Section (2) sched_setparam
Name
sched_setparam, sched_getparam — set and get scheduling parameters
Synopsis
#include <sched.h>
int
sched_setparam( |
pid_t pid, |
const struct sched_param *param); |
int
sched_getparam( |
pid_t pid, |
struct sched_param *param); |
struct sched_param {
...
int sched_priority;
...
};
DESCRIPTION
sched_setparam() sets the
scheduling parameters associated with the scheduling policy
for the thread whose thread ID is specified in pid. If pid is zero, then the
parameters of the calling thread are set. The interpretation
of the argument param
depends on the scheduling policy of the thread identified by
pid. See sched(7) for a description
of the scheduling policies supported under Linux.
sched_getparam() retrieves
the scheduling parameters for the thread identified by
pid. If pid is zero, then the
parameters of the calling thread are retrieved.
sched_setparam() checks the
validity of param for
the scheduling policy of the thread. The value param−>sched_priority
must lie within the range given by sched_get_priority_min(2)
and sched_get_priority_max(2).
For a discussion of the privileges and resource limits related to scheduling priority and policy, see sched(7).
POSIX systems on which sched_setparam() and sched_getparam() are available define
_POSIX_PRIORITY_SCHEDULING in
<unistd.h>
RETURN VALUE
On success, sched_setparam()
and sched_getparam() return 0.
On error, −1 is returned, and errno is set appropriately.
ERRORS
- EINVAL
-
Invalid arguments:
paramis NULL orpidis negative - EINVAL
-
(
sched_setparam()) The argumentparamdoes not make sense for the current scheduling policy. - EPERM
-
(
sched_setparam()) The caller does not have appropriate privileges (Linux: does not have theCAP_SYS_NICEcapability). - ESRCH
-
The thread whose ID is
pidcould not be found.
SEE ALSO
getpriority(2), gettid(2), nice(2), sched_get_priority_max(2), sched_get_priority_min(2), sched_getaffinity(2), sched_getscheduler(2), sched_setaffinity(2), sched_setattr(2), sched_setscheduler(2), setpriority(2), capabilities(7), sched(7)
COLOPHON
This page is part of release 5.04 of the Linux man-pages project. A
description of the project, information about reporting bugs,
and the latest version of this page, can be found at
https://www.kernel.org/doc/man−pages/.
|
Copyright (C) Tom Bjorkholm & Markus Kuhn, 1996 %%%LICENSE_START(GPLv2+_DOC_FULL) This is free documentation; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version. The GNU General Public License_zsingle_quotesz_s references to object code and executables are to be interpreted as the output of any document formatting or typesetting system, including intermediate and printed output. This manual is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this manual; if not, see <http://www.gnu.org/licenses/>. %%%LICENSE_END 1996-04-01 Tom Bjorkholm <tombmydata.se> First version written 1996-04-10 Markus Kuhn <mskuhncip.informatik.uni-erlangen.de> revision Modified 2004-05-27 by Michael Kerrisk <mtk.manpagesgmail.com> |