\" $NetBSD: pthread_schedparam.3,v 1.8 2017/07/03 21:32:51 wiz Exp $
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\" $FreeBSD: src/lib/libpthread/man/pthread_schedparam.3,v 1.7 2002/09/16 19:29:29 mini Exp $
Dd July 9, 2010
Dt PTHREAD_SCHEDPARAM 3
Os
Sh NAME
Nm pthread_setschedparam ,
Nm pthread_getschedparam
Nd thread scheduling parameter manipulation
Sh LIBRARY
Lb libpthread
Sh SYNOPSIS
In pthread.h
Ft int
Fn pthread_setschedparam "pthread_t thread" "int policy" "const struct sched_param *param"
Ft int
Fn pthread_getschedparam "pthread_t thread" "int * restrict policy" "struct sched_param * restrict param"
Sh DESCRIPTION
The
Fn pthread_setschedparam
and
Fn pthread_getschedparam
functions set and get the scheduling parameters of individual threads.
The scheduling policy for a thread can be:
Bl -tag -width SCHED_OTHER -offset indent
It Dv SCHED_FIFO
First in, first out.
It Dv SCHED_RR
Round-robin.
It Dv SCHED_OTHER
The system default.
El
Pp
The thread priority (accessed via
Va param->sched_priority )
must be at least
Dv PTHREAD_MIN_PRIORITY
and no more than
Dv PTHREAD_MAX_PRIORITY .
Sh RETURN VALUES
If successful, these functions return 0.
Otherwise, an error number is returned to indicate the error.
Sh ERRORS
Fn pthread_setschedparam
may fail if:
Bl -tag -width Er
It Bq Er EINVAL
The value specified by
Va policy
is invalid.
It Bq Er ENOTSUP
Invalid value for scheduling parameters.
It Bq Er ESRCH
Non-existent thread
Va thread .
El
Pp
Fn pthread_getschedparam
may fail if:
Bl -tag -width Er
It Bq Er ESRCH
Non-existent thread
Va thread .
El
Sh SEE ALSO
Xr pthread_attr_getschedparam 3 ,
Xr sched 3
Sh STANDARDS
Both functions conform to
St -p1003.1-2001 .

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