sched_setparam, sched_getparam — set and get scheduling parameters
#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;
...
};
sched_setparam() sets the
scheduling parameters associated with the scheduling policy
for the process identified by pid. If pid is zero, then the
parameters of the calling process are set. The interpretation
of the argument param
depends on the scheduling policy of the process identified by
pid. See sched(7) for a description
of the scheduling policies supported under Linux.
sched_getparam() retrieves
the scheduling parameters for the process identified by
pid. If pid is zero, then the
parameters of the calling process 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>
On success, sched_setparam()
and sched_getparam() return 0.
On error, −1 is returned, and errno is set appropriately.
Invalid arguments: param is NULL or
pid is
negative
(sched_setparam()) The
argument param
does not make sense for the current scheduling
policy.
(sched_setparam()) The
calling process does not have appropriate privileges
(Linux: does not have the CAP_SYS_NICE capability).
The process whose ID is pid could not be
found.
getpriority(2), nice(2), sched_get_priority_max(2), sched_get_priority_min(2), sched_getaffinity(2), sched_getscheduler(2), sched_setaffinity(2), sched_setscheduler(2), sched_setattr(2), setpriority(2), capabilities(7), sched(7)
This page is part of release 4.07 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'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> |