Definitions

BMIB: Root control block for PDSE member and directory pages.
DIB: A control block that is used by PDSE processing to represent a data set. It is the root from which all OPEN DCB information is stored.
DIRECTORY LOCK: A lock that is used to serialize the updates to the name and attribute directories of the PDSE. When this lock is held, it is impossible to perform any PDSE functions.
FORMATWRITE LOCK: A lock that is used to serialize the operations that are associated with extending a PDSE and formatting space within the PDSE. When the system holds this lock, it cannot open the PDSE or perform new-member create functions on it, unless it is already open on the same system.
HASH TABLE: A structure that can be used to allow for the lookup of various PDSE control blocks, including DIBs and HL1Bs.
HL1B: A control block that is used by PDSE processing to represent the serialization for the PDSE.
LATCH: A serialization object that PDSE processing uses to maintain the integrity of its control block structures. These latches are not GRS latches. Other than the V SMS,PDSE|PDSE1commands, there are no mechanisms that allow you to directly determine or modify the status of the PDSE latches.
LOCK: The internal mechanism that is used to serialize access to the PDSE internal structures.
LSD and LADE: Internal PDSE control block which represent the pages which make up the directory or members of a PDSE.
XCM: The subcomponent of PDSE processing that is responsible for communicating between systems using the XCF facilities.