Function scanDatabaseForReadyLists

app/redis-6.2.6/src/db.c:1308–1317

Helper function for dbSwapDatabases(): scans the list of keys that have * one or more blocked clients for B[LR]POP or other blocking commands * and signal the keys as ready if they are of the right type. See the comment * where the function is used for more info. */

 * and signal the keys as ready if they are of the right type. See the comment
 * where the function is used for more info. */
void scanDatabaseForReadyLists(redisDb *db) {
    dictEntry *de;
    dictIterator *di = dictGetSafeIterator(db->blocking_keys);
    while((de = dictNext(di)) != NULL) {
        robj *key = dictGetKey(de);
        robj *value = lookupKey(db,key,LOOKUP_NOTOUCH);
        if (value) signalKeyAsReady(db, key, value->type);
    }
    dictReleaseIterator(di);
}

/* Swap two databases at runtime so that all clients will magically see
 * the new database even if already connected. Note that the client