Function init_ts_config_cache

src/backend/utils/cache/ts_cache.c:361–379

* Initialize config cache and prepare callbacks. This is split out of * lookup_ts_config_cache because we need to activate the callback before * caching TSCurrentConfigCache, too. */

 * caching TSCurrentConfigCache, too.
 */
static void
init_ts_config_cache(void)
{
	HASHCTL		ctl;

	ctl.keysize = sizeof(Oid);
	ctl.entrysize = sizeof(TSConfigCacheEntry);
	TSConfigCacheHash = hash_create("Tsearch configuration cache", 16,
									&ctl, HASH_ELEM | HASH_BLOBS);
	/* Flush cache on pg_ts_config and pg_ts_config_map changes */
	CacheRegisterSyscacheCallback(TSCONFIGOID, InvalidateTSCacheCallBack,
								  PointerGetDatum(TSConfigCacheHash));
	CacheRegisterSyscacheCallback(TSCONFIGMAP, InvalidateTSCacheCallBack,
								  PointerGetDatum(TSConfigCacheHash));

	/* Also make sure CacheMemoryContext exists */
	if (!CacheMemoryContext)
		CreateCacheMemoryContext();
}

/*
 * Fetch configuration cache entry