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CICS WAIT JOURNALNAME - Journal Name Waiting

Purpose: The CICS WAIT JOURNALNAME command suspends the current task until a specific journal name is available.

Command Syntax

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EXEC CICS WAIT JOURNALNAME
    JOURNALNAME(journal-name)
    [RESP(response-code)]
END-EXEC

Parameters

  • JOURNALNAME(journal-name) - Name of the journal to wait for
  • RESP(response-code) - Optional response code field for error handling

Journal Types

  • User Journals: Journals created by user programs
  • System Journals: Journals created by CICS system
  • Custom Journals: Application-specific journals
  • Named Journals: Journals with specific names

Programming Example

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WORKING-STORAGE SECTION.
01  JOURNAL-NAME         PIC X(8) VALUE 'MYJOURNAL'.
01  RESPONSE-CODE        PIC S9(8) COMP.
 
PROCEDURE DIVISION.
    DISPLAY 'Waiting for journal: ' JOURNAL-NAME
    
    *> Wait for the journal to be available
    EXEC CICS WAIT JOURNALNAME
        JOURNALNAME(JOURNAL-NAME)
        RESP(RESPONSE-CODE)
    END-EXEC.
    
    IF RESPONSE-CODE = DFHRESP(NORMAL)
        DISPLAY 'Journal available successfully'
        DISPLAY 'Continuing with processing...'
        
        *> Process the journal
        PERFORM PROCESS-JOURNAL
    ELSE
        IF RESPONSE-CODE = DFHRESP(TIMEOUT)
            DISPLAY 'Timeout waiting for journal'
        ELSE
            DISPLAY 'Error waiting for journal: ' RESPONSE-CODE
        END-IF
    END-IF.
    
    *> Example with journal writing
    EXEC CICS WRITE JOURNALNAME
        JOURNALNAME(JOURNAL-NAME)
        FROM(JOURNAL-DATA)
        LENGTH(JOURNAL-LENGTH)
        RESP(RESPONSE-CODE)
    END-EXEC.
    
    IF RESPONSE-CODE = DFHRESP(NORMAL)
        DISPLAY 'Journal written successfully'
    END-IF.
 
PROCESS-JOURNAL.
    DISPLAY 'Processing journal: ' JOURNAL-NAME
    *> Add journal processing logic here
    EXIT.

Error Handling

  • DFHRESP(NORMAL) - Journal available successfully
  • DFHRESP(TIMEOUT) - Timeout waiting for journal
  • DFHRESP(INVREQ) - Invalid request or parameter
  • DFHRESP(NOTAUTH) - Not authorized to wait for journal

Performance Considerations

  • WAIT JOURNALNAME suspends the task, freeing CPU resources
  • Use appropriate timeout values to avoid indefinite waits
  • Consider the impact on transaction throughput
  • Use journals for coordination between tasks

Best Practices

  • Always check the response code for error handling
  • Use meaningful journal names for easier management
  • Consider using timeout values for critical operations
  • Coordinate journal writing with journal waiting
  • Document journal usage in your programs

Explain It Like I'm 5 Years Old

Imagine you're waiting for a special notebook to be available so you can write in it. The CICS WAIT JOURNALNAME command is like waiting for that notebook to be free. When someone else finishes using it and makes it available, you can start writing in it. It's like having a special way to wait for a notebook to be ready before you can use it!

Exercises

  1. Write a program that waits for a journal and then processes it
  2. Create a routine that writes to a journal for another task to wait for
  3. Implement error handling for the WAIT JOURNALNAME command
  4. Write code that coordinates between multiple tasks using journals

Related Concepts

Journal Management

Managing journals in CICS

WRITE JOURNALNAME

Writing to journals

Task Coordination

Coordinating tasks

Synchronization

Synchronizing tasks

Error Handling

Handling journal errors