GETPRIORITY(2) | System Calls Manual | GETPRIORITY(2) |
int
getpriority(int which, id_t who);
int
setpriority(int which, id_t who, int prio);
The priority is maintained in a per-process basis and affects scheduling of LWPs which belong to the process and use the SCHED_OTHER scheduling class.
which is one of PRIO_PROCESS, PRIO_PGRP, or PRIO_USER, and who is interpreted relative to which (a process identifier for PRIO_PROCESS, process group identifier for PRIO_PGRP, and a user ID for PRIO_USER). A zero value of who denotes the current process, process group, or user. prio is a value in the range -20 to 20. The default priority is 0; numerically lower priority values cause more favorable scheduling. A value of 19 or 20 will schedule a process only when nothing at priority ≤ 0 is runnable.
The getpriority() call returns the highest priority (lowest numerical value) enjoyed by any of the specified processes. The setpriority() call sets the priorities of all of the specified processes to the specified value. Only the super-user may lower priority values.
In addition to the errors indicated above, setpriority() will fail if:
April 13, 2012 | NetBSD 7.2 |