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CICS FREE (LUTYPE6.1) - LU6.1 Resource Deallocation

CICS FREE (LUTYPE6.1) provides LU6.1 resource deallocation capabilities for programs and transactions. It enables programs to free LU6.1 resources, manage LU6.1 resource cleanup, and handle LU6.1 resource deallocation in CICS environments.

What is CICS FREE (LUTYPE6.1)?

CICS FREE (LUTYPE6.1) is a command that allows programs to deallocate LU6.1 resources in the system. It provides LU6.1 resource deallocation capabilities, LU6.1 resource cleanup, and LU6.1 resource management for CICS applications.

Command Syntax

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EXEC CICS FREE
    LUTYPE6.1
    [RESP(response-code)]
END-EXEC

Parameters

Required Parameters

  • LUTYPE6.1 - LU6.1 resource type

Optional Parameters

  • RESP(response-code) - Response code variable

LU6.1 Resource Types

LU6.1 Sessions

LU6.1 session resource types

  • • LU6.1 SESSION - LU6.1 session resources
  • • LU6.1 CONVERSATION - LU6.1 conversation resources
  • • LU6.1 CONNECTION - LU6.1 connection resources
  • • LU6.1 CHANNEL - LU6.1 channel resources

LU6.1 Resources

LU6.1 resource types

  • • LU6.1 MEMORY - LU6.1 memory resources
  • • LU6.1 BUFFER - LU6.1 buffer resources
  • • LU6.1 QUEUE - LU6.1 queue resources
  • • LU6.1 EVENT - LU6.1 event resources

LU6.1 Communication

LU6.1 communication resource types

  • • LU6.1 MESSAGE - LU6.1 message resources
  • • LU6.1 DATA - LU6.1 data resources
  • • LU6.1 CONTROL - LU6.1 control resources
  • • LU6.1 STATUS - LU6.1 status resources

LU6.1 System

LU6.1 system resource types

  • • LU6.1 PROCESS - LU6.1 process resources
  • • LU6.1 THREAD - LU6.1 thread resources
  • • LU6.1 LOCK - LU6.1 lock resources
  • • LU6.1 HANDLE - LU6.1 handle resources

Programming Examples

Basic LU6.1 Resource Deallocation

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       IDENTIFICATION DIVISION.
       PROGRAM-ID. FREE61.
       DATA DIVISION.
       WORKING-STORAGE SECTION.
       01  RESPONSE-CODE PIC S9(8) COMP.
       
       PROCEDURE DIVISION.
           DISPLAY 'Freeing LU6.1 resource'
           
           EXEC CICS FREE
               LUTYPE6.1
               RESP(RESPONSE-CODE)
           END-EXEC
           
           IF RESPONSE-CODE = DFHRESP(NORMAL)
               DISPLAY 'LU6.1 resource freed successfully'
           ELSE
               DISPLAY 'LU6.1 resource free failed'
           END-IF
           
           EXEC CICS RETURN END-EXEC.

Advanced LU6.1 Resource Management

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       IDENTIFICATION DIVISION.
       PROGRAM-ID. FREE62.
       DATA DIVISION.
       WORKING-STORAGE SECTION.
       01  RESPONSE-CODE PIC S9(8) COMP.
       01  FREE-COUNT PIC S9(2) COMP VALUE 0.
       01  MAX-FREES PIC S9(2) COMP VALUE 3.
       01  LU61-STATUS PIC X(1).
       01  LU61-RESOURCE-TYPE PIC X(8).
       
       PROCEDURE DIVISION.
           PERFORM INITIALIZE-LU61-RESOURCES
           PERFORM FREE-LU61-RESOURCES
           
           EXEC CICS RETURN END-EXEC.
       
       INITIALIZE-LU61-RESOURCES.
           MOVE 'SESSION' TO LU61-RESOURCE-TYPE.
       
       FREE-LU61-RESOURCES.
           PERFORM VARYING FREE-COUNT FROM 1 BY 1
               UNTIL FREE-COUNT > MAX-FREES
               
               PERFORM FREE-LU61-SINGLE-RESOURCE
               
               IF RESPONSE-CODE = DFHRESP(NORMAL)
                   MOVE 'F' TO LU61-STATUS
                   DISPLAY 'LU6.1 resource ' FREE-COUNT ' freed successfully'
               ELSE
                   MOVE 'E' TO LU61-STATUS
                   DISPLAY 'LU6.1 resource ' FREE-COUNT ' free failed'
               END-IF
           END-PERFORM.
       
       FREE-LU61-SINGLE-RESOURCE.
           EXEC CICS FREE
               LUTYPE6.1
               RESP(RESPONSE-CODE)
           END-EXEC.

Error Handling with LU6.1 Resource Deallocation

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       IDENTIFICATION DIVISION.
       PROGRAM-ID. FREE63.
       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  LU61-FREE-SUCCESSFUL PIC X(1) VALUE 'N'.
       
       PROCEDURE DIVISION.
           PERFORM FREE-LU61-RESOURCE-WITH-RETRY
           
           EXEC CICS RETURN END-EXEC.
       
       FREE-LU61-RESOURCE-WITH-RETRY.
           PERFORM FREE-LU61-RESOURCE
           
           IF RESPONSE-CODE NOT = DFHRESP(NORMAL)
               AND RETRY-COUNT < MAX-RETRIES
               ADD 1 TO RETRY-COUNT
               DISPLAY 'Retry ' RETRY-COUNT ' LU6.1 resource free operation'
               PERFORM FREE-LU61-RESOURCE-WITH-RETRY
           END-IF.
       
       FREE-LU61-RESOURCE.
           EXEC CICS FREE
               LUTYPE6.1
               RESP(RESPONSE-CODE)
           END-EXEC
           
           EVALUATE RESPONSE-CODE
               WHEN DFHRESP(NORMAL)
                   MOVE 'Y' TO LU61-FREE-SUCCESSFUL
                   DISPLAY 'LU6.1 resource free operation successful'
               WHEN DFHRESP(NOTAUTH)
                   DISPLAY 'Not authorized to free LU6.1 resource'
               WHEN DFHRESP(INVREQ)
                   DISPLAY 'Invalid LU6.1 resource free request'
               WHEN DFHRESP(RESOURCEERR)
                   DISPLAY 'LU6.1 resource free operation error'
               WHEN DFHRESP(RESOURCENOTFOUND)
                   DISPLAY 'LU6.1 resource not found'
               WHEN DFHRESP(RESOURCEINUSE)
                   DISPLAY 'LU6.1 resource is in use'
               WHEN OTHER
                   DISPLAY 'Unexpected LU6.1 resource free error'
           END-EVALUATE.

LU6.1 Resource Management

LU6.1 Resource Deallocation

  • • LU6.1 Resource Free - Free allocated LU6.1 resources
  • • LU6.1 Resource Cleanup - Clean up LU6.1 resource state
  • • LU6.1 Resource Validation - Validate LU6.1 resource state
  • • LU6.1 Resource Monitoring - Monitor LU6.1 resource status

LU6.1 Resource Lifecycle

  • • LU6.1 Resource Allocation - Allocate LU6.1 resources
  • • LU6.1 Resource Usage - Use allocated LU6.1 resources
  • • LU6.1 Resource Deallocation - Deallocate LU6.1 resources
  • • LU6.1 Resource Cleanup - Clean up LU6.1 resources

LU6.1 Resource Monitoring

  • • LU6.1 Resource Tracking - Track LU6.1 resource usage
  • • LU6.1 Resource Auditing - Audit LU6.1 resource operations
  • • LU6.1 Resource Reporting - Report LU6.1 resource status
  • • LU6.1 Resource Analysis - Analyze LU6.1 resource patterns

LU6.1 Error Recovery

  • • LU6.1 Error Detection - Detect LU6.1 resource errors
  • • LU6.1 Error Recovery - Recover from LU6.1 resource errors
  • • LU6.1 Retry Mechanisms - Implement LU6.1 retry logic
  • • LU6.1 Fallback Procedures - Use LU6.1 fallback procedures

Error Handling

Common Response Codes

  • DFHRESP(NORMAL) - LU6.1 resource free operation successful
  • DFHRESP(NOTAUTH) - Not authorized to free LU6.1 resource
  • DFHRESP(INVREQ) - Invalid LU6.1 resource free request
  • DFHRESP(RESOURCEERR) - LU6.1 resource free operation error
  • DFHRESP(RESOURCENOTFOUND) - LU6.1 resource not found
  • DFHRESP(RESOURCEINUSE) - LU6.1 resource is in use

Performance Considerations

LU6.1 Resource Efficiency

  • • Optimize LU6.1 resource operations - Use efficient LU6.1 resource handling
  • • Minimize LU6.1 resource overhead - Reduce LU6.1 resource processing overhead
  • • Use LU6.1 resource pooling - Implement LU6.1 resource pooling
  • • Monitor LU6.1 resource frequency - Track LU6.1 resource free patterns

System Impact

  • • Monitor system impact - Track how LU6.1 resource free affects the system
  • • Optimize LU6.1 resource handling - Ensure efficient LU6.1 resource processing
  • • Manage LU6.1 resource usage - Monitor LU6.1 resource consumption
  • • Track performance metrics - Monitor LU6.1 resource handling performance

Best Practices

LU6.1 Resource Deallocation Best Practices

  • • Free LU6.1 resources as soon as they are no longer needed
  • • Implement proper error handling for LU6.1 resource operations
  • • Validate LU6.1 resource state before freeing
  • • Use appropriate LU6.1 resource management techniques
  • • Monitor LU6.1 resource deallocation activities and performance
  • • Maintain LU6.1 resource deallocation audit trails
  • • Handle LU6.1 resource deallocation errors gracefully

Explain It Like I'm 5 Years Old

Think of CICS FREE (LUTYPE6.1) like putting away your special toys:

  • • Finished Playing: "You finished playing with your special toys" - LU6.1 resource no longer needed
  • • Put Away: "Put your special toys away" - Free LU6.1 resource
  • • Clean Up: "Clean up your special toy area" - LU6.1 resource cleanup
  • • Room Clean: "Your special toy area is clean now" - LU6.1 resource freed
  • • Keep Clean: "Keep your special toy area clean" - LU6.1 resource management

Exercises

Exercise 1: Basic LU6.1 Resource Deallocation

Create a program that frees a basic LU6.1 resource.

Exercise 2: Advanced LU6.1 Resource Management

Write a program that manages multiple LU6.1 resource deallocations.

Exercise 3: Error Handling

Implement comprehensive error handling for LU6.1 resource deallocation failures.

Related Concepts

LU6.1 Resource Management

Managing LU6.1 system resources

LU6.1 Resource Deallocation

Deallocating LU6.1 resources

LU6.1 Resource Monitoring

Monitoring LU6.1 resource usage

LU6.1 Resource Cleanup

Cleaning up LU6.1 resources

Error Handling

Managing LU6.1 resource errors