MSGQ

Derivation: MeSsaGe Queue

MSGQ specifies the number of instance specific information (ISI) blocks that Language Environment allocates on a per thread basis for use by the application. The ISI block contains information for Language Environment to use when identifying and reacting to conditions, providing access to q_data tokens, and assigning space for message inserts used with user-created messages. When an insufficient number of ISI blocks are available, Language Environment uses the least recently used ISI block.

The default value for non-CICS applications is MSGQ(15).

MSGQ is ignored under CICS®.


Syntax

>>-MSGQ--(--+--------+--)--------------------------------------><
            '-number-'

number: An integer that specifies the number of ISI blocks to maintain on a per thread basis.

Usage notes

PL/I MTF consideration—In a PL/I MTF application, MSGQ sets the number of message queues allowed for each task.
The CEECMI callable service allocates storage for ISI blocks if necessary. For information about using the CEECMI callable service, see CEECMI—Store and load message insert data.

For more information

For more information about the ISI blocks, see z/OS Language Environment Programming Guide.