March 2003
Intermediate to advanced
282 pages
9h 13m
English
book
IMS in the Parallel Sysplex Volume I: Reviewing the IMSplex Technology
by Jouko Jantti, Juan Jesœs Iniesta Mart’nez, Knut Kubein, Bill Stillwell, Gary Wicks
Content preview from IMS in the Parallel Sysplex Volume I: Reviewing the IMSplex Technology
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Chapter 5. IMS shared queues 111
5.4.1 Registering interest in PSBs for Fast Path
When the first IFP region for a PSB is started in an IMS, IMS registers interest in the PSB to
CQS. When an EMH message is put on the program queue for the PSB and causes the
queue to go from empty to non-empty, CQS notifies every IMS that has previously registered
interest in the PSB that there is a message on the queue.
If the IMS system has an available IFP region to execute the transaction, IMS tells CQS to get
the message from the shared queues. Since there could be many IMS systems in the shared
queues group, the
first CQS
to request the message receives the message from the shared
queues. In shared queue environments, the same program names can exist in ...
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