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Each of the processing threads have 3 different status flags defined in the }APQ C3 Thread Control cube. The main thread uses the status flags for threads monitoring and to detect time when all of the child threads have finished their processing.

Scheduled status is used to signal initialization phase of the process threads.
Running status is set when the threads confirmed they are ready to run - that includes initialization as well.
Completed status is set when threads have finished data processing.

The thread status transitions are summarised in below table.

Status Change Originator Process Stage	Main Thread	Child Thread
Main thread prolog Before spawning child threads	`Scheduled=0` `Running=0` `Completed=0`	`Scheduled=0` `Running=0` `Completed=0`
Main thread prolog When spawning child threads	`Scheduled=1` `Running=1` `Completed=0`	`Scheduled=1` `Running=0` `Completed=0`
Child thread prolog After checking params		`Scheduled=1` `Running=1` `Completed=0`
Child thread prolog Last statement of prolog		`Scheduled=0` `Running=1` `Completed=0`
Main thread epilog Before polling child threads	`Scheduled=0` `Running=0` `Completed=1`
Child thread epilog Before formulating message		`Scheduled=0` `Running=0` `Completed=1`

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