A description for this Performance-schema Table has not yet been added to this Documentation.
CREATE TABLE `rwlock_instances` ( `NAME` varchar(128) NOT NULL COMMENT 'Instrument name associated with the read write lock', `OBJECT_INSTANCE_BEGIN` bigint(20) unsigned NOT NULL COMMENT 'Address in memory of the instrumented lock', `WRITE_LOCKED_BY_THREAD_ID` bigint(20) unsigned DEFAULT NULL COMMENT 'THREAD_ID of the locking thread if locked in write (exclusive) mode, otherwise NULL.', `READ_LOCKED_BY_COUNT` int(10) unsigned NOT NULL COMMENT 'Count of current read locks held' )
Additional information on this topic may be found in the MariaDB Public Knowledge Base.
Information specific to MariaDB SkySQL can be found on the rwlock_instances page in the SkySQL Documentation.