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Status Needs more information
Workspace z/TPF Product Family
Categories z/TPF
Created by Guest
Created on Dec 2, 2025

RELATED IDEAS

Add Timeout Argument to Find, Wait and Hold Macro/Functions (assembler & C)

Applications/Utilities/Processes need a way to provide the max amount of time it is willing to wait to access a data record. If the timeout value for the "W"ait has been reached, then the process can make a determination what should happen in the event it cannot access the requested file address. Through the years, we've encountered so many issues of building record hold queues and still encounter them today. The FIWHC timeout argument would help tremendously to alleviate RHT queue build-up and less manual intervention from real-time coverage to exit ECBs when the system has the potential to become unstable.

This should also be applicable/usable by remote file accesses via the zTPFDF mongoDB interface.

Idea priority High
  • Guest
    Dec 9, 2025
    Are you aware of the Record Hold Table (RHT) wait queue threshold exceeded (UCCWQTX) user exit? This is a user exit in the control program that can be used to limit the number of ECBs on a record hold table queue. If UCCWQTX is active, a FIWHC will call UCCWQTX if the number of items on the RHT queue is greater than or equal to the RHT wait queue value. (The RHT wait queue value can be managed using ZSONS DISPLAY WQT and ZSONS ALTER WQT).

    You can add logic in UCCWQTX to direct TPF's handling of the FIWHC request. Directions are:
    (a) Add the request to the queue.
    (b) Do not add the request to the queue and give an error return to the application.
    (c) Do not add the request to the queue and exit the ECB.

    The intention of the user exit is to prevent RHT queues from being too large which we believe is the intention of this idea. The implementation is slightly different, but the end result is the same.

    Is there a need for this idea or can the UCCWQTX user exit be used instead?
    Reply

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