Function RelationCacheInitialize

src/backend/utils/cache/relcache.c:4084–4117

#define INITRELCACHESIZE		400

void
RelationCacheInitialize(void)
{
	HASHCTL		ctl;
	int			allocsize;

	/*
	 * make sure cache memory context exists
	 */
	if (!CacheMemoryContext)
		CreateCacheMemoryContext();

	/*
	 * create hashtable that indexes the relcache
	 */
	ctl.keysize = sizeof(Oid);
	ctl.entrysize = sizeof(RelIdCacheEnt);
	RelationIdCache = hash_create("Relcache by OID", INITRELCACHESIZE,
								  &ctl, HASH_ELEM | HASH_BLOBS);

	/*
	 * reserve enough in_progress_list slots for many cases
	 */
	allocsize = 4;
	in_progress_list =
		MemoryContextAlloc(CacheMemoryContext,
						   allocsize * sizeof(*in_progress_list));
	in_progress_list_maxlen = allocsize;

	/*
	 * relation mapper needs to be initialized too
	 */
	RelationMapInitialize();
}

/*
 *		RelationCacheInitializePhase2