1sched_setparam(2)             System Calls Manual            sched_setparam(2)
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NAME

6       sched_setparam, sched_getparam - set and get scheduling parameters
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LIBRARY

9       Standard C library (libc, -lc)
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SYNOPSIS

12       #include <sched.h>
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14       int sched_setparam(pid_t pid, const struct sched_param *param);
15       int sched_getparam(pid_t pid, struct sched_param *param);
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17       struct sched_param {
18           ...
19           int sched_priority;
20           ...
21       };
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DESCRIPTION

24       sched_setparam()  sets  the  scheduling  parameters associated with the
25       scheduling policy for the thread whose thread ID is specified  in  pid.
26       If pid is zero, then the parameters of the calling thread are set.  The
27       interpretation of the argument param depends on the  scheduling  policy
28       of the thread identified by pid.  See sched(7) for a description of the
29       scheduling policies supported under Linux.
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31       sched_getparam() retrieves the scheduling  parameters  for  the  thread
32       identified  by pid.  If pid is zero, then the parameters of the calling
33       thread are retrieved.
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35       sched_setparam() checks the validity of param for the scheduling policy
36       of  the  thread.   The  value param->sched_priority must lie within the
37       range given by sched_get_priority_min(2) and sched_get_priority_max(2).
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39       For a discussion of the  privileges  and  resource  limits  related  to
40       scheduling priority and policy, see sched(7).
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42       POSIX systems on which sched_setparam() and sched_getparam() are avail‐
43       able define _POSIX_PRIORITY_SCHEDULING in <unistd.h>.
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RETURN VALUE

46       On success, sched_setparam() and sched_getparam() return 0.  On  error,
47       -1 is returned, and errno is set to indicate the error.
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ERRORS

50       EINVAL Invalid arguments: param is NULL or pid is negative
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52       EINVAL (sched_setparam())  The  argument  param does not make sense for
53              the current scheduling policy.
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55       EPERM  (sched_setparam()) The caller does not have  appropriate  privi‐
56              leges (Linux: does not have the CAP_SYS_NICE capability).
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58       ESRCH  The thread whose ID is pid could not be found.
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STANDARDS

61       POSIX.1-2008.
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HISTORY

64       POSIX.1-2001.
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SEE ALSO

67       getpriority(2), gettid(2), nice(2), sched_get_priority_max(2),
68       sched_get_priority_min(2), sched_getaffinity(2), sched_getscheduler(2),
69       sched_setaffinity(2), sched_setattr(2), sched_setscheduler(2),
70       setpriority(2), capabilities(7), sched(7)
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74Linux man-pages 6.05              2023-03-30                 sched_setparam(2)
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