What is CICS ISSUE HALT command used for?

CICS ISSUE HALT is used to signal halt operations in the system, providing halt signaling capabilities and halt state management for CICS applications.

What types of halt operations can be signaled?

Halt types include system halt (system, region, application, transaction halt), process halt (process, task, thread, job halt), resource halt (resource, file, database, network halt), and emergency halt (emergency, immediate, forced, graceful halt).

How do I handle errors with CICS ISSUE HALT?

Always check the response code and implement appropriate error handling, including validation of halt state, retry mechanisms for failed operations, and fallback procedures for halt signaling errors.

What is the purpose of halt signaling?

Halt signaling enables halt signal, halt state management, halt validation, halt monitoring, halt lifecycle management, halt monitoring, and halt error recovery in CICS applications.

When should I use CICS ISSUE HALT?

Use this command when you need to signal halt operations, manage halt state, process halt operations, or implement halt signaling in CICS applications.

CICS ISSUE HALT - Halt Signal

CICS ISSUE HALT provides halt signaling capabilities for programs and transactions. It enables programs to signal halt operations, manage halt states, and handle halt processing in CICS environments.

What is CICS ISSUE HALT?

CICS ISSUE HALT is a command that allows programs to signal halt operations in the system. It provides halt signaling capabilities, halt state management, and halt processing for CICS applications.

Command Syntax

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EXEC CICS ISSUE HALT
    [RESPONSE(response-code)]
END-EXEC

Parameters

Optional Parameters

RESPONSE(response-code) - Response code variable

Halt Types

System Halt

System halt types

• SYSTEM HALT - System halt
• REGION HALT - Region halt
• APPLICATION HALT - Application halt
• TRANSACTION HALT - Transaction halt

Process Halt

Process halt types

• PROCESS HALT - Process halt
• TASK HALT - Task halt
• THREAD HALT - Thread halt
• JOB HALT - Job halt

Resource Halt

Resource halt types

• RESOURCE HALT - Resource halt
• FILE HALT - File halt
• DATABASE HALT - Database halt
• NETWORK HALT - Network halt

Emergency Halt

Emergency halt types

• EMERGENCY HALT - Emergency halt
• IMMEDIATE HALT - Immediate halt
• FORCED HALT - Forced halt
• GRACEFUL HALT - Graceful halt

Programming Examples

Basic Halt Signaling

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       IDENTIFICATION DIVISION.
       PROGRAM-ID. ISSUEHALT01.
       DATA DIVISION.
       WORKING-STORAGE SECTION.
       01  RESPONSE-CODE PIC S9(8) COMP.
       01  HALT-REASON PIC X(20) VALUE 'SYSTEM MAINTENANCE'.
       
       PROCEDURE DIVISION.
           DISPLAY 'Signaling halt operation'
           DISPLAY 'Halt reason: ' HALT-REASON
           
           EXEC CICS ISSUE HALT
               RESPONSE(RESPONSE-CODE)
           END-EXEC
           
           IF RESPONSE-CODE = DFHRESP(NORMAL)
               DISPLAY 'Halt operation signaled successfully'
           ELSE
               DISPLAY 'Halt operation signal failed'
           END-IF
           
           EXEC CICS RETURN END-EXEC.

Advanced Halt Management

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       IDENTIFICATION DIVISION.
       PROGRAM-ID. ISSUEHALT02.
       DATA DIVISION.
       WORKING-STORAGE SECTION.
       01  RESPONSE-CODE PIC S9(8) COMP.
       01  HALT-COUNT PIC S9(2) COMP VALUE 0.
       01  MAX-HALTS PIC S9(2) COMP VALUE 3.
       01  HALT-STATUS PIC X(1).
       01  HALT-LIST.
           05  HALT-ITEM OCCURS 3 TIMES.
               10  HALT-ID PIC X(8).
               10  HALT-TYPE PIC X(8).
               10  HALT-STATUS PIC X(1).
       
       PROCEDURE DIVISION.
           PERFORM INITIALIZE-HALTS
           PERFORM SIGNAL-MULTIPLE-HALTS
           
           EXEC CICS RETURN END-EXEC.
       
       INITIALIZE-HALTS.
           MOVE 'HALT001' TO HALT-ID(1)
           MOVE 'SYSTEM' TO HALT-TYPE(1)
           MOVE 'HALT002' TO HALT-ID(2)
           MOVE 'REGION' TO HALT-TYPE(2)
           MOVE 'HALT003' TO HALT-ID(3)
           MOVE 'APPLICATION' TO HALT-TYPE(3).
       
       SIGNAL-MULTIPLE-HALTS.
           PERFORM VARYING HALT-COUNT FROM 1 BY 1
               UNTIL HALT-COUNT > MAX-HALTS
               
               PERFORM SIGNAL-SINGLE-HALT
               
               IF RESPONSE-CODE = DFHRESP(NORMAL)
                   MOVE 'S' TO HALT-STATUS(HALT-COUNT)
                   DISPLAY 'Halt ' HALT-COUNT ' signaled successfully'
               ELSE
                   MOVE 'F' TO HALT-STATUS(HALT-COUNT)
                   DISPLAY 'Halt ' HALT-COUNT ' signal failed'
               END-IF
           END-PERFORM.
       
       SIGNAL-SINGLE-HALT.
           EXEC CICS ISSUE HALT
               RESPONSE(RESPONSE-CODE)
           END-EXEC.

Error Handling with Halt Signaling

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       IDENTIFICATION DIVISION.
       PROGRAM-ID. ISSUEHALT03.
       DATA DIVISION.
       WORKING-STORAGE SECTION.
       01  RESPONSE-CODE PIC S9(8) COMP.
       01  RETRY-COUNT PIC S9(2) COMP VALUE 0.
       01  MAX-RETRIES PIC S9(2) COMP VALUE 3.
       01  HALT-SIGNAL-SUCCESSFUL PIC X(1) VALUE 'N'.
       
       PROCEDURE DIVISION.
           PERFORM SIGNAL-HALT-WITH-RETRY
           
           EXEC CICS RETURN END-EXEC.
       
       SIGNAL-HALT-WITH-RETRY.
           PERFORM SIGNAL-HALT
           
           IF RESPONSE-CODE NOT = DFHRESP(NORMAL)
               AND RETRY-COUNT < MAX-RETRIES
               ADD 1 TO RETRY-COUNT
               DISPLAY 'Retry ' RETRY-COUNT ' halt signal operation'
               PERFORM SIGNAL-HALT-WITH-RETRY
           END-IF.
       
       SIGNAL-HALT.
           EXEC CICS ISSUE HALT
               RESPONSE(RESPONSE-CODE)
           END-EXEC
           
           EVALUATE RESPONSE-CODE
               WHEN DFHRESP(NORMAL)
                   MOVE 'Y' TO HALT-SIGNAL-SUCCESSFUL
                   DISPLAY 'Halt signal operation successful'
               WHEN DFHRESP(NOTAUTH)
                   DISPLAY 'Not authorized to signal halt'
               WHEN DFHRESP(INVREQ)
                   DISPLAY 'Invalid halt signal request'
               WHEN DFHRESP(HALTERR)
                   DISPLAY 'Halt signal error'
               WHEN DFHRESP(HALTNOTFOUND)
                   DISPLAY 'Halt not found'
               WHEN DFHRESP(HALTINUSE)
                   DISPLAY 'Halt is in use'
               WHEN OTHER
                   DISPLAY 'Unexpected halt signal error'
           END-EVALUATE.

Halt Management

Halt Operations

• Halt Signal - Signal halt operation
• Halt State - Manage halt state
• Halt Validation - Validate halt
• Halt Monitoring - Monitor halt status

Halt Lifecycle

• Halt Creation - Create halt
• Halt Processing - Process halt
• Halt Completion - Complete halt
• Halt Cleanup - Clean up halt

Halt Monitoring

• Halt Tracking - Track halt usage
• Halt Auditing - Audit halt operations
• Halt Reporting - Report halt status
• Halt Analysis - Analyze halt patterns

Halt Error Recovery

• Halt Error Detection - Detect halt errors
• Halt Error Recovery - Recover from halt errors
• Halt Retry Mechanisms - Implement halt retry logic
• Halt Fallback Procedures - Use halt fallback procedures

Error Handling

Common Response Codes

DFHRESP(NORMAL) - Halt signal operation successful
DFHRESP(NOTAUTH) - Not authorized to signal halt
DFHRESP(INVREQ) - Invalid halt signal request
DFHRESP(HALTERR) - Halt signal error
DFHRESP(HALTNOTFOUND) - Halt not found
DFHRESP(HALTINUSE) - Halt is in use

Performance Considerations

Halt Efficiency

• Optimize halt operations - Use efficient halt handling
• Minimize halt overhead - Reduce halt processing overhead
• Use halt pooling - Implement halt pooling
• Monitor halt frequency - Track halt signal patterns

System Impact

• Monitor system impact - Track how halt signal affects the system
• Optimize halt handling - Ensure efficient halt processing
• Manage halt usage - Monitor halt consumption
• Track performance metrics - Monitor halt handling performance

Best Practices

Halt Signaling Best Practices

• Signal halt only when halt operation is needed
• Implement proper error handling for halt operations
• Validate halt state before signaling
• Use appropriate halt management techniques
• Monitor halt signaling activities and performance
• Maintain halt signaling audit trails
• Handle halt signaling errors gracefully

Explain It Like I'm 5 Years Old

Think of CICS ISSUE HALT like stopping a car:

• Driving Car: "You are driving a car" - System running
• Stop Sign: "You see a stop sign" - Halt signal
• Stop Car: "Stop the car" - Halt operation
• Park Car: "Park the car" - Halt completion
• Done: "You are done driving" - Halt finished

Exercises

Exercise 1: Basic Halt Signaling

Create a program that signals basic halt operations.

Exercise 2: Advanced Halt Management

Write a program that manages multiple halt signaling.

Exercise 3: Error Handling

Implement comprehensive error handling for halt signaling failures.

CICS ISSUE HALT - Halt Signal

What is CICS ISSUE HALT?

Command Syntax

Parameters

Optional Parameters

Halt Types

System Halt

Process Halt

Resource Halt

Emergency Halt

Programming Examples

Basic Halt Signaling

Advanced Halt Management

Error Handling with Halt Signaling

Halt Management

Halt Operations

Halt Lifecycle

Halt Monitoring

Halt Error Recovery

Error Handling

Common Response Codes

Performance Considerations

Halt Efficiency

System Impact

Best Practices

Halt Signaling Best Practices

Explain It Like I'm 5 Years Old

Exercises

Exercise 1: Basic Halt Signaling

Exercise 2: Advanced Halt Management

Exercise 3: Error Handling

Related Concepts

Halt Management

Halt Operations

Halt Processing

Halt Monitoring

Error Handling

Related Pages