1 .\" Copyright (C) Tom Bjorkholm & Markus Kuhn, 1996
3 .\" %%%LICENSE_START(GPLv2+_DOC_FULL)
4 .\" This is free documentation; you can redistribute it and/or
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24 .\" 1996-04-01 Tom Bjorkholm <tomb@mydata.se>
25 .\" First version written
26 .\" 1996-04-10 Markus Kuhn <mskuhn@cip.informatik.uni-erlangen.de>
28 .\" Modified 2004-05-27 by Michael Kerrisk <mtk.manpages@gmail.com>
30 .TH SCHED_SETPARAM 2 2021-03-22 "Linux" "Linux Programmer's Manual"
32 sched_setparam, sched_getparam \- set and get scheduling parameters
37 .BI "int sched_setparam(pid_t " pid ", const struct sched_param *" param );
38 .BI "int sched_getparam(pid_t " pid ", struct sched_param *" param );
40 \fBstruct sched_param {
42 int \fIsched_priority\fB;
48 sets the scheduling parameters associated with the scheduling policy
49 for the thread whose thread ID is specified in \fIpid\fP.
50 If \fIpid\fP is zero, then
51 the parameters of the calling thread are set.
53 the argument \fIparam\fP depends on the scheduling
54 policy of the thread identified by
58 for a description of the scheduling policies supported under Linux.
61 retrieves the scheduling parameters for the
62 thread identified by \fIpid\fP.
63 If \fIpid\fP is zero, then the parameters
64 of the calling thread are retrieved.
67 checks the validity of \fIparam\fP for the scheduling policy of the
69 The value \fIparam\->sched_priority\fP must lie within the
71 .BR sched_get_priority_min (2)
73 .BR sched_get_priority_max (2).
75 For a discussion of the privileges and resource limits related to
76 scheduling priority and policy, see
79 POSIX systems on which
84 .B _POSIX_PRIORITY_SCHEDULING
92 On error, \-1 is returned, and
94 is set to indicate the error.
105 .RB ( sched_setparam ())
106 The argument \fIparam\fP does not make sense for the current
110 .RB ( sched_setparam ())
111 The caller does not have appropriate privileges
112 (Linux: does not have the
117 The thread whose ID is \fIpid\fP could not be found.
119 POSIX.1-2001, POSIX.1-2008.
126 .BR sched_get_priority_max (2),
127 .BR sched_get_priority_min (2),
128 .BR sched_getaffinity (2),
129 .BR sched_getscheduler (2),
130 .BR sched_setaffinity (2),
131 .BR sched_setattr (2),
132 .BR sched_setscheduler (2),
134 .BR capabilities (7),