sched_setparam(2) [debian man page]

SCHED_SETPARAM(2)					     Linux Programmer's Manual						 SCHED_SETPARAM(2)

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 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>.

RETURN VALUE

       On success, sched_setparam() and sched_getparam() return 0.  On error, -1 is returned, and errno is set appropriately.

ERRORS

       EINVAL The argument param does not make sense for the current scheduling policy.

       EPERM  The calling process does not have appropriate privileges (Linux: does not have the CAP_SYS_NICE capability).

       ESRCH  The process whose ID is pid could not be found.

CONFORMING TO

       POSIX.1-2001.

SEE ALSO

       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.

COLOPHON

       This page is part of release 3.44 of the Linux man-pages project.  A description of the project, and information about reporting bugs, can
       be found at http://www.kernel.org/doc/man-pages/.

Linux								    2006-03-23							 SCHED_SETPARAM(2)

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SCHED_SETPARAM(2)					     Linux Programmer's Manual						 SCHED_SETPARAM(2)

NAME

       sched_setparam, sched_getparam - set and get scheduling parameters

SYNOPSIS

       #include <sched.h>

       int sched_setparam(pid_t pid, const struct sched_param *p);

       int sched_getparam(pid_t pid, struct sched_param *p);

       struct sched_param {
	   ...
	   int sched_priority;
	   ...
       };

DESCRIPTION

       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 current process are set. The interpretation of the parameter p depends on the selected policy. Currently, the follow-
       ing three scheduling policies are supported under Linux: SCHED_FIFO, SCHED_RR, and SCHED_OTHER.

       sched_getparam  retrieves  the  scheduling parameters for the process identified by pid. If pid is zero, then the parameters of the current
       process are retrieved.

       sched_setparam checks the validity of p for the scheduling policy of the process. The parameter p->sched_priority must lie within the range
       given by sched_get_priority_min and sched_get_priority_max.

       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, errno is set appropriately.

ERRORS

       ESRCH  The process whose ID is pid could not be found.

       EPERM  The  calling  process  does  not have appropriate privileges. The process calling sched_setparam needs an effective uid equal to the
	      euid or uid of the process identified by pid, or it must be a superuser process.

       EINVAL The parameter p does not make sense for the current scheduling policy.

CONFORMING TO

       POSIX.1b (formerly POSIX.4)

SEE ALSO

       sched_setscheduler(2), sched_getscheduler(2),  sched_get_priority_max(2),  sched_get_priority_min(2),  nice(2),	setpriority(2),  getprior-
       ity(2),

       sched_setscheduler(2) has a description of the Linux scheduling scheme.

       Programming for the real world - POSIX.4 by Bill O. Gallmeister, O'Reilly & Associates, Inc., ISBN 1-56592-074-0
       IEEE Std 1003.1b-1993 (POSIX.1b standard)
       ISO/IEC 9945-1:1996

Linux 1.3.81							    1996-04-10							 SCHED_SETPARAM(2)

Linux and UNIX Man Pages

sched_setparam(2) [debian man page]

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