If your program has PH capability, it can call the GETPRIORITY intrinsic to
change its priority class or the priority class of a child process. A process
is scheduled on the basis of a particular priority class when it is created.
Generally, MPE/iX schedules processes in linear or circular subqueues:
AS subqueue, a linear subqueue containing system processes only
BS subqueue, a linear subqueue containing processes of very high
priority
CS subqueue, a circular subqueue recommended for interactive processes
DS subqueue, a circular subqueue available for general use at a lower
priority than the CS subqueue and recommended for batch jobs
ES subqueue, a circular subqueue operating at a very low priority
(background)
The following is an example of a GETPRIORITY intrinsic call:
GETPRIORITY (PIN,PRIORITYCLASS);
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The parameters specified in the above example are described below.
- PIN
Passes the Process Identification Number of the process whose priority
class is to change. For example, a value of zero indicates the calling process.
- PRIORITYCLASS
Passes a value indicating the priority class in which the
specified process is rescheduled. For example, the value 17,235 indicates that
the process is rescheduled in the CS priority class.
