Title: Process Priorities
|Product: LispWorks, LispWorks for Linux, LispWorks for Windows|
Each process has a priority and can either be runnable, blocked or suspended.
If there is a runnable process with priority P, then no processes with priority less than P will run.
When there are runnable processes with equal priority, they will be scheduled in a round-robin manner.
If a process with priority P is running and a blocked process with priority greater than P becomes runnable, the second process will run when the scheduler is next invoked (either explicity or at the next preemption tick).
In order to change a process priority various internal data structures need to be updated. The best way to do this is to call MP:CHANGE-PROCESS-PRIORITY
(mp:change-process-priority proc-1 10)
An alternative way is to create the process with the desired priority by passing the :PRIORITY keyword to MP:PROCESS-RUN-FUNCTION.
(list (mp:process-run-function "SORTER-DOT" '(:priority 10) #'sorter #\.)
(mp:process-run-function "SORTER-DASH" () #'sorter #\-))
|See Also: |
|Summary:How does the process scheduler work?|