As soon as the checkpoint has been taken successfully and the checkpoint file is entered into the directory, the checkpoint function waits for an operator action. The following is an example of the W (Waiting Mix Entries) system commands display for such a process:
-Job-Task-Pri-Elapsed--- 5 WAITING ENTRIES ---------------------
6927\6928 50 1:44 (JASMITH) (JASMITH)OBJECT/ALGOL/CP ON SYSPK
OPERATOR CHECKPOINT #6927/000 TAKEN @ 112F:00EA:1 @ (00000500)You can determine the possible responses to this waiting state by entering a <mix number> Y command. The REPLY line of the Y command display lists one or more of the following possible responses:
-
<mix number> DS
This command immediately discontinues the checkpointed task and its job. Any user protection, such as EPILOG procedures, will not be considered during the DS operation. This restriction ensures that neither the job nor the task will change the state of any of its files after the checkpoint has been taken. This response is always available after an operator-initiated checkpoint.
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<mix number> OF
This command cancels the checkpoint, removes the files created by the checkpoint, and causes the checkpointed task and its job to continue their normal execution. This response can be used if you decide that the checkpoint was not needed.
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<mix number> OK
This command causes the system to complete the checkpoint, and causes the checkpointed task and its job to continue execution normally after the checkpoint. Any files created by the checkpoint are saved. This response is allowed only if the BRCLASS task attribute value was MULTIPLE.
Additionally, if the task was checkpointed in preparation for a halt/load, the ??PHL (Programmatic Halt Load) system command can be used to initiate the halt/load. After the halt/load, you can enter a command to restart the task.
