MMT_PRIOR/SMS.SPJB - Set a Job's Priority
Set a job’s priority.
|Call Parameters||Return Register||Return Parameter|
|D1.L||Id of the job to be prioritised.||D1.L||Preserved unless on entry it was -1 in which case it will become the Id of the current job.|
|D2.B||Job’s new priority. See notes below.||D2.L||Preserved.|
|A0.L||Unused.||A0.L||Base address of prioritised job.|
|ERR_NJ||Invalid job id.|
- All registers not shown above are not used on entry and are preserved on exit.
- The priority passed in D2.B is documented as being in the range 0 to 127, however, it appears that values from 0 to 255 can be used.
- This trap always exits via the job scheduler, so it is not atomic.
The following shows the use of this call.
moveq #mt_prior,d0 ; Or MT+PRIOR. moveq #-1,d1 ; Change my own priority. moveq #1,d2 ; Set priority very low. trap #1 ; Change the priority.