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SCHED_SETPARAM
!!!SCHED_SETPARAM
NAME
SYNOPSIS
DESCRIPTION
RETURN VALUE
ERRORS
CONFORMING TO
SEE ALSO
----
!!NAME


sched_setparam, sched_getparam - set and get scheduling parameters
!!SYNOPSIS


__#include __


__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 following 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-'' 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
''
!!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), getpriority(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
''
IEEE Std 1003.1b-1993'' (POSIX.1b standard)''
ISO/IEC 9945-1:1996''
----

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Last edited on Tuesday, June 4, 2002 12:23:45 am by "perry"

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