleaseCatCacheList,
154 : .DebugPrint = ResOwnerPrintCatCacheList
155 : };
156 :
157 : /* Convenience wrappers over ResourceOwnerRemember/Forget */
158 : static inline void
159 47235185 : ResourceOwnerRememberCatCacheRef(ResourceOwner owner, HeapTuple tuple)
160 : {
161 47235185 : ResourceOwnerRemember(owner, PointerGetDatum(tuple), &catcache_resowner_desc);
162 47235185 : }
163 : static inline void
164 47229430 : ResourceOwnerForgetCatCacheRef(ResourceOwner owner, HeapTuple tuple)
165 : {
166 47229430 : ResourceOwnerForget(owner, PointerGetDatum(tuple), &catcache_resowner_desc);
167 47229430 : }
168 : static inline void
169 2030289 : ResourceOwnerRememberCatCacheListRef(ResourceOwner owner, CatCList *list)
170 : {
171 2030289 : ResourceOwnerRemember(owner, PointerGetDatum(list), &catlistref_resowner_desc);
172 2030289 : }
173 : static inline void
174 2030271 : ResourceOwnerForgetCatCacheListRef(ResourceOwner owner, CatCList *list)
175 : {
176 2030271 : ResourceOwnerForget(owner, PointerGetDatum(list), &catlistref_resowner_desc);
177 2030271 : }
178 :
179 :
180 : /*
181 : * Hash and equality functions for system types that are used as cache key
182 : * fields. In some cases, we just call the regular SQL-callable functions for
183 : * the appropriate data type, but that tends to be a little slow, and the
184 : * speed of these functions is performance-critical. Therefore, for data
185 : * types that frequently occur as catcache keys, we hard-code the logic here.
186 : * Avoiding the overhead of DirectFunctionCallN(...) is a substantial win, and
187 : * in certain cases (like int4) we can adopt a faster hash algorithm as well.
188 : */
189 :
190 : static bool
191 3073919 : chareqfast(Datum a, Datum b)
192 : {
193 3073919 : return DatumGetChar(a) == DatumGetChar(b);
194 : }
195 :
196 : static uint32
197 3497840 : charhashfast(Datum datum)
198 : {
199 3497840 : return murmurhash32((int32) DatumGetChar(datum));
200 : }
201 :
202 : static bool
203 2023763 : nameeqfast(Datum a, Datum b)
204 : {
205 2023763 : char *ca = NameStr(*DatumGetName(a));
206 2023763 : char *cb = NameStr(*DatumGetName(b));
207 :
208 2023763 : return strncmp(ca, cb, NAMEDATALEN) == 0;
209 : }
210 :
211 : static uint32
212 4695502 : namehashfast(Datum datum)
213 : {
214 4695502 : char *key = NameStr(*DatumGetName(datum));
215 :
216 4695502 : return hash_bytes((unsigned char *) key, strlen(key));
217 : }
218 :
219 : static bool
220 4927836 : int2eqfast(Datum a, Datum b)
221 : {
222 4927836 : return DatumGetInt16(a) == DatumGetInt16(b);
223 : }
224 :
225 : static uint32
226 6824157 : int2hashfast(Datum datum)
227 : {
228 6824157 : return murmurhash32((int32) DatumGetInt16(datum));
229 : }
230 :
231 : static bool
232 54907305 : int4eqfast(Datum a, Datum b)
233 : {
234 54907305 : return DatumGetInt32(a) == DatumGetInt32(b);
235 : }
236 :
237 : static uint32
238 64311535 : int4hashfast(Datum datum)
239 : {
240 64311535 : return murmurhash32((int32) DatumGetInt32(datum));
241 : }
242 :
243 : static bool
244 89 : texteqfast(Datum a, Datum b)
245 : {
246 : /*
247 : * The use of DEFAULT_COLLATION_OID is fairly arbitrary here. We just
248 : * want to take the fast "deterministic" path in texteq().
249 : */
250 89 : return DatumGetBool(DirectFunctionCall2Coll(texteq, DEFAULT_COLLATION_OID, a, b));
251 : }
252 :
253 : static uint32
254 1966 : texthashfast(Datum datum)
255 : {
256 : /* analogously here as in texteqfast() */
257 1966 : return DatumGetInt32(DirectFunctionCall1Coll(hashtext, DEFAULT_COLLATION_OID, datum));
258 : }
259 :
260 : static bool
261 1575 : oidvectoreqfast(Datum a, Datum b)
262 : {
263 1575 : return DatumGetBool(DirectFunctionCall2(oidvectoreq, a, b));
264 : }
265 :
266 : static uint32
267 212429 : oidvectorhashfast(Datum datum)
268 : {
269 212429 : return DatumGetInt32(DirectFunctionCall1(hashoidvector, datum));
270 : }
271 :
272 : /* Lookup support functions for a type. */
273 : static void
274 652558 : GetCCHashEqFuncs(Oid keytype, CCHashFN *hashfunc, RegProcedure *eqfunc, CCFastEqualFN *fasteqfunc)
275 : {
276 652558 : switch (keytype)
277 : {
278 8484 : case BOOLOID:
279 8484 : *hashfunc = charhashfast;
280 8484 : *fasteqfunc = chareqfast;
281 8484 : *eqfunc = F_BOOLEQ;
282 8484 : break;
283 11081 : case CHAROID:
284 11081 : *hashfunc = charhashfast;
285 11081 : *fasteqfunc = chareqfast;
286 11081 : *eqfunc = F_CHAREQ;
287 11081 : break;
288 122077 : case NAMEOID:
289 122077 : *hashfunc = namehashfast;
290 122077 : *fasteqfunc = nameeqfast;
291 122077 : *eqfunc = F_NAMEEQ;
292 122077 : break;
293 37329 : case INT2OID:
294 37329 : *hashfunc = int2hashfast;
295 37329 : *fasteqfunc = int2eqfast;
296 37329 : *eqfunc = F_INT2EQ;
297 37329 : break;
298 10140 : case INT4OID:
299 10140 : *hashfunc = int4hashfast;
300 10140 : *fasteqfunc = int4eqfast;
301 10140 : *eqfunc = F_INT4EQ;
302 10140 : break;
303 4524 : case TEXTOID:
304 4524 : *hashfunc = texthashfast;
305 4524 : *fasteqfunc = texteqfast;
306 4524 : *eqfunc = F_TEXTEQ;
307 4524 : break;
308 449950 : case OIDOID:
309 : case REGPROCOID:
310 : case REGPROCEDUREOID:
311 : case REGOPEROID:
312 : case REGOPERATOROID:
313 : case REGCLASSOID:
314 : case REGTYPEOID:
315 : case REGCOLLATIONOID:
316 : case REGCONFIGOID:
317 : case REGDICTIONARYOID:
318 : case REGROLEOID:
319 : case REGNAMESPACEOID:
320 : case REGDATABASEOID:
321 449950 : *hashfunc = int4hashfast;
322 449950 : *fasteqfunc = int4eqfast;
323 449950 : *eqfunc = F_OIDEQ;
324 449950 : break;
325 8973 : case OIDVECTOROID:
326 8973 : *hashfunc = oidvectorhashfast;
327 8973 : *fasteqfunc = oidvectoreqfast;
328 8973 : *eqfunc = F_OIDVECTOREQ;
329 8973 : break;
330 0 : default:
331 0 : elog(FATAL, "type %u not supported as catcache key", keytype);
332 : *hashfunc = NULL; /* keep compiler quiet */
333 :
334 : *eqfunc = InvalidOid;
335 : break;
336 : }
337 652558 : }
338 :
339 : /*
340 : * CatalogCacheComputeHashValue
341 : *
342 : * Compute the hash value associated with a given set of lookup keys
343 : */
344 : static uint32
345 56882091 : CatalogCacheComputeHashValue(CatCache *cache, int nkeys,
346 : Datum v1, Datum v2, Datum v3, Datum v4)
347 : {
348 56882091 : uint32 hashValue = 0;
349 : uint32 oneHash;
350 56882091 : CCHashFN *cc_hashfunc = cache->cc_hashfunc;
351 :
352 : CACHE_elog(DEBUG2, "CatalogCacheComputeHashValue %s %d %p",
353 : cache->cc_relname, nkeys, cache);
354 :
355 56882091 : switch (nkeys)
356 : {
357 2601777 : case 4:
358 2601777 : oneHash = (cc_hashfunc[3]) (v4);
359 2601777 : hashValue ^= pg_rotate_left32(oneHash, 24);
360 : /* FALLTHROUGH */
361 6552639 : case 3:
362 6552639 : oneHash = (cc_hashfunc[2]) (v3);
363 6552639 : hashValue ^= pg_rotate_left32(oneHash, 16);
364 : /* FALLTHROUGH */
365 13506922 : case 2:
366 13506922 : oneHash = (cc_hashfunc[1]) (v2);
367 13506922 : hashValue ^= pg_rotate_left32(oneHash, 8);
368 : /* FALLTHROUGH */
369 56882091 : case 1:
370 56882091 : oneHash = (cc_hashfunc[0]) (v1);
371 56882091 : hashValue ^= oneHash;
372 56882091 : break;
373 0 : default:
374 0 : elog(FATAL, "wrong number of hash keys: %d", nkeys);
375 : break;
376 : }
377 :
378 56882091 : return hashValue;
379 : }
380 :
381 : /*
382 : * CatalogCacheComputeTupleHashValue
383 : *
384 : * Compute the hash value associated with a given tuple to be cached
385 : */
386 : static uint32
387 3850716 : CatalogCacheComputeTupleHashValue(CatCache *cache, int nkeys, HeapTuple tuple)
388 : {
389 3850716 : Datum v1 = 0,
390 3850716 : v2 = 0,
391 3850716 : v3 = 0,
392 3850716 : v4 = 0;
393 3850716 : bool isNull = false;
394 3850716 : int *cc_keyno = cache->cc_keyno;
395 3850716 : TupleDesc cc_tupdesc = cache->cc_tupdesc;
396 :
397 : /* Now extract key fields from tuple, insert into scankey */
398 3850716 : switch (nkeys)
399 : {
400 244095 : case 4:
401 244095 : v4 = fastgetattr(tuple,
402 244095 : cc_keyno[3],
403 : cc_tupdesc,
404 : &isNull);
405 : Assert(!isNull);
406 : /* FALLTHROUGH */
407 699392 : case 3:
408 699392 : v3 = fastgetattr(tuple,
409 699392 : cc_keyno[2],
410 : cc_tupdesc,
411 : &isNull);
412 : Assert(!isNull);
413 : /* FALLTHROUGH */
414 2801020 : case 2:
415 2801020 : v2 = fastgetattr(tuple,
416 2801020 : cc_keyno[1],
417 : cc_tupdesc,
418 : &isNull);
419 : Assert(!isNull);
420 : /* FALLTHROUGH */
421 3850716 : case 1:
422 3850716 : v1 = fastgetattr(tuple,
423 : cc_keyno[0],
424 : cc_tupdesc,
425 : &isNull);
426 : Assert(!isNull);
427 3850716 : break;
428 0 : default:
429 0 : elog(FATAL, "wrong number of hash keys: %d", nkeys);
430 : break;
431 : }
432 :
433 3850716 : return CatalogCacheComputeHashValue(cache, nkeys, v1, v2, v3, v4);
434 : }
435 :
436 : /*
437 : * CatalogCacheCompareTuple
438 : *
439 : * Compare a tuple to the passed arguments.
440 : */
441 : static inline bool
442 48834283 : CatalogCacheCompareTuple(const CatCache *cache, int nkeys,
443 : const Datum *cachekeys,
444 : const Datum *searchkeys)
445 : {
446 48834283 : const CCFastEqualFN *cc_fastequal = cache->cc_fastequal;
447 : int i;
448 :
449 113768770 : for (i = 0; i < nkeys; i++)
450 : {
451 64934487 : if (!(cc_fastequal[i]) (cachekeys[i], searchkeys[i]))
452 0 : return false;
453 : }
454 48834283 : return true;
455 : }
456 :
457 :
458 : #ifdef CATCACHE_STATS
459 :
460 : static void
461 : CatCachePrintStats(int code, Datum arg)
462 : {
463 : slist_iter iter;
464 : uint64 cc_searches = 0;
465 : uint64 cc_hits = 0;
466 : uint64 cc_neg_hits = 0;
467 : uint64 cc_newloads = 0;
468 : uint64 cc_invals = 0;
469 : uint64 cc_nlists = 0;
470 : uint64 cc_lsearches = 0;
471 : uint64 cc_lhits = 0;
472 :
473 : slist_foreach(iter, &CacheHdr->ch_caches)
474 : {
475 : CatCache *cache = slist_container(CatCache, cc_next, iter.cur);
476 :
477 : if (cache->cc_ntup == 0 && cache->cc_searches == 0)
478 : continue; /* don't print unused caches */
479 : elog(DEBUG2, "catcache %s/%u: %d tup, %" PRIu64 " srch, %" PRIu64 "+%"
480 : PRIu64 "=%" PRIu64 " hits, %" PRIu64 "+%" PRIu64 "=%"
481 : PRIu64 " loads, %" PRIu64 " invals, %d lists, %" PRIu64
482 : " lsrch, %" PRIu64 " lhits",
483 : cache->cc_relname,
484 : cache->cc_indexoid,
485 : cache->cc_ntup,
486 : cache->cc_searches,
487 : cache->cc_hits,
488 : cache->cc_neg_hits,
489 : cache->cc_hits + cache->cc_neg_hits,
490 : cache->cc_newloads,
491 : cache->cc_searches - cache->cc_hits - cache->cc_neg_hits - cache->cc_newloads,
492 : cache->cc_searches - cache->cc_hits - cache->cc_neg_hits,
493 : cache->cc_invals,
494 : cache->cc_nlist,
495 : cache->cc_lsearches,
496 : cache->cc_lhits);
497 : cc_searches += cache->cc_searches;
498 : cc_hits += cache->cc_hits;
499 : cc_neg_hits += cache->cc_neg_hits;
500 : cc_newloads += cache->cc_newloads;
501 : cc_invals += cache->cc_invals;
502 : cc_nlists += cache->cc_nlist;
503 : cc_lsearches += cache->cc_lsearches;
504 : cc_lhits += cache->cc_lhits;
505 : }
506 : elog(DEBUG2, "catcache totals: %d tup, %" PRIu64 " srch, %" PRIu64 "+%"
507 : PRIu64 "=%" PRIu64 " hits, %" PRIu64 "+%" PRIu64 "=%" PRIu64
508 : " loads, %" PRIu64 " invals, %" PRIu64 " lists, %" PRIu64
509 : " lsrch, %" PRIu64 " lhits",
510 : CacheHdr->ch_ntup,
511 : cc_searches,
512 : cc_hits,
513 : cc_neg_hits,
514 : cc_hits + cc_neg_hits,
515 : cc_newloads,
516 : cc_searches - cc_hits - cc_neg_hits - cc_newloads,
517 : cc_searches - cc_hits - cc_neg_hits,
518 : cc_invals,
519 : cc_nlists,
520 : cc_lsearches,
521 : cc_lhits);
522 : }
523 : #endif /* CATCACHE_STATS */
524 :
525 :
526 : /*
527 : * CatCacheRemoveCTup
528 : *
529 : * Unlink and delete the given cache entry
530 : *
531 : * NB: if it is a member of a CatCList, the CatCList is deleted too.
532 : * Both the cache entry and the list had better have zero refcount.
533 : */
534 : static void
535 845462 : CatCacheRemoveCTup(CatCache *cache, CatCTup *ct)
536 : {
537 : Assert(ct->refcount == 0);
538 : Assert(ct->my_cache == cache);
539 :
540 845462 : if (ct->c_list)
541 : {
542 : /*
543 : * The cleanest way to handle this is to call CatCacheRemoveCList,
544 : * which will recurse back to me, and the recursive call will do the
545 : * work. Set the "dead" flag to make sure it does recurse.
546 : */
547 0 : ct->dead = true;
548 0 : CatCacheRemoveCList(cache, ct->c_list);
549 0 : return; /* nothing left to do */
550 : }
551 :
552 : /* delink from linked list */
553 845462 : dlist_delete(&ct->cache_elem);
554 :
555 : /*
556 : * Free keys when we're dealing with a negative entry, normal entries just
557 : * point into tuple, allocated together with the CatCTup.
558 : */
559 845462 : if (ct->negative)
560 244409 : CatCacheFreeKeys(cache->cc_tupdesc, cache->cc_nkeys,
561 244409 : cache->cc_keyno, ct->keys);
562 :
563 845462 : pfree(ct);
564 :
565 845462 : --cache->cc_ntup;
566 845462 : --CacheHdr->ch_ntup;
567 : }
568 :
569 : /*
570 : * CatCacheRemoveCList
571 : *
572 : * Unlink and delete the given cache list entry
573 : *
574 : * NB: any dead member entries that become unreferenced are deleted too.
575 : */
576 : static void
577 69970 : CatCacheRemoveCList(CatCache *cache, CatCList *cl)
578 : {
579 : int i;
580 :
581 : Assert(cl->refcount == 0);
582 : Assert(cl->my_cache == cache);
583 :
584 : /* delink from member tuples */
585 235324 : for (i = cl->n_members; --i >= 0;)
586 : {
587 165354 : CatCTup *ct = cl->members[i];
588 :
589 : Assert(ct->c_list == cl);
590 165354 : ct->c_list = NULL;
591 : /* if the member is dead and now has no references, remove it */
592 165354 : if (
593 : #ifndef CATCACHE_FORCE_RELEASE
594 165354 : ct->dead &&
595 : #endif
596 72 : ct->refcount == 0)
597 72 : CatCacheRemoveCTup(cache, ct);
598 : }
599 :
600 : /* delink from linked list */
601 69970 : dlist_delete(&cl->cache_elem);
602 :
603 : /* free associated column data */
604 69970 : CatCacheFreeKeys(cache->cc_tupdesc, cl->nkeys,
605 69970 : cache->cc_keyno, cl->keys);
606 :
607 69970 : pfree(cl);
608 :
609 69970 : --cache->cc_nlist;
610 69970 : }
611 :
612 :
613 : /*
614 : * CatCacheInvalidate
615 : *
616 : * Invalidate entries in the specified cache, given a hash value.
617 : *
618 : * We delete cache entries that match the hash value, whether positive
619 : * or negative. We don't care whether the invalidation is the result
620 : * of a tuple insertion or a deletion.
621 : *
622 : * We used to try to match positive cache entries by TID, but that is
623 : * unsafe after a VACUUM FULL on a system catalog: an inval event could
624 : * be queued before VACUUM FULL, and then processed afterwards, when the
625 : * target tuple that has to be invalidated has a different TID than it
626 : * did when the event was created. So now we just compare hash values and
627 : * accept the small risk of unnecessary invalidations due to false matches.
628 : *
629 : * This routine is only quasi-public: it should only be used by inval.c.
630 : */
631 : void
632 12520399 : CatCacheInvalidate(CatCache *cache, uint32 hashValue)
633 : {
634 : Index hashIndex;
635 : dlist_mutable_iter iter;
636 :
637 : CACHE_elog(DEBUG2, "CatCacheInvalidate: called");
638 :
639 : /*
640 : * We don't bother to check whether the cache has finished initialization
641 : * yet; if not, there will be no entries in it so no problem.
642 : */
643 :
644 : /*
645 : * Invalidate *all* CatCLists in this cache; it's too hard to tell which
646 : * searches might still be correct, so just zap 'em all.
647 : */
648 14805167 : for (int i = 0; i < cache->cc_nlbuckets; i++)
649 : {
650 2284768 : dlist_head *bucket = &cache->cc_lbucket[i];
651 :
652 2351764 : dlist_foreach_modify(iter, bucket)
653 : {
654 66996 : CatCList *cl = dlist_container(CatCList, cache_elem, iter.cur);
655 :
656 66996 : if (cl->refcount > 0)
657 72 : cl->dead = true;
658 : else
659 66924 : CatCacheRemoveCList(cache, cl);
660 : }
661 : }
662 :
663 : /*
664 : * inspect the proper hash bucket for tuple matches
665 : */
666 12520399 : hashIndex = HASH_INDEX(hashValue, cache->cc_nbuckets);
667 17138084 : dlist_foreach_modify(iter, &cache->cc_bucket[hashIndex])
668 : {
669 4617685 : CatCTup *ct = dlist_container(CatCTup, cache_elem, iter.cur);
670 :
671 4617685 : if (hashValue == ct->hash_value)
672 : {
673 734705 : if (ct->refcount > 0 ||
674 733955 : (ct->c_list && ct->c_list->refcount > 0))
675 : {
676 822 : ct->dead = true;
677 : /* list, if any, was marked dead above */
678 822 : Assert(ct->c_list == NULL || ct->c_list->dead);
679 : }
680 : else
681 733883 : CatCacheRemoveCTup(cache, ct);
682 : CACHE_elog(DEBUG2, "CatCacheInvalidate: invalidated");
683 : #ifdef CATCACHE_STATS
684 : cache->cc_invals++;
685 : #endif
686 : /* could be multiple matches, so keep looking! */
687 : }
688 : }
689 :
690 : /* Also invalidate any entries that are being built */
691 12600961 : for (CatCInProgress *e = catcache_in_progress_stack; e != NULL; e = e->next)
692 : {
693 80562 : if (e->cache == cache)
694 : {
695 247 : if (e->list || e->hash_value == hashValue)
696 231 : e->dead = true;
697 : }
698 : }
699 12520399 : }
700 :
701 : /* ----------------------------------------------------------------
702 : * public functions
703 : * ----------------------------------------------------------------
704 : */
705 :
706 :
707 : /*
708 : * Standard routine for creating cache context if it doesn't exist yet
709 : *
710 : * There are a lot of places (probably far more than necessary) that check
711 : * whether CacheMemoryContext exists yet and want to create it if not.
712 : * We centralize knowledge of exactly how to create it here.
713 : */
714 : void
715 18550 : CreateCacheMemoryContext(void)
716 : {
717 : /*
718 : * Purely for paranoia, check that context doesn't exist; caller probably
719 : * did so already.
720 : */
721 18550 : if (!CacheMemoryContext)
722 18550 : CacheMemoryContext = AllocSetContextCreate(TopMemoryContext,
723 : "CacheMemoryContext",
724 : ALLOCSET_DEFAULT_SIZES);
725 18550 : }
726 :
727 :
728 : /*
729 : * ResetCatalogCache
730 : *
731 : * Reset one catalog cache to empty.
732 : *
733 : * This is not very efficient if the target cache is nearly empty.
734 : * However, it shouldn't need to be efficient; we don't invoke it often.
735 : *
736 : * If 'debug_discard' is true, we are being called as part of
737 : * debug_discard_caches. In that case, the cache is not reset for
738 : * correctness, but just to get more testing of cache invalidation. We skip
739 : * resetting in-progress build entries in that case, or we'd never make any
740 : * progress.
741 : */
742 : static void
743 187443 : ResetCatalogCache(CatCache *cache, bool debug_discard)
744 : {
745 : dlist_mutable_iter iter;
746 : int i;
747 :
748 : /* Remove each list in this cache, or at least mark it dead */
749 211251 : for (i = 0; i < cache->cc_nlbuckets; i++)
750 : {
751 23808 : dlist_head *bucket = &cache->cc_lbucket[i];
752 :
753 26851 : dlist_foreach_modify(iter, bucket)
754 : {
755 3043 : CatCList *cl = dlist_container(CatCList, cache_elem, iter.cur);
756 :
757 3043 : if (cl->refcount > 0)
758 0 : cl->dead = true;
759 : else
760 3043 : CatCacheRemoveCList(cache, cl);
761 : }
762 : }
763 :
764 : /* Remove each tuple in this cache, or at least mark it dead */
765 5613973 : for (i = 0; i < cache->cc_nbuckets; i++)
766 : {
767 5426530 : dlist_head *bucket = &cache->cc_bucket[i];
768 :
769 5537294 : dlist_foreach_modify(iter, bucket)
770 : {
771 110764 : CatCTup *ct = dlist_container(CatCTup, cache_elem, iter.cur);
772 :
773 110764 : if (ct->refcount > 0 ||
774 110761 : (ct->c_list && ct->c_list->refcount > 0))
775 : {
776 3 : ct->dead = true;
777 : /* list, if any, was marked dead above */
778 3 : Assert(ct->c_list == NULL || ct->c_list->dead);
779 : }
780 : else
781 110761 : CatCacheRemoveCTup(cache, ct);
782 : #ifdef CATCACHE_STATS
783 : cache->cc_invals++;
784 : #endif
785 : }
786 : }
787 :
788 : /* Also invalidate any entries that are being built */
789 187443 : if (!debug_discard)
790 : {
791 188038 : for (CatCInProgress *e = catcache_in_progress_stack; e != NULL; e = e->next)
792 : {
793 595 : if (e->cache == cache)
794 7 : e->dead = true;
795 : }
796 : }
797 187443 : }
798 :
799 : /*
800 : * ResetCatalogCaches
801 : *
802 : * Reset all caches when a shared cache inval event forces it
803 : */
804 : void
805 0 : ResetCatalogCaches(void)
806 : {
807 0 : ResetCatalogCachesExt(false);
808 0 : }
809 :
810 : void
811 2199 : ResetCatalogCachesExt(bool debug_discard)
812 : {
813 : slist_iter iter;
814 :
815 : CACHE_elog(DEBUG2, "ResetCatalogCaches called");
816 :
817 189114 : slist_foreach(iter, &CacheHdr->ch_caches)
818 : {
819 186915 : CatCache *cache = slist_container(CatCache, cc_next, iter.cur);
820 :
821 186915 : ResetCatalogCache(cache, debug_discard);
822 : }
823 :
824 : CACHE_elog(DEBUG2, "end of ResetCatalogCaches call");
825 2199 : }
826 :
827 : /*
828 : * CatalogCacheFlushCatalog
829 : *
830 : * Flush all catcache entries that came from the specified system catalog.
831 : * This is needed after VACUUM FULL/CLUSTER on the catalog, since the
832 : * tuples very likely now have different TIDs than before. (At one point
833 : * we also tried to force re-execution of CatalogCacheInitializeCache for
834 : * the cache(s) on that catalog. This is a bad idea since it leads to all
835 : * kinds of trouble if a cache flush occurs while loading cache entries.
836 : * We now avoid the need to do it by copying cc_tupdesc out of the relcache,
837 : * rather than relying on the relcache to keep a tupdesc for us. Of course
838 : * this assumes the tupdesc of a cacheable system table will not change...)
839 : */
840 : void
841 390 : CatalogCacheFlushCatalog(Oid catId)
842 : {
843 : slist_iter iter;
844 :
845 : CACHE_elog(DEBUG2, "CatalogCacheFlushCatalog called for %u", catId);
846 :
847 33540 : slist_foreach(iter, &CacheHdr->ch_caches)
848 : {
849 33150 : CatCache *cache = slist_container(CatCache, cc_next, iter.cur);
850 :
851 : /* Does this cache store tuples of the target catalog? */
852 33150 : if (cache->cc_reloid == catId)
853 : {
854 : /* Yes, so flush all its contents */
855 528 : ResetCatalogCache(cache, false);
856 :
857 : /* Tell inval.c to call syscache callbacks for this cache */
858 528 : CallSyscacheCallbacks(cache->id, 0);
859 : }
860 : }
861 :
862 : CACHE_elog(DEBUG2, "end of CatalogCacheFlushCatalog call");
863 390 : }
864 :
865 : /*
866 : * InitCatCache
867 : *
868 : * This allocates and initializes a cache for a system catalog relation.
869 : * Actually, the cache is only partially initialized to avoid opening the
870 : * relation. The relation will be opened and the rest of the cache
871 : * structure initialized on the first access.
872 : */
873 : #ifdef CACHEDEBUG
874 : #define InitCatCache_DEBUG2 \
875 : do { \
876 : elog(DEBUG2, "InitCatCache: rel=%u ind=%u id=%d nkeys=%d size=%d", \
877 : cp->cc_reloid, cp->cc_indexoid, cp->id, \
878 : cp->cc_nkeys, cp->cc_nbuckets); \
879 : } while(0)
880 : #else
881 : #define InitCatCache_DEBUG2
882 : #endif
883 :
884 : CatCache *
885 1576750 : InitCatCache(int id,
886 : Oid reloid,
887 : Oid indexoid,
888 : int nkeys,
889 : const int *key,
890 : int nbuckets)
891 : {
892 : CatCache *cp;
893 : MemoryContext oldcxt;
894 : int i;
895 :
896 : /*
897 : * nbuckets is the initial number of hash buckets to use in this catcache.
898 : * It will be enlarged later if it becomes too full.
899 : *
900 : * nbuckets must be a power of two. We check this via Assert rather than
901 : * a full runtime check because the values will be coming from constant
902 : * tables.
903 : *
904 : * If you're confused by the power-of-two check, see comments in
905 : * bitmapset.c for an explanation.
906 : */
907 : Assert(nbuckets > 0 && (nbuckets & -nbuckets) == nbuckets);
908 :
909 : /*
910 : * first switch to the cache context so our allocations do not vanish at
911 : * the end of a transaction
912 : */
913 1576750 : if (!CacheMemoryContext)
914 0 : CreateCacheMemoryContext();
915 :
916 1576750 : oldcxt = MemoryContextSwitchTo(CacheMemoryContext);
917 :
918 : /*
919 : * if first time through, initialize the cache group header
920 : */
921 1576750 : if (CacheHdr == NULL)
922 : {
923 18550 : CacheHdr = palloc_object(CatCacheHeader);
924 18550 : slist_init(&CacheHdr->ch_caches);
925 18550 : CacheHdr->ch_ntup = 0;
926 : #ifdef CATCACHE_STATS
927 : /* set up to dump stats at backend exit */
928 : on_proc_exit(CatCachePrintStats, 0);
929 : #endif
930 : }
931 :
932 : /*
933 : * Allocate a new cache structure, aligning to a cacheline boundary
934 : *
935 : * Note: we rely on zeroing to initialize all the dlist headers correctly
936 : */
937 1576750 : cp = (CatCache *) palloc_aligned(sizeof(CatCache), PG_CACHE_LINE_SIZE,
938 : MCXT_ALLOC_ZERO);
939 1576750 : cp->cc_bucket = palloc0(nbuckets * sizeof(dlist_head));
940 :
941 : /*
942 : * Many catcaches never receive any list searches. Therefore, we don't
943 : * allocate the cc_lbuckets till we get a list search.
944 : */
945 1576750 : cp->cc_lbucket = NULL;
946 :
947 : /*
948 : * initialize the cache's relation information for the relation
949 : * corresponding to this cache, and initialize some of the new cache's
950 : * other internal fields. But don't open the relation yet.
951 : */
952 1576750 : cp->id = id;
953 1576750 : cp->cc_relname = "(not known yet)";
954 1576750 : cp->cc_reloid = reloid;
955 1576750 : cp->cc_indexoid = indexoid;
956 1576750 : cp->cc_relisshared = false; /* temporary */
957 1576750 : cp->cc_tupdesc = (TupleDesc) NULL;
958 1576750 : cp->cc_ntup = 0;
959 1576750 : cp->cc_nlist = 0;
960 1576750 : cp->cc_nbuckets = nbuckets;
961 1576750 : cp->cc_nlbuckets = 0;
962 1576750 : cp->cc_nkeys = nkeys;
963 4118100 : for (i = 0; i < nkeys; ++i)
964 : {
965 : Assert(AttributeNumberIsValid(key[i]));
966 2541350 : cp->cc_keyno[i] = key[i];
967 : }
968 :
969 : /*
970 : * new cache is initialized as far as we can go for now. print some
971 : * debugging information, if appropriate.
972 : */
973 : InitCatCache_DEBUG2;
974 :
975 : /*
976 : * add completed cache to top of group header's list
977 : */
978 1576750 : slist_push_head(&CacheHdr->ch_caches, &cp->cc_next);
979 :
980 : /*
981 : * back to the old context before we return...
982 : */
983 1576750 : MemoryContextSwitchTo(oldcxt);
984 :
985 1576750 : return cp;
986 : }
987 :
988 : /*
989 : * Enlarge a catcache, doubling the number of buckets.
990 : */
991 : static void
992 3363 : RehashCatCache(CatCache *cp)
993 : {
994 : dlist_head *newbucket;
995 : int newnbuckets;
996 : int i;
997 :
998 3363 : elog(DEBUG1, "rehashing catalog cache id %d for %s; %d tups, %d buckets",
999 : cp->id, cp->cc_relname, cp->cc_ntup, cp->cc_nbuckets);
1000 :
1001 : /* Allocate a new, larger, hash table. */
1002 3363 : newnbuckets = cp->cc_nbuckets * 2;
1003 3363 : newbucket = (dlist_head *) MemoryContextAllocZero(CacheMemoryContext, newnbuckets * sizeof(dlist_head));
1004 :
1005 : /* Move all entries from old hash table to new. */
1006 327413 : for (i = 0; i < cp->cc_nbuckets; i++)
1007 : {
1008 : dlist_mutable_iter iter;
1009 :
1010 975513 : dlist_foreach_modify(iter, &cp->cc_bucket[i])
1011 : {
1012 651463 : CatCTup *ct = dlist_container(CatCTup, cache_elem, iter.cur);
1013 651463 : int hashIndex = HASH_INDEX(ct->hash_value, newnbuckets);
1014 :
1015 651463 : dlist_delete(iter.cur);
1016 :
1017 : /*
1018 : * Note that each item is pushed at the tail of the new bucket,
1019 : * not its head. This is consistent with the SearchCatCache*()
1020 : * routines, where matching entries are moved at the front of the
1021 : * list to speed subsequent searches.
1022 : */
1023 651463 : dlist_push_tail(&newbucket[hashIndex], &ct->cache_elem);
1024 : }
1025 : }
1026 :
1027 : /* Switch to the new array. */
1028 3363 : pfree(cp->cc_bucket);
1029 3363 : cp->cc_nbuckets = newnbuckets;
1030 3363 : cp->cc_bucket = newbucket;
1031 3363 : }
1032 :
1033 : /*
1034 : * Enlarge a catcache's list storage, doubling the number of buckets.
1035 : */
1036 : static void
1037 618 : RehashCatCacheLists(CatCache *cp)
1038 : {
1039 : dlist_head *newbucket;
1040 : int newnbuckets;
1041 : int i;
1042 :
1043 618 : elog(DEBUG1, "rehashing catalog cache id %d for %s; %d lists, %d buckets",
1044 : cp->id, cp->cc_relname, cp->cc_nlist, cp->cc_nlbuckets);
1045 :
1046 : /* Allocate a new, larger, hash table. */
1047 618 : newnbuckets = cp->cc_nlbuckets * 2;
1048 618 : newbucket = (dlist_head *) MemoryContextAllocZero(CacheMemoryContext, newnbuckets * sizeof(dlist_head));
1049 :
1050 : /* Move all entries from old hash table to new. */
1051 23018 : for (i = 0; i < cp->cc_nlbuckets; i++)
1052 : {
1053 : dlist_mutable_iter iter;
1054 :
1055 67818 : dlist_foreach_modify(iter, &cp->cc_lbucket[i])
1056 : {
1057 45418 : CatCList *cl = dlist_container(CatCList, cache_elem, iter.cur);
1058 45418 : int hashIndex = HASH_INDEX(cl->hash_value, newnbuckets);
1059 :
1060 45418 : dlist_delete(iter.cur);
1061 :
1062 : /*
1063 : * Note that each item is pushed at the tail of the new bucket,
1064 : * not its head. This is consistent with the SearchCatCache*()
1065 : * routines, where matching entries are moved at the front of the
1066 : * list to speed subsequent searches.
1067 : */
1068 45418 : dlist_push_tail(&newbucket[hashIndex], &cl->cache_elem);
1069 : }
1070 : }
1071 :
1072 : /* Switch to the new array. */
1073 618 : pfree(cp->cc_lbucket);
1074 618 : cp->cc_nlbuckets = newnbuckets;
1075 618 : cp->cc_lbucket = newbucket;
1076 618 : }
1077 :
1078 : /*
1079 : * ConditionalCatalogCacheInitializeCache
1080 : *
1081 : * Call CatalogCacheInitializeCache() if not yet done.
1082 : */
1083 : pg_attribute_always_inline
1084 : static void
1085 56322773 : ConditionalCatalogCacheInitializeCache(CatCache *cache)
1086 : {
1087 : #ifdef USE_ASSERT_CHECKING
1088 : /*
1089 : * TypeCacheRelCallback() runs outside transactions and relies on TYPEOID
1090 : * for hashing. This isn't ideal. Since lookup_type_cache() both
1091 : * registers the callback and searches TYPEOID, reaching trouble likely
1092 : * requires OOM at an unlucky moment.
1093 : *
1094 : * InvalidateAttoptCacheCallback() runs outside transactions and likewise
1095 : * relies on ATTNUM. InitPostgres() initializes ATTNUM, so it's reliable.
1096 : */
1097 : if (!(cache->id == TYPEOID || cache->id == ATTNUM) ||
1098 : IsTransactionState())
1099 : AssertCouldGetRelation();
1100 : else
1101 : Assert(cache->cc_tupdesc != NULL);
1102 : #endif
1103 :
1104 56322773 : if (unlikely(cache->cc_tupdesc == NULL))
1105 412752 : CatalogCacheInitializeCache(cache);
1106 56322773 : }
1107 :
1108 : /*
1109 : * CatalogCacheInitializeCache
1110 : *
1111 : * This function does final initialization of a catcache: obtain the tuple
1112 : * descriptor and set up the hash and equality function links.
1113 : */
1114 : #ifdef CACHEDEBUG
1115 : #define CatalogCacheInitializeCache_DEBUG1 \
1116 : elog(DEBUG2, "CatalogCacheInitializeCache: cache @%p rel=%u", cache, \
1117 : cache->cc_reloid)
1118 :
1119 : #define CatalogCacheInitializeCache_DEBUG2 \
1120 : do { \
1121 : if (cache->cc_keyno[i] > 0) { \
1122 : elog(DEBUG2, "CatalogCacheInitializeCache: load %d/%d w/%d, %u", \
1123 : i+1, cache->cc_nkeys, cache->cc_keyno[i], \
1124 : TupleDescAttr(tupdesc, cache->cc_keyno[i] - 1)->atttypid); \
1125 : } else { \
1126 : elog(DEBUG2, "CatalogCacheInitializeCache: load %d/%d w/%d", \
1127 : i+1, cache->cc_nkeys, cache->cc_keyno[i]); \
1128 : } \
1129 : } while(0)
1130 : #else
1131 : #define CatalogCacheInitializeCache_DEBUG1
1132 : #define CatalogCacheInitializeCache_DEBUG2
1133 : #endif
1134 :
1135 : static void
1136 412752 : CatalogCacheInitializeCache(CatCache *cache)
1137 : {
1138 : Relation relation;
1139 : MemoryContext oldcxt;
1140 : TupleDesc tupdesc;
1141 : int i;
1142 :
1143 : CatalogCacheInitializeCache_DEBUG1;
1144 :
1145 412752 : relation = table_open(cache->cc_reloid, AccessShareLock);
1146 :
1147 : /*
1148 : * switch to the cache context so our allocations do not vanish at the end
1149 : * of a transaction
1150 : */
1151 : Assert(CacheMemoryContext != NULL);
1152 :
1153 412752 : oldcxt = MemoryContextSwitchTo(CacheMemoryContext);
1154 :
1155 : /*
1156 : * copy the relcache's tuple descriptor to permanent cache storage
1157 : */
1158 412752 : tupdesc = CreateTupleDescCopyConstr(RelationGetDescr(relation));
1159 :
1160 : /*
1161 : * save the relation's name and relisshared flag, too (cc_relname is used
1162 : * only for debugging purposes)
1163 : */
1164 412752 : cache->cc_relname = pstrdup(RelationGetRelationName(relation));
1165 412752 : cache->cc_relisshared = RelationGetForm(relation)->relisshared;
1166 :
1167 : /*
1168 : * return to the caller's memory context and close the rel
1169 : */
1170 412752 : MemoryContextSwitchTo(oldcxt);
1171 :
1172 412752 : table_close(relation, AccessShareLock);
1173 :
1174 : CACHE_elog(DEBUG2, "CatalogCacheInitializeCache: %s, %d keys",
1175 : cache->cc_relname, cache->cc_nkeys);
1176 :
1177 : /*
1178 : * initialize cache's key information
1179 : */
1180 1065310 : for (i = 0; i < cache->cc_nkeys; ++i)
1181 : {
1182 : Oid keytype;
1183 : RegProcedure eqfunc;
1184 :
1185 : CatalogCacheInitializeCache_DEBUG2;
1186 :
1187 652558 : if (cache->cc_keyno[i] > 0)
1188 : {
1189 652558 : Form_pg_attribute attr = TupleDescAttr(tupdesc,
1190 652558 : cache->cc_keyno[i] - 1);
1191 :
1192 652558 : keytype = attr->atttypid;
1193 : /* cache key columns should always be NOT NULL */
1194 : Assert(attr->attnotnull);
1195 : }
1196 : else
1197 : {
1198 0 : if (cache->cc_keyno[i] < 0)
1199 0 : elog(FATAL, "sys attributes are not supported in caches");
1200 0 : keytype = OIDOID;
1201 : }
1202 :
1203 652558 : GetCCHashEqFuncs(keytype,
1204 : &cache->cc_hashfunc[i],
1205 : &eqfunc,
1206 : &cache->cc_fastequal[i]);
1207 :
1208 : /*
1209 : * Do equality-function lookup (we assume this won't need a catalog
1210 : * lookup for any supported type)
1211 : */
1212 652558 : fmgr_info_cxt(eqfunc,
1213 : &cache->cc_skey[i].sk_func,
1214 : CacheMemoryContext);
1215 :
1216 : /* Initialize sk_attno suitably for HeapKeyTest() and heap scans */
1217 652558 : cache->cc_skey[i].sk_attno = cache->cc_keyno[i];
1218 :
1219 : /* Fill in sk_strategy as well --- always standard equality */
1220 652558 : cache->cc_skey[i].sk_strategy = BTEqualStrategyNumber;
1221 652558 : cache->cc_skey[i].sk_subtype = InvalidOid;
1222 : /* If a catcache key requires a collation, it must be C collation */
1223 652558 : cache->cc_skey[i].sk_collation = C_COLLATION_OID;
1224 :
1225 : CACHE_elog(DEBUG2, "CatalogCacheInitializeCache %s %d %p",
1226 : cache->cc_relname, i, cache);
1227 : }
1228 :
1229 : /*
1230 : * mark this cache fully initialized
1231 : */
1232 412752 : cache->cc_tupdesc = tupdesc;
1233 412752 : }
1234 :
1235 : /*
1236 : * InitCatCachePhase2 -- external interface for CatalogCacheInitializeCache
1237 : *
1238 : * One reason to call this routine is to ensure that the relcache has
1239 : * created entries for all the catalogs and indexes referenced by catcaches.
1240 : * Therefore, provide an option to open the index as well as fixing the
1241 : * cache itself. An exception is the indexes on pg_am, which we don't use
1242 : * (cf. IndexScanOK).
1243 : */
1244 : void
1245 181988 : InitCatCachePhase2(CatCache *cache, bool touch_index)
1246 : {
1247 181988 : ConditionalCatalogCacheInitializeCache(cache);
1248 :
1249 181988 : if (touch_index &&
1250 164305 : cache->id != AMOID &&
1251 162372 : cache->id != AMNAME)
1252 : {
1253 : Relation idesc;
1254 :
1255 : /*
1256 : * We must lock the underlying catalog before opening the index to
1257 : * avoid deadlock, since index_open could possibly result in reading
1258 : * this same catalog, and if anyone else is exclusive-locking this
1259 : * catalog and index they'll be doing it in that order.
1260 : */
1261 160439 : LockRelationOid(cache->cc_reloid, AccessShareLock);
1262 160439 : idesc = index_open(cache->cc_indexoid, AccessShareLock);
1263 :
1264 : /*
1265 : * While we've got the index open, let's check that it's unique (and
1266 : * not just deferrable-unique, thank you very much). This is just to
1267 : * catch thinkos in definitions of new catcaches, so we don't worry
1268 : * about the pg_am indexes not getting tested.
1269 : */
1270 : Assert(idesc->rd_index->indisunique &&
1271 : idesc->rd_index->indimmediate);
1272 :
1273 160439 : index_close(idesc, AccessShareLock);
1274 160439 : UnlockRelationOid(cache->cc_reloid, AccessShareLock);
1275 : }
1276 181988 : }
1277 :
1278 :
1279 : /*
1280 : * IndexScanOK
1281 : *
1282 : * This function checks for tuples that will be fetched by
1283 : * IndexSupportInitialize() during relcache initialization for
1284 : * certain system indexes that support critical syscaches.
1285 : * We can't use an indexscan to fetch these, else we'll get into
1286 : * infinite recursion. A plain heap scan will work, however.
1287 : * Once we have completed relcache initialization (signaled by
1288 : * criticalRelcachesBuilt), we don't have to worry anymore.
1289 : *
1290 : * Similarly, during backend startup we have to be able to use the
1291 : * pg_authid, pg_auth_members and pg_database syscaches for
1292 : * authentication even if we don't yet have relcache entries for those
1293 : * catalogs' indexes.
1294 : */
1295 : static bool
1296 3614617 : IndexScanOK(CatCache *cache)
1297 : {
1298 3614617 : switch (cache->id)
1299 : {
1300 376155 : case INDEXRELID:
1301 :
1302 : /*
1303 : * Rather than tracking exactly which indexes have to be loaded
1304 : * before we can use indexscans (which changes from time to time),
1305 : * just force all pg_index searches to be heap scans until we've
1306 : * built the critical relcaches.
1307 : */
1308 376155 : if (!criticalRelcachesBuilt)
1309 20243 : return false;
1310 355912 : break;
1311 :
1312 32611 : case AMOID:
1313 : case AMNAME:
1314 :
1315 : /*
1316 : * Always do heap scans in pg_am, because it's so small there's
1317 : * not much point in an indexscan anyway. We *must* do this when
1318 : * initially building critical relcache entries, but we might as
1319 : * well just always do it.
1320 : */
1321 32611 : return false;
1322 :
1323 59152 : case AUTHNAME:
1324 : case AUTHOID:
1325 : case AUTHMEMMEMROLE:
1326 : case DATABASEOID:
1327 :
1328 : /*
1329 : * Protect authentication lookups occurring before relcache has
1330 : * collected entries for shared indexes.
1331 : */
1332 59152 : if (!criticalSharedRelcachesBuilt)
1333 2583 : return false;
1334 56569 : break;
1335 :
1336 3146699 : default:
1337 3146699 : break;
1338 : }
1339 :
1340 : /* Normal case, allow index scan */
1341 3559180 : return true;
1342 : }
1343 :
1344 : /*
1345 : * SearchCatCache
1346 : *
1347 : * This call searches a system cache for a tuple, opening the relation
1348 : * if necessary (on the first access to a particular cache).
1349 : *
1350 : * The result is NULL if not found, or a pointer to a HeapTuple in
1351 : * the cache. The caller must not modify the tuple, and must call
1352 : * ReleaseCatCache() when done with it.
1353 : *
1354 : * The search key values should be expressed as Datums of the key columns'
1355 : * datatype(s). (Pass zeroes for any unused parameters.) As a special
1356 : * exception, the passed-in key for a NAME column can be just a C string;
1357 : * the caller need not go to the trouble of converting it to a fully
1358 : * null-padded NAME.
1359 : */
1360 : HeapTuple
1361 2986269 : SearchCatCache(CatCache *cache,
1362 : Datum v1,
1363 : Datum v2,
1364 : Datum v3,
1365 : Datum v4)
1366 : {
1367 2986269 : return SearchCatCacheInternal(cache, cache->cc_nkeys, v1, v2, v3, v4);
1368 : }
1369 :
1370 :
1371 : /*
1372 : * SearchCatCacheN() are SearchCatCache() versions for a specific number of
1373 : * arguments. The compiler can inline the body and unroll loops, making them a
1374 : * bit faster than SearchCatCache().
1375 : */
1376 :
1377 : HeapTuple
1378 38809672 : SearchCatCache1(CatCache *cache,
1379 : Datum v1)
1380 : {
1381 38809672 : return SearchCatCacheInternal(cache, 1, v1, 0, 0, 0);
1382 : }
1383 :
1384 :
1385 : HeapTuple
1386 3226314 : SearchCatCache2(CatCache *cache,
1387 : Datum v1, Datum v2)
1388 : {
1389 3226314 : return SearchCatCacheInternal(cache, 2, v1, v2, 0, 0);
1390 : }
1391 :
1392 :
1393 : HeapTuple
1394 3039187 : SearchCatCache3(CatCache *cache,
1395 : Datum v1, Datum v2, Datum v3)
1396 : {
1397 3039187 : return SearchCatCacheInternal(cache, 3, v1, v2, v3, 0);
1398 : }
1399 :
1400 :
1401 : HeapTuple
1402 2357164 : SearchCatCache4(CatCache *cache,
1403 : Datum v1, Datum v2, Datum v3, Datum v4)
1404 : {
1405 2357164 : return SearchCatCacheInternal(cache, 4, v1, v2, v3, v4);
1406 : }
1407 :
1408 : /*
1409 : * Work-horse for SearchCatCache/SearchCatCacheN.
1410 : */
1411 : static inline HeapTuple
1412 50418606 : SearchCatCacheInternal(CatCache *cache,
1413 : int nkeys,
1414 : Datum v1,
1415 : Datum v2,
1416 : Datum v3,
1417 : Datum v4)
1418 : {
1419 : Datum arguments[CATCACHE_MAXKEYS];
1420 : uint32 hashValue;
1421 : Index hashIndex;
1422 : dlist_iter iter;
1423 : dlist_head *bucket;
1424 : CatCTup *ct;
1425 :
1426 : Assert(cache->cc_nkeys == nkeys);
1427 :
1428 : /*
1429 : * one-time startup overhead for each cache
1430 : */
1431 50418606 : ConditionalCatalogCacheInitializeCache(cache);
1432 :
1433 : #ifdef CATCACHE_STATS
1434 : cache->cc_searches++;
1435 : #endif
1436 :
1437 : /* Initialize local parameter array */
1438 50418606 : arguments[0] = v1;
1439 50418606 : arguments[1] = v2;
1440 50418606 : arguments[2] = v3;
1441 50418606 : arguments[3] = v4;
1442 :
1443 : /*
1444 : * find the hash bucket in which to look for the tuple
1445 : */
1446 50418606 : hashValue = CatalogCacheComputeHashValue(cache, nkeys, v1, v2, v3, v4);
1447 50418606 : hashIndex = HASH_INDEX(hashValue, cache->cc_nbuckets);
1448 :
1449 : /*
1450 : * scan the hash bucket until we find a match or exhaust our tuples
1451 : *
1452 : * Note: it's okay to use dlist_foreach here, even though we modify the
1453 : * dlist within the loop, because we don't continue the loop afterwards.
1454 : */
1455 50418606 : bucket = &cache->cc_bucket[hashIndex];
1456 54052126 : dlist_foreach(iter, bucket)
1457 : {
1458 50602101 : ct = dlist_container(CatCTup, cache_elem, iter.cur);
1459 :
1460 50602101 : if (ct->dead)
1461 0 : continue; /* ignore dead entries */
1462 :
1463 50602101 : if (ct->hash_value != hashValue)
1464 3633520 : continue; /* quickly skip entry if wrong hash val */
1465 :
1466 46968581 : if (!CatalogCacheCompareTuple(cache, nkeys, ct->keys, arguments))
1467 0 : continue;
1468 :
1469 : /*
1470 : * We found a match in the cache. Move it to the front of the list
1471 : * for its hashbucket, in order to speed subsequent searches. (The
1472 : * most frequently accessed elements in any hashbucket will tend to be
1473 : * near the front of the hashbucket's list.)
1474 : */
1475 46968581 : dlist_move_head(bucket, &ct->cache_elem);
1476 :
1477 : /*
1478 : * If it's a positive entry, bump its refcount and return it. If it's
1479 : * negative, we can report failure to the caller.
1480 : */
1481 46968581 : if (!ct->negative)
1482 : {
1483 44707519 : ResourceOwnerEnlarge(CurrentResourceOwner);
1484 44707519 : ct->refcount++;
1485 44707519 : ResourceOwnerRememberCatCacheRef(CurrentResourceOwner, &ct->tuple);
1486 :
1487 : CACHE_elog(DEBUG2, "SearchCatCache(%s): found in bucket %d",
1488 : cache->cc_relname, hashIndex);
1489 :
1490 : #ifdef CATCACHE_STATS
1491 : cache->cc_hits++;
1492 : #endif
1493 :
1494 44707519 : return &ct->tuple;
1495 : }
1496 : else
1497 : {
1498 : CACHE_elog(DEBUG2, "SearchCatCache(%s): found neg entry in bucket %d",
1499 : cache->cc_relname, hashIndex);
1500 :
1501 : #ifdef CATCACHE_STATS
1502 : cache->cc_neg_hits++;
1503 : #endif
1504 :
1505 2261062 : return NULL;
1506 : }
1507 : }
1508 :
1509 3450025 : return SearchCatCacheMiss(cache, nkeys, hashValue, hashIndex, v1, v2, v3, v4);
1510 : }
1511 :
1512 : /*
1513 : * Search the actual catalogs, rather than the cache.
1514 : *
1515 : * This is kept separate from SearchCatCacheInternal() to keep the fast-path
1516 : * as small as possible. To avoid that effort being undone by a helpful
1517 : * compiler, try to explicitly forbid inlining.
1518 : */
1519 : static pg_noinline HeapTuple
1520 3450025 : SearchCatCacheMiss(CatCache *cache,
1521 : int nkeys,
1522 : uint32 hashValue,
1523 : Index hashIndex,
1524 : Datum v1,
1525 : Datum v2,
1526 : Datum v3,
1527 : Datum v4)
1528 : {
1529 : ScanKeyData cur_skey[CATCACHE_MAXKEYS];
1530 : Relation relation;
1531 : SysScanDesc scandesc;
1532 : HeapTuple ntp;
1533 : CatCTup *ct;
1534 : bool stale;
1535 : Datum arguments[CATCACHE_MAXKEYS];
1536 :
1537 : /* Initialize local parameter array */
1538 3450025 : arguments[0] = v1;
1539 3450025 : arguments[1] = v2;
1540 3450025 : arguments[2] = v3;
1541 3450025 : arguments[3] = v4;
1542 :
1543 : /*
1544 : * Tuple was not found in cache, so we have to try to retrieve it directly
1545 : * from the relation. If found, we will add it to the cache; if not
1546 : * found, we will add a negative cache entry instead.
1547 : *
1548 : * NOTE: it is possible for recursive cache lookups to occur while reading
1549 : * the relation --- for example, due to shared-cache-inval messages being
1550 : * processed during table_open(). This is OK. It's even possible for one
1551 : * of those lookups to find and enter the very same tuple we are trying to
1552 : * fetch here. If that happens, we will enter a second copy of the tuple
1553 : * into the cache. The first copy will never be referenced again, and
1554 : * will eventually age out of the cache, so there's no functional problem.
1555 : * This case is rare enough that it's not worth expending extra cycles to
1556 : * detect.
1557 : *
1558 : * Another case, which we *must* handle, is that the tuple could become
1559 : * outdated during CatalogCacheCreateEntry's attempt to detoast it (since
1560 : * AcceptInvalidationMessages can run during TOAST table access). We do
1561 : * not want to return already-stale catcache entries, so we loop around
1562 : * and do the table scan again if that happens.
1563 : */
1564 3450025 : relation = table_open(cache->cc_reloid, AccessShareLock);
1565 :
1566 : /*
1567 : * Ok, need to make a lookup in the relation, copy the scankey and fill
1568 : * out any per-call fields.
1569 : */
1570 3450025 : memcpy(cur_skey, cache->cc_skey, sizeof(ScanKeyData) * nkeys);
1571 3450025 : cur_skey[0].sk_argument = v1;
1572 3450025 : cur_skey[1].sk_argument = v2;
1573 3450025 : cur_skey[2].sk_argument = v3;
1574 3450025 : cur_skey[3].sk_argument = v4;
1575 :
1576 : do
1577 : {
1578 3450025 : scandesc = systable_beginscan(relation,
1579 : cache->cc_indexoid,
1580 3450025 : IndexScanOK(cache),
1581 : NULL,
1582 : nkeys,
1583 : cur_skey);
1584 :
1585 3450025 : ct = NULL;
1586 3450025 : stale = false;
1587 :
1588 3450025 : while (HeapTupleIsValid(ntp = systable_getnext(scandesc)))
1589 : {
1590 2527666 : ct = CatalogCacheCreateEntry(cache, ntp, NULL,
1591 : hashValue, hashIndex);
1592 : /* upon failure, we must start the scan over */
1593 2527666 : if (ct == NULL)
1594 : {
1595 0 : stale = true;
1596 0 : break;
1597 : }
1598 : /* immediately set the refcount to 1 */
1599 2527666 : ResourceOwnerEnlarge(CurrentResourceOwner);
1600 2527666 : ct->refcount++;
1601 2527666 : ResourceOwnerRememberCatCacheRef(CurrentResourceOwner, &ct->tuple);
1602 2527666 : break; /* assume only one match */
1603 : }
1604 :
1605 3450024 : systable_endscan(scandesc);
1606 3450024 : } while (stale);
1607 :
1608 3450024 : table_close(relation, AccessShareLock);
1609 :
1610 : /*
1611 : * If tuple was not found, we need to build a negative cache entry
1612 : * containing a fake tuple. The fake tuple has the correct key columns,
1613 : * but nulls everywhere else.
1614 : *
1615 : * In bootstrap mode, we don't build negative entries, because the cache
1616 : * invalidation mechanism isn't alive and can't clear them if the tuple
1617 : * gets created later. (Bootstrap doesn't do UPDATEs, so it doesn't need
1618 : * cache inval for that.)
1619 : */
1620 3450024 : if (ct == NULL)
1621 : {
1622 922358 : if (IsBootstrapProcessingMode())
1623 27540 : return NULL;
1624 :
1625 894818 : ct = CatalogCacheCreateEntry(cache, NULL, arguments,
1626 : hashValue, hashIndex);
1627 :
1628 : /* Creating a negative cache entry shouldn't fail */
1629 : Assert(ct != NULL);
1630 :
1631 : CACHE_elog(DEBUG2, "SearchCatCache(%s): Contains %d/%d tuples",
1632 : cache->cc_relname, cache->cc_ntup, CacheHdr->ch_ntup);
1633 : CACHE_elog(DEBUG2, "SearchCatCache(%s): put neg entry in bucket %d",
1634 : cache->cc_relname, hashIndex);
1635 :
1636 : /*
1637 : * We are not returning the negative entry to the caller, so leave its
1638 : * refcount zero.
1639 : */
1640 :
1641 894818 : return NULL;
1642 : }
1643 :
1644 : CACHE_elog(DEBUG2, "SearchCatCache(%s): Contains %d/%d tuples",
1645 : cache->cc_relname, cache->cc_ntup, CacheHdr->ch_ntup);
1646 : CACHE_elog(DEBUG2, "SearchCatCache(%s): put in bucket %d",
1647 : cache->cc_relname, hashIndex);
1648 :
1649 : #ifdef CATCACHE_STATS
1650 : cache->cc_newloads++;
1651 : #endif
1652 :
1653 2527666 : return &ct->tuple;
1654 : }
1655 :
1656 : /*
1657 : * ReleaseCatCache
1658 : *
1659 : * Decrement the reference count of a catcache entry (releasing the
1660 : * hold grabbed by a successful SearchCatCache).
1661 : *
1662 : * NOTE: if compiled with -DCATCACHE_FORCE_RELEASE then catcache entries
1663 : * will be freed as soon as their refcount goes to zero. In combination
1664 : * with aset.c's CLOBBER_FREED_MEMORY option, this provides a good test
1665 : * to catch references to already-released catcache entries.
1666 : */
1667 : void
1668 47229430 : ReleaseCatCache(HeapTuple tuple)
1669 : {
1670 47229430 : ReleaseCatCacheWithOwner(tuple, CurrentResourceOwner);
1671 47229430 : }
1672 :
1673 : static void
1674 47235185 : ReleaseCatCacheWithOwner(HeapTuple tuple, ResourceOwner resowner)
1675 : {
1676 47235185 : CatCTup *ct = (CatCTup *) (((char *) tuple) -
1677 : offsetof(CatCTup, tuple));
1678 :
1679 : /* Safety checks to ensure we were handed a cache entry */
1680 : Assert(ct->ct_magic == CT_MAGIC);
1681 : Assert(ct->refcount > 0);
1682 :
1683 47235185 : ct->refcount--;
1684 47235185 : if (resowner)
1685 47229430 : ResourceOwnerForgetCatCacheRef(resowner, &ct->tuple);
1686 :
1687 47235185 : if (
1688 : #ifndef CATCACHE_FORCE_RELEASE
1689 47235185 : ct->dead &&
1690 : #endif
1691 806 : ct->refcount == 0 &&
1692 746 : (ct->c_list == NULL || ct->c_list->refcount == 0))
1693 746 : CatCacheRemoveCTup(ct->my_cache, ct);
1694 47235185 : }
1695 :
1696 :
1697 : /*
1698 : * GetCatCacheHashValue
1699 : *
1700 : * Compute the hash value for a given set of search keys.
1701 : *
1702 : * The reason for exposing this as part of the API is that the hash value is
1703 : * exposed in cache invalidation operations, so there are places outside the
1704 : * catcache code that need to be able to compute the hash values.
1705 : */
1706 : uint32
1707 582480 : GetCatCacheHashValue(CatCache *cache,
1708 : Datum v1,
1709 : Datum v2,
1710 : Datum v3,
1711 : Datum v4)
1712 : {
1713 : /*
1714 : * one-time startup overhead for each cache
1715 : */
1716 582480 : ConditionalCatalogCacheInitializeCache(cache);
1717 :
1718 : /*
1719 : * calculate the hash value
1720 : */
1721 582480 : return CatalogCacheComputeHashValue(cache, cache->cc_nkeys, v1, v2, v3, v4);
1722 : }
1723 :
1724 :
1725 : /*
1726 : * SearchCatCacheList
1727 : *
1728 : * Generate a list of all tuples matching a partial key (that is,
1729 : * a key specifying just the first K of the cache's N key columns).
1730 : *
1731 : * It doesn't make any sense to specify all of the cache's key columns
1732 : * here: since the key is unique, there could be at most one match, so
1733 : * you ought to use SearchCatCache() instead. Hence this function takes
1734 : * one fewer Datum argument than SearchCatCache() does.
1735 : *
1736 : * The caller must not modify the list object or the pointed-to tuples,
1737 : * and must call ReleaseCatCacheList() when done with the list.
1738 : */
1739 : CatCList *
1740 2030289 : SearchCatCacheList(CatCache *cache,
1741 : int nkeys,
1742 : Datum v1,
1743 : Datum v2,
1744 : Datum v3)
1745 : {
1746 2030289 : Datum v4 = 0; /* dummy last-column value */
1747 : Datum arguments[CATCACHE_MAXKEYS];
1748 : uint32 lHashValue;
1749 : Index lHashIndex;
1750 : dlist_iter iter;
1751 : dlist_head *lbucket;
1752 : CatCList *cl;
1753 : CatCTup *ct;
1754 : List *volatile ctlist;
1755 : ListCell *ctlist_item;
1756 : int nmembers;
1757 : bool ordered;
1758 : HeapTuple ntp;
1759 : MemoryContext oldcxt;
1760 : int i;
1761 : CatCInProgress *save_in_progress;
1762 : CatCInProgress in_progress_ent;
1763 :
1764 : /*
1765 : * one-time startup overhead for each cache
1766 : */
1767 2030289 : ConditionalCatalogCacheInitializeCache(cache);
1768 :
1769 : Assert(nkeys > 0 && nkeys < cache->cc_nkeys);
1770 :
1771 : #ifdef CATCACHE_STATS
1772 : cache->cc_lsearches++;
1773 : #endif
1774 :
1775 : /* Initialize local parameter array */
1776 2030289 : arguments[0] = v1;
1777 2030289 : arguments[1] = v2;
1778 2030289 : arguments[2] = v3;
1779 2030289 : arguments[3] = v4;
1780 :
1781 : /*
1782 : * If we haven't previously done a list search in this cache, create the
1783 : * bucket header array; otherwise, consider whether it's time to enlarge
1784 : * it.
1785 : */
1786 2030289 : if (cache->cc_lbucket == NULL)
1787 : {
1788 : /* Arbitrary initial size --- must be a power of 2 */
1789 22150 : int nbuckets = 16;
1790 :
1791 22150 : cache->cc_lbucket = (dlist_head *)
1792 22150 : MemoryContextAllocZero(CacheMemoryContext,
1793 : nbuckets * sizeof(dlist_head));
1794 : /* Don't set cc_nlbuckets if we get OOM allocating cc_lbucket */
1795 22150 : cache->cc_nlbuckets = nbuckets;
1796 : }
1797 : else
1798 : {
1799 : /*
1800 : * If the hash table has become too full, enlarge the buckets array.
1801 : * Quite arbitrarily, we enlarge when fill factor > 2.
1802 : */
1803 2008139 : if (cache->cc_nlist > cache->cc_nlbuckets * 2)
1804 618 : RehashCatCacheLists(cache);
1805 : }
1806 :
1807 : /*
1808 : * Find the hash bucket in which to look for the CatCList.
1809 : */
1810 2030289 : lHashValue = CatalogCacheComputeHashValue(cache, nkeys, v1, v2, v3, v4);
1811 2030289 : lHashIndex = HASH_INDEX(lHashValue, cache->cc_nlbuckets);
1812 :
1813 : /*
1814 : * scan the items until we find a match or exhaust our list
1815 : *
1816 : * Note: it's okay to use dlist_foreach here, even though we modify the
1817 : * dlist within the loop, because we don't continue the loop afterwards.
1818 : */
1819 2030289 : lbucket = &cache->cc_lbucket[lHashIndex];
1820 2225554 : dlist_foreach(iter, lbucket)
1821 : {
1822 2060967 : cl = dlist_container(CatCList, cache_elem, iter.cur);
1823 :
1824 2060967 : if (cl->dead)
1825 0 : continue; /* ignore dead entries */
1826 :
1827 2060967 : if (cl->hash_value != lHashValue)
1828 195265 : continue; /* quickly skip entry if wrong hash val */
1829 :
1830 : /*
1831 : * see if the cached list matches our key.
1832 : */
1833 1865702 : if (cl->nkeys != nkeys)
1834 0 : continue;
1835 :
1836 1865702 : if (!CatalogCacheCompareTuple(cache, nkeys, cl->keys, arguments))
1837 0 : continue;
1838 :
1839 : /*
1840 : * We found a matching list. Move the list to the front of the list
1841 : * for its hashbucket, so as to speed subsequent searches. (We do not
1842 : * move the members to the fronts of their hashbucket lists, however,
1843 : * since there's no point in that unless they are searched for
1844 : * individually.)
1845 : */
1846 1865702 : dlist_move_head(lbucket, &cl->cache_elem);
1847 :
1848 : /* Bump the list's refcount and return it */
1849 1865702 : ResourceOwnerEnlarge(CurrentResourceOwner);
1850 1865702 : cl->refcount++;
1851 1865702 : ResourceOwnerRememberCatCacheListRef(CurrentResourceOwner, cl);
1852 :
1853 : CACHE_elog(DEBUG2, "SearchCatCacheList(%s): found list",
1854 : cache->cc_relname);
1855 :
1856 : #ifdef CATCACHE_STATS
1857 : cache->cc_lhits++;
1858 : #endif
1859 :
1860 1865702 : return cl;
1861 : }
1862 :
1863 : /*
1864 : * List was not found in cache, so we have to build it by reading the
1865 : * relation. For each matching tuple found in the relation, use an
1866 : * existing cache entry if possible, else build a new one.
1867 : *
1868 : * We have to bump the member refcounts temporarily to ensure they won't
1869 : * get dropped from the cache while loading other members. We use a PG_TRY
1870 : * block to ensure we can undo those refcounts if we get an error before
1871 : * we finish constructing the CatCList. ctlist must be valid throughout
1872 : * the PG_TRY block.
1873 : */
1874 164587 : ctlist = NIL;
1875 :
1876 : /*
1877 : * Cache invalidation can happen while we're building the list.
1878 : * CatalogCacheCreateEntry() handles concurrent invalidation of individual
1879 : * tuples, but it's also possible that a new entry is concurrently added
1880 : * that should be part of the list we're building. Register an
1881 : * "in-progress" entry that will receive the invalidation, until we have
1882 : * built the final list entry.
1883 : */
1884 164587 : save_in_progress = catcache_in_progress_stack;
1885 164587 : in_progress_ent.next = catcache_in_progress_stack;
1886 164587 : in_progress_ent.cache = cache;
1887 164587 : in_progress_ent.hash_value = lHashValue;
1888 164587 : in_progress_ent.list = true;
1889 164587 : in_progress_ent.dead = false;
1890 164587 : catcache_in_progress_stack = &in_progress_ent;
1891 :
1892 164587 : PG_TRY();
1893 : {
1894 : ScanKeyData cur_skey[CATCACHE_MAXKEYS];
1895 : Relation relation;
1896 : SysScanDesc scandesc;
1897 164587 : bool first_iter = true;
1898 :
1899 164587 : relation = table_open(cache->cc_reloid, AccessShareLock);
1900 :
1901 : /*
1902 : * Ok, need to make a lookup in the relation, copy the scankey and
1903 : * fill out any per-call fields.
1904 : */
1905 164587 : memcpy(cur_skey, cache->cc_skey, sizeof(ScanKeyData) * cache->cc_nkeys);
1906 164587 : cur_skey[0].sk_argument = v1;
1907 164587 : cur_skey[1].sk_argument = v2;
1908 164587 : cur_skey[2].sk_argument = v3;
1909 164587 : cur_skey[3].sk_argument = v4;
1910 :
1911 : /*
1912 : * Scan the table for matching entries. If an invalidation arrives
1913 : * mid-build, we will loop back here to retry.
1914 : */
1915 : do
1916 : {
1917 : /*
1918 : * If we are retrying, release refcounts on any items created on
1919 : * the previous iteration. We dare not try to free them if
1920 : * they're now unreferenced, since an error while doing that would
1921 : * result in the PG_CATCH below doing extra refcount decrements.
1922 : * Besides, we'll likely re-adopt those items in the next
1923 : * iteration, so it's not worth complicating matters to try to get
1924 : * rid of them.
1925 : */
1926 164592 : foreach(ctlist_item, ctlist)
1927 : {
1928 0 : ct = (CatCTup *) lfirst(ctlist_item);
1929 : Assert(ct->c_list == NULL);
1930 : Assert(ct->refcount > 0);
1931 0 : ct->refcount--;
1932 : }
1933 : /* Reset ctlist in preparation for new try */
1934 164592 : ctlist = NIL;
1935 164592 : in_progress_ent.dead = false;
1936 :
1937 329184 : scandesc = systable_beginscan(relation,
1938 : cache->cc_indexoid,
1939 164592 : IndexScanOK(cache),
1940 : NULL,
1941 : nkeys,
1942 : cur_skey);
1943 :
1944 : /* The list will be ordered iff we are doing an index scan */
1945 164592 : ordered = (scandesc->irel != NULL);
1946 :
1947 : /* Injection point to help testing the recursive invalidation case */
1948 164592 : if (first_iter)
1949 : {
1950 164587 : INJECTION_POINT("catcache-list-miss-systable-scan-started", NULL);
1951 164587 : first_iter = false;
1952 : }
1953 :
1954 677174 : while (HeapTupleIsValid(ntp = systable_getnext(scandesc)) &&
1955 512587 : !in_progress_ent.dead)
1956 : {
1957 : uint32 hashValue;
1958 : Index hashIndex;
1959 512582 : bool found = false;
1960 : dlist_head *bucket;
1961 :
1962 : /*
1963 : * See if there's an entry for this tuple already.
1964 : */
1965 512582 : ct = NULL;
1966 512582 : hashValue = CatalogCacheComputeTupleHashValue(cache, cache->cc_nkeys, ntp);
1967 512582 : hashIndex = HASH_INDEX(hashValue, cache->cc_nbuckets);
1968 :
1969 512582 : bucket = &cache->cc_bucket[hashIndex];
1970 708902 : dlist_foreach(iter, bucket)
1971 : {
1972 277054 : ct = dlist_container(CatCTup, cache_elem, iter.cur);
1973 :
1974 277054 : if (ct->dead || ct->negative)
1975 517 : continue; /* ignore dead and negative entries */
1976 :
1977 276537 : if (ct->hash_value != hashValue)
1978 186462 : continue; /* quickly skip entry if wrong hash val */
1979 :
1980 90075 : if (!ItemPointerEquals(&(ct->tuple.t_self), &(ntp->t_self)))
1981 0 : continue; /* not same tuple */
1982 :
1983 : /*
1984 : * Found a match, but can't use it if it belongs to
1985 : * another list already
1986 : */
1987 90075 : if (ct->c_list)
1988 9341 : continue;
1989 :
1990 80734 : found = true;
1991 80734 : break; /* A-OK */
1992 : }
1993 :
1994 512582 : if (!found)
1995 : {
1996 : /* We didn't find a usable entry, so make a new one */
1997 431848 : ct = CatalogCacheCreateEntry(cache, ntp, NULL,
1998 : hashValue, hashIndex);
1999 :
2000 : /* upon failure, we must start the scan over */
2001 431848 : if (ct == NULL)
2002 : {
2003 0 : in_progress_ent.dead = true;
2004 0 : break;
2005 : }
2006 : }
2007 :
2008 : /* Careful here: add entry to ctlist, then bump its refcount */
2009 : /* This way leaves state correct if lappend runs out of memory */
2010 512582 : ctlist = lappend(ctlist, ct);
2011 512582 : ct->refcount++;
2012 : }
2013 :
2014 164592 : systable_endscan(scandesc);
2015 164592 : } while (in_progress_ent.dead);
2016 :
2017 164587 : table_close(relation, AccessShareLock);
2018 :
2019 : /* Make sure the resource owner has room to remember this entry. */
2020 164587 : ResourceOwnerEnlarge(CurrentResourceOwner);
2021 :
2022 : /* Now we can build the CatCList entry. */
2023 164587 : oldcxt = MemoryContextSwitchTo(CacheMemoryContext);
2024 164587 : nmembers = list_length(ctlist);
2025 : cl = (CatCList *)
2026 164587 : palloc(offsetof(CatCList, members) + nmembers * sizeof(CatCTup *));
2027 :
2028 : /* Extract key values */
2029 164587 : CatCacheCopyKeys(cache->cc_tupdesc, nkeys, cache->cc_keyno,
2030 164587 : arguments, cl->keys);
2031 164587 : MemoryContextSwitchTo(oldcxt);
2032 :
2033 : /*
2034 : * We are now past the last thing that could trigger an elog before we
2035 : * have finished building the CatCList and remembering it in the
2036 : * resource owner. So it's OK to fall out of the PG_TRY, and indeed
2037 : * we'd better do so before we start marking the members as belonging
2038 : * to the list.
2039 : */
2040 : }
2041 0 : PG_CATCH();
2042 : {
2043 : Assert(catcache_in_progress_stack == &in_progress_ent);
2044 0 : catcache_in_progress_stack = save_in_progress;
2045 :
2046 0 : foreach(ctlist_item, ctlist)
2047 : {
2048 0 : ct = (CatCTup *) lfirst(ctlist_item);
2049 : Assert(ct->c_list == NULL);
2050 : Assert(ct->refcount > 0);
2051 0 : ct->refcount--;
2052 0 : if (
2053 : #ifndef CATCACHE_FORCE_RELEASE
2054 0 : ct->dead &&
2055 : #endif
2056 0 : ct->refcount == 0 &&
2057 0 : (ct->c_list == NULL || ct->c_list->refcount == 0))
2058 0 : CatCacheRemoveCTup(cache, ct);
2059 : }
2060 :
2061 0 : PG_RE_THROW();
2062 : }
2063 164587 : PG_END_TRY();
2064 : Assert(catcache_in_progress_stack == &in_progress_ent);
2065 164587 : catcache_in_progress_stack = save_in_progress;
2066 :
2067 164587 : cl->cl_magic = CL_MAGIC;
2068 164587 : cl->my_cache = cache;
2069 164587 : cl->refcount = 0; /* for the moment */
2070 164587 : cl->dead = false;
2071 164587 : cl->ordered = ordered;
2072 164587 : cl->nkeys = nkeys;
2073 164587 : cl->hash_value = lHashValue;
2074 164587 : cl->n_members = nmembers;
2075 :
2076 164587 : i = 0;
2077 677169 : foreach(ctlist_item, ctlist)
2078 : {
2079 512582 : cl->members[i++] = ct = (CatCTup *) lfirst(ctlist_item);
2080 : Assert(ct->c_list == NULL);
2081 512582 : ct->c_list = cl;
2082 : /* release the temporary refcount on the member */
2083 : Assert(ct->refcount > 0);
2084 512582 : ct->refcount--;
2085 : /* mark list dead if any members already dead */
2086 512582 : if (ct->dead)
2087 0 : cl->dead = true;
2088 : }
2089 : Assert(i == nmembers);
2090 :
2091 : /*
2092 : * Add the CatCList to the appropriate bucket, and count it.
2093 : */
2094 164587 : dlist_push_head(lbucket, &cl->cache_elem);
2095 :
2096 164587 : cache->cc_nlist++;
2097 :
2098 : /* Finally, bump the list's refcount and return it */
2099 164587 : cl->refcount++;
2100 164587 : ResourceOwnerRememberCatCacheListRef(CurrentResourceOwner, cl);
2101 :
2102 : CACHE_elog(DEBUG2, "SearchCatCacheList(%s): made list of %d members",
2103 : cache->cc_relname, nmembers);
2104 :
2105 164587 : return cl;
2106 : }
2107 :
2108 : /*
2109 : * ReleaseCatCacheList
2110 : *
2111 : * Decrement the reference count of a catcache list.
2112 : */
2113 : void
2114 2030271 : ReleaseCatCacheList(CatCList *list)
2115 : {
2116 2030271 : ReleaseCatCacheListWithOwner(list, CurrentResourceOwner);
2117 2030271 : }
2118 :
2119 : static void
2120 2030289 : ReleaseCatCacheListWithOwner(CatCList *list, ResourceOwner resowner)
2121 : {
2122 : /* Safety checks to ensure we were handed a cache entry */
2123 : Assert(list->cl_magic == CL_MAGIC);
2124 : Assert(list->refcount > 0);
2125 2030289 : list->refcount--;
2126 2030289 : if (resowner)
2127 2030271 : ResourceOwnerForgetCatCacheListRef(resowner, list);
2128 :
2129 2030289 : if (
2130 : #ifndef CATCACHE_FORCE_RELEASE
2131 2030289 : list->dead &&
2132 : #endif
2133 3 : list->refcount == 0)
2134 3 : CatCacheRemoveCList(list->my_cache, list);
2135 2030289 : }
2136 :
2137 :
2138 : /*
2139 : * CatalogCacheCreateEntry
2140 : * Create a new CatCTup entry, copying the given HeapTuple and other
2141 : * supplied data into it. The new entry initially has refcount 0.
2142 : *
2143 : * To create a normal cache entry, ntp must be the HeapTuple just fetched
2144 : * from scandesc, and "arguments" is not used. To create a negative cache
2145 : * entry, pass NULL for ntp; then "arguments" is the cache keys to use.
2146 : * In either case, hashValue/hashIndex are the hash values computed from
2147 : * the cache keys.
2148 : *
2149 : * Returns NULL if we attempt to detoast the tuple and observe that it
2150 : * became stale. (This cannot happen for a negative entry.) Caller must
2151 : * retry the tuple lookup in that case.
2152 : */
2153 : static CatCTup *
2154 3854332 : CatalogCacheCreateEntry(CatCache *cache, HeapTuple ntp, Datum *arguments,
2155 : uint32 hashValue, Index hashIndex)
2156 : {
2157 : CatCTup *ct;
2158 : MemoryContext oldcxt;
2159 :
2160 3854332 : if (ntp)
2161 : {
2162 : int i;
2163 2959514 : HeapTuple dtp = NULL;
2164 :
2165 : /*
2166 : * The invalidation of the in-progress entry essentially never happens
2167 : * during our regression tests, and there's no easy way to force it to
2168 : * fail for testing purposes. To ensure we have test coverage for the
2169 : * retry paths in our callers, make debug builds randomly fail about
2170 : * 0.1% of the times through this code path, even when there's no
2171 : * toasted fields.
2172 : */
2173 : #ifdef USE_ASSERT_CHECKING
2174 : if (pg_prng_uint32(&pg_global_prng_state) <= (PG_UINT32_MAX / 1000))
2175 : return NULL;
2176 : #endif
2177 :
2178 : /*
2179 : * If there are any out-of-line toasted fields in the tuple, expand
2180 : * them in-line. This saves cycles during later use of the catcache
2181 : * entry, and also protects us against the possibility of the toast
2182 : * tuples being freed before we attempt to fetch them, in case of
2183 : * something using a slightly stale catcache entry.
2184 : */
2185 2959514 : if (HeapTupleHasExternal(ntp))
2186 : {
2187 : CatCInProgress *save_in_progress;
2188 : CatCInProgress in_progress_ent;
2189 :
2190 : /*
2191 : * The tuple could become stale while we are doing toast table
2192 : * access (since AcceptInvalidationMessages can run then). The
2193 : * invalidation will mark our in-progress entry as dead.
2194 : */
2195 2171 : save_in_progress = catcache_in_progress_stack;
2196 2171 : in_progress_ent.next = catcache_in_progress_stack;
2197 2171 : in_progress_ent.cache = cache;
2198 2171 : in_progress_ent.hash_value = hashValue;
2199 2171 : in_progress_ent.list = false;
2200 2171 : in_progress_ent.dead = false;
2201 2171 : catcache_in_progress_stack = &in_progress_ent;
2202 :
2203 2171 : PG_TRY();
2204 : {
2205 2171 : dtp = toast_flatten_tuple(ntp, cache->cc_tupdesc);
2206 : }
2207 0 : PG_FINALLY();
2208 : {
2209 : Assert(catcache_in_progress_stack == &in_progress_ent);
2210 2171 : catcache_in_progress_stack = save_in_progress;
2211 : }
2212 2171 : PG_END_TRY();
2213 :
2214 2171 : if (in_progress_ent.dead)
2215 : {
2216 0 : heap_freetuple(dtp);
2217 0 : return NULL;
2218 : }
2219 : }
2220 : else
2221 2957343 : dtp = ntp;
2222 :
2223 : /* Allocate memory for CatCTup and the cached tuple in one go */
2224 2959514 : oldcxt = MemoryContextSwitchTo(CacheMemoryContext);
2225 :
2226 5919028 : ct = (CatCTup *) palloc(sizeof(CatCTup) +
2227 2959514 : MAXIMUM_ALIGNOF + dtp->t_len);
2228 2959514 : ct->tuple.t_len = dtp->t_len;
2229 2959514 : ct->tuple.t_self = dtp->t_self;
2230 2959514 : ct->tuple.t_tableOid = dtp->t_tableOid;
2231 2959514 : ct->tuple.t_data = (HeapTupleHeader)
2232 2959514 : MAXALIGN(((char *) ct) + sizeof(CatCTup));
2233 : /* copy tuple contents */
2234 2959514 : memcpy((char *) ct->tuple.t_data,
2235 2959514 : (const char *) dtp->t_data,
2236 2959514 : dtp->t_len);
2237 2959514 : MemoryContextSwitchTo(oldcxt);
2238 :
2239 2959514 : if (dtp != ntp)
2240 2171 : heap_freetuple(dtp);
2241 :
2242 : /* extract keys - they'll point into the tuple if not by-value */
2243 8496253 : for (i = 0; i < cache->cc_nkeys; i++)
2244 : {
2245 : Datum atp;
2246 : bool isnull;
2247 :
2248 5536739 : atp = heap_getattr(&ct->tuple,
2249 : cache->cc_keyno[i],
2250 : cache->cc_tupdesc,
2251 : &isnull);
2252 : Assert(!isnull);
2253 5536739 : ct->keys[i] = atp;
2254 : }
2255 : }
2256 : else
2257 : {
2258 : /* Set up keys for a negative cache entry */
2259 894818 : oldcxt = MemoryContextSwitchTo(CacheMemoryContext);
2260 894818 : ct = palloc_object(CatCTup);
2261 :
2262 : /*
2263 : * Store keys - they'll point into separately allocated memory if not
2264 : * by-value.
2265 : */
2266 894818 : CatCacheCopyKeys(cache->cc_tupdesc, cache->cc_nkeys, cache->cc_keyno,
2267 894818 : arguments, ct->keys);
2268 894818 : MemoryContextSwitchTo(oldcxt);
2269 : }
2270 :
2271 : /*
2272 : * Finish initializing the CatCTup header, and add it to the cache's
2273 : * linked list and counts.
2274 : */
2275 3854332 : ct->ct_magic = CT_MAGIC;
2276 3854332 : ct->my_cache = cache;
2277 3854332 : ct->c_list = NULL;
2278 3854332 : ct->refcount = 0; /* for the moment */
2279 3854332 : ct->dead = false;
2280 3854332 : ct->negative = (ntp == NULL);
2281 3854332 : ct->hash_value = hashValue;
2282 :
2283 3854332 : dlist_push_head(&cache->cc_bucket[hashIndex], &ct->cache_elem);
2284 :
2285 3854332 : cache->cc_ntup++;
2286 3854332 : CacheHdr->ch_ntup++;
2287 :
2288 : /*
2289 : * If the hash table has become too full, enlarge the buckets array. Quite
2290 : * arbitrarily, we enlarge when fill factor > 2.
2291 : */
2292 3854332 : if (cache->cc_ntup > cache->cc_nbuckets * 2)
2293 3363 : RehashCatCache(cache);
2294 :
2295 3854332 : return ct;
2296 : }
2297 :
2298 : /*
2299 : * Helper routine that frees keys stored in the keys array.
2300 : */
2301 : static void
2302 314379 : CatCacheFreeKeys(TupleDesc tupdesc, int nkeys, const int *attnos, const Datum *keys)
2303 : {
2304 : int i;
2305 :
2306 970170 : for (i = 0; i < nkeys; i++)
2307 : {
2308 655791 : int attnum = attnos[i];
2309 :
2310 : /* system attribute are not supported in caches */
2311 : Assert(attnum > 0);
2312 :
2313 655791 : if (!TupleDescCompactAttr(tupdesc, attnum - 1)->attbyval)
2314 274546 : pfree(DatumGetPointer(keys[i]));
2315 : }
2316 314379 : }
2317 :
2318 : /*
2319 : * Helper routine that copies the keys in the srckeys array into the dstkeys
2320 : * one, guaranteeing that the datums are fully allocated in the current memory
2321 : * context.
2322 : */
2323 : static void
2324 1059405 : CatCacheCopyKeys(TupleDesc tupdesc, int nkeys, const int *attnos,
2325 : const Datum *srckeys, Datum *dstkeys)
2326 : {
2327 : int i;
2328 :
2329 : /*
2330 : * XXX: memory and lookup performance could possibly be improved by
2331 : * storing all keys in one allocation.
2332 : */
2333 :
2334 3315305 : for (i = 0; i < nkeys; i++)
2335 : {
2336 2255900 : int attnum = attnos[i];
2337 2255900 : Form_pg_attribute att = TupleDescAttr(tupdesc, attnum - 1);
2338 2255900 : Datum src = srckeys[i];
2339 : NameData srcname;
2340 :
2341 : /*
2342 : * Must be careful in case the caller passed a C string where a NAME
2343 : * is wanted: convert the given argument to a correctly padded NAME.
2344 : * Otherwise the memcpy() done by datumCopy() could fall off the end
2345 : * of memory.
2346 : */
2347 2255900 : if (att->atttypid == NAMEOID)
2348 : {
2349 455263 : namestrcpy(&srcname, DatumGetCString(src));
2350 455263 : src = NameGetDatum(&srcname);
2351 : }
2352 :
2353 2255900 : dstkeys[i] = datumCopy(src,
2354 2255900 : att->attbyval,
2355 2255900 : att->attlen);
2356 : }
2357 1059405 : }
2358 :
2359 : /*
2360 : * PrepareToInvalidateCacheTuple()
2361 : *
2362 : * This is part of a rather subtle chain of events, so pay attention:
2363 : *
2364 : * When a tuple is inserted or deleted, it cannot be flushed from the
2365 : * catcaches immediately, for reasons explained at the top of cache/inval.c.
2366 : * Instead we have to add entry(s) for the tuple to a list of pending tuple
2367 : * invalidations that will be done at the end of the command or transaction.
2368 : *
2369 : * The lists of tuples that need to be flushed are kept by inval.c. This
2370 : * routine is a helper routine for inval.c. Given a tuple belonging to
2371 : * the specified relation, find all catcaches it could be in, compute the
2372 : * correct hash value for each such catcache, and call the specified
2373 : * function to record the cache id and hash value in inval.c's lists.
2374 : * SysCacheInvalidate will be called later, if appropriate,
2375 : * using the recorded information.
2376 : *
2377 : * For an insert or delete, tuple is the target tuple and newtuple is NULL.
2378 : * For an update, we are called just once, with tuple being the old tuple
2379 : * version and newtuple the new version. We should make two list entries
2380 : * if the tuple's hash value changed, but only one if it didn't.
2381 : *
2382 : * Note that it is irrelevant whether the given tuple is actually loaded
2383 : * into the catcache at the moment. Even if it's not there now, it might
2384 : * be by the end of the command, or there might be a matching negative entry
2385 : * to flush --- or other backends' caches might have such entries --- so
2386 : * we have to make list entries to flush it later.
2387 : *
2388 : * Also note that it's not an error if there are no catcaches for the
2389 : * specified relation. inval.c doesn't know exactly which rels have
2390 : * catcaches --- it will call this routine for any tuple that's in a
2391 : * system relation.
2392 : */
2393 : void
2394 1706515 : PrepareToInvalidateCacheTuple(Relation relation,
2395 : HeapTuple tuple,
2396 : HeapTuple newtuple,
2397 : void (*function) (int, uint32, Oid, void *),
2398 : void *context)
2399 : {
2400 : slist_iter iter;
2401 : Oid reloid;
2402 :
2403 : CACHE_elog(DEBUG2, "PrepareToInvalidateCacheTuple: called");
2404 :
2405 : /*
2406 : * sanity checks
2407 : */
2408 : Assert(RelationIsValid(relation));
2409 : Assert(HeapTupleIsValid(tuple));
2410 : Assert(function);
2411 : Assert(CacheHdr != NULL);
2412 :
2413 1706515 : reloid = RelationGetRelid(relation);
2414 :
2415 : /* ----------------
2416 : * for each cache
2417 : * if the cache contains tuples from the specified relation
2418 : * compute the tuple's hash value(s) in this cache,
2419 : * and call the passed function to register the information.
2420 : * ----------------
2421 : */
2422 :
2423 146760290 : slist_foreach(iter, &CacheHdr->ch_caches)
2424 : {
2425 145053775 : CatCache *ccp = slist_container(CatCache, cc_next, iter.cur);
2426 : uint32 hashvalue;
2427 : Oid dbid;
2428 :
2429 145053775 : if (ccp->cc_reloid != reloid)
2430 141944365 : continue;
2431 :
2432 : /* Just in case cache hasn't finished initialization yet... */
2433 3109410 : ConditionalCatalogCacheInitializeCache(ccp);
2434 :
2435 3109410 : hashvalue = CatalogCacheComputeTupleHashValue(ccp, ccp->cc_nkeys, tuple);
2436 3109410 : dbid = ccp->cc_relisshared ? (Oid) 0 : MyDatabaseId;
2437 :
2438 3109410 : (*function) (ccp->id, hashvalue, dbid, context);
2439 :
2440 3109410 : if (newtuple)
2441 : {
2442 : uint32 newhashvalue;
2443 :
2444 228724 : newhashvalue = CatalogCacheComputeTupleHashValue(ccp, ccp->cc_nkeys, newtuple);
2445 :
2446 228724 : if (newhashvalue != hashvalue)
2447 3251 : (*function) (ccp->id, newhashvalue, dbid, context);
2448 : }
2449 : }
2450 1706515 : }
2451 :
2452 : /* ResourceOwner callbacks */
2453 :
2454 : static void
2455 5755 : ResOwnerReleaseCatCache(Datum res)
2456 : {
2457 5755 : ReleaseCatCacheWithOwner((HeapTuple) DatumGetPointer(res), NULL);
2458 5755 : }
2459 :
2460 : static char *
2461 0 : ResOwnerPrintCatCache(Datum res)
2462 : {
2463 0 : HeapTuple tuple = (HeapTuple) DatumGetPointer(res);
2464 0 : CatCTup *ct = (CatCTup *) (((char *) tuple) -
2465 : offsetof(CatCTup, tuple));
2466 :
2467 : /* Safety check to ensure we were handed a cache entry */
2468 : Assert(ct->ct_magic == CT_MAGIC);
2469 :
2470 0 : return psprintf("cache %s (%d), tuple %u/%u has count %d",
2471 0 : ct->my_cache->cc_relname, ct->my_cache->id,
2472 0 : ItemPointerGetBlockNumber(&(tuple->t_self)),
2473 0 : ItemPointerGetOffsetNumber(&(tuple->t_self)),
2474 : ct->refcount);
2475 : }
2476 :
2477 : static void
2478 18 : ResOwnerReleaseCatCacheList(Datum res)
2479 : {
2480 18 : ReleaseCatCacheListWithOwner((CatCList *) DatumGetPointer(res), NULL);
2481 18 : }
2482 :
2483 : static char *
2484 0 : ResOwnerPrintCatCacheList(Datum res)
2485 : {
2486 0 : CatCList *list = (CatCList *) DatumGetPointer(res);
2487 :
2488 0 : return psprintf("cache %s (%d), list %p has count %d",
2489 0 : list->my_cache->cc_relname, list->my_cache->id,
2490 : list, list->refcount);
2491 : }
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