You can use the <mix number> BR system command to determine whether a task is eligible for an operator checkpoint and whether the task is currently being checkpointed or restarted. The response has the following form:

TASK <mix number> <checkpoint status>

The following are possible responses if the task is not currently being checkpointed or restarted. The phrase “CANNOT CONTINUE AFTER BR” indicates that the BRCLASS task attribute has a value of ONCEONLY. When BRCLASS = ONCEONLY, the system automatically discontinues the process after the checkpoint completes. However, the process can continue if the operator cancels the checkpoint with an OF (Optional File) system command, as discussed under Operator Actions after the Checkpoint later in this section.

TASK <mix number> IS NOT CHECKPOINTABLE BY THE OPERATOR
TASK <mix number> IS CHECKPOINTABLE
TASK <mix number> IS CHECKPOINTABLE (CANNOT CONTINUE AFTER BR)

The following are responses that indicate that a checkpoint has been requested or is underway:

TASK <mix number> CHECKPOINT REQUESTED
TASK <mix number> CHECKPOINT REQUESTED (CANNOT CONTINUE AFTER BR)
TASK <mix number> CHECKPOINT RUNNING
TASK <mix number> CHECKPOINT RUNNING (CANNOT CONTINUE AFTER BR)

The following responses indicate that a restart is underway. In these responses, the phrase “PROGRAM” means that the checkpoint was initiated by a CHECKPOINT statement in the task. The phrases “ONCEONLY” and “MULTIPLE” specify the value of the BRCLASS task attribute in cases where the checkpoint was operator initiated.

TASK <mix number>: RESTARTING
TASK <mix number>: RESTARTING (PROGRAM)
TASK <mix number>: RESTARTING (ONCEONLY)
TASK <mix number>: RESTARTING (MULTIPLE)

The Y (Status Interrogate) system command displays more limited information about the checkpoint status of a task. If a checkpoint or restart action has been requested for a task, a line of the following form appears in the Y display:

CHECKPOINT STATUS: <status>

The possible <status> values are REQUESTED, RUNNING, or RESTARTING. These values have the same meaning they do in the BR display.