The following code changes the CPU priority based on the
input which, who, and priority type values.
The which value used is PRIO_PROCESS, indicating
that the priority will be set by process ID. The who
value used is 7, to set the priority for process ID 7.
The priority type is CPRIO_ABSOLUTE, indicating that
the priority will be set to the value specified, 1.
For the callable service,
see
chpriority (BPX1CHP, BPX4CHP) — Change the scheduling priority of a process. AMODE 31
callers use
BPX1CHP (chpriority) example.
MVC PROCID,=XL4'00000007' Process ID to change priority for
MVC PRIORITY,=XL4'00000001' Priority value of 1
SPACE ,
CALL BPX4CHP, Change priority value +
(=A(PRIO_PROCESS), Input: Set by Process ID +
PROCID, Input: PID to set priority for +
=A(CPRIO_ABSOLUTE), Input: Change by absolute value +
PRIORITY, Input: Priority value to change to+
RETVAL, Return value: 0 or -1 +
RETCODE, Return code +
RSNCODE), Reason code +
MF=(E,PLIST) ----------------------------------
L R15,RETVAL Load return value
C R15,=F'-1' Test for -1 return
BE PSEUDO Branch on error