1SCHED_SETPARAM(2)          Linux Programmer's Manual         SCHED_SETPARAM(2)
2
3
4

NAME

6       sched_setparam, sched_getparam - set and get scheduling parameters
7

SYNOPSIS

9       #include <sched.h>
10
11       int sched_setparam(pid_t pid, const struct sched_param *param);
12
13       int sched_getparam(pid_t pid, struct sched_param *param);
14
15       struct sched_param {
16           ...
17           int sched_priority;
18           ...
19       };
20

DESCRIPTION

22       sched_setparam()  sets  the  scheduling  parameters associated with the
23       scheduling policy for the process identified by pid. If  pid  is  zero,
24       then  the parameters of the current process are set. The interpretation
25       of the parameter param depends on the scheduling policy of the  process
26       identified  by pid.  See sched_setscheduler(2) for a description of the
27       scheduling policies supported under Linux.
28
29       sched_getparam() retrieves the scheduling parameters  for  the  process
30       identified  by  pid. If pid is zero, then the parameters of the current
31       process are retrieved.
32
33       sched_setparam() checks the validity of param for the scheduling policy
34       of the process. The parameter param->sched_priority must lie within the
35       range given by sched_get_priority_min(2) and sched_get_priority_max(2).
36
37       For a discussion of the  privileges  and  resource  limits  related  to
38       scheduling priority and policy, see sched_setscheduler(2).
39
40       POSIX systems on which sched_setparam() and sched_getparam() are avail‐
41       able define _POSIX_PRIORITY_SCHEDULING in <unistd.h>.
42

RETURN VALUE

44       On success, sched_setparam() and sched_getparam() return 0.  On  error,
45       -1 is returned, and errno is set appropriately.
46

ERRORS

48       EINVAL The parameter param does not make sense for the current schedul‐
49              ing policy.
50
51       EPERM  The calling process does not have appropriate privileges (Linux:
52              does not have the CAP_SYS_NICE capability).
53
54       ESRCH  The process whose ID is pid could not be found.
55

CONFORMING TO

57       POSIX.1-2001.
58

SEE ALSO

60       getpriority(2),  nice(2),  sched_get_priority_max(2),  sched_get_prior‐
61       ity_min(2),        sched_getaffinity(2),         sched_getscheduler(2),
62       sched_setaffinity(2),  sched_setscheduler(2), setpriority(2), capabili‐
63       ties(7)
64
65       Programming for the real  world  -  POSIX.4  by  Bill  O.  Gallmeister,
66       O'Reilly & Associates, Inc., ISBN 1-56592-074-0
67
68
69
70Linux 2.6.16                      2006-03-23                 SCHED_SETPARAM(2)
Impressum