1SCHED_SETPARAM(2)          Linux Programmer's Manual         SCHED_SETPARAM(2)
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NAME

6       sched_setparam, sched_getparam - set and get scheduling parameters
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SYNOPSIS

9       #include <sched.h>
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11       int sched_setparam(pid_t pid, const struct sched_param *param);
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13       int sched_getparam(pid_t pid, struct sched_param *param);
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15       struct sched_param {
16           ...
17           int sched_priority;
18           ...
19       };
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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 calling process are set.  The interpretation
25       of the argument param depends on the scheduling policy of  the  process
26       identified  by  pid.   See sched(7) for a description of the scheduling
27       policies supported under Linux.
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29       sched_getparam() retrieves the scheduling parameters  for  the  process
30       identified  by pid.  If pid is zero, then the parameters of the calling
31       process are retrieved.
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33       sched_setparam() checks the validity of param for the scheduling policy
34       of  the  thread.   The  value param->sched_priority must lie within the
35       range given by sched_get_priority_min(2) and sched_get_priority_max(2).
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37       For a discussion of the  privileges  and  resource  limits  related  to
38       scheduling priority and policy, see sched(7).
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40       POSIX systems on which sched_setparam() and sched_getparam() are avail‐
41       able define _POSIX_PRIORITY_SCHEDULING in <unistd.h>.
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RETURN VALUE

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

48       EINVAL Invalid arguments: param is NULL or pid is negative
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50       EINVAL (sched_setparam())  The  argument  param does not make sense for
51              the current scheduling policy.
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53       EPERM  (sched_setparam()) The calling process does not have appropriate
54              privileges (Linux: does not have the CAP_SYS_NICE capability).
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56       ESRCH  The process whose ID is pid could not be found.
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CONFORMING TO

59       POSIX.1-2001, POSIX.1-2008.
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NOTES

62       Scheduling  parameters  are in fact per-thread attributes on Linux; see
63       sched(7).
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SEE ALSO

66       getpriority(2), nice(2), sched_get_priority_max(2),
67       sched_get_priority_min(2), sched_getaffinity(2), sched_getscheduler(2),
68       sched_setaffinity(2), sched_setattr(2), sched_setscheduler(2),
69       setpriority(2), capabilities(7), sched(7)
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COLOPHON

72       This page is part of release 4.15 of the Linux man-pages project.  A
73       description of the project, information about reporting bugs, and the
74       latest version of this page, can be found at
75       https://www.kernel.org/doc/man-pages/.
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79Linux                             2017-09-15                 SCHED_SETPARAM(2)
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