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_setscheduler(2) 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 process. 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_setscheduler(2).
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.
The argument param does not make sense
for the current scheduling policy.
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), setpriority(2), capabilities(7)
Programming for the real world − POSIX.4 by Bill O. Gallmeister, O'Reilly & Associates, Inc., ISBN 1-56592-074-0
This page is part of release 3.33 of the Linux man-pages project. A
description of the project, and information about reporting
bugs, can be found at http://man7.org/linux/man-pages/.
|
Copyright (C) Tom Bjorkholm & Markus Kuhn, 1996 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, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111, USA. 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> |