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.TH PTHREAD_ATTR_SETSCHEDPOLICY 3 2008-11-07 "Linux" "Linux Programmer's Manual"
.SH NAME
pthread_attr_setschedpolicy, pthread_attr_getschedpolicy \- set/get
scheduling policy attribute in thread attributes object
.SH SYNOPSIS
.nf
.B #include <pthread.h>

.BI "int pthread_attr_setschedpolicy(pthread_attr_t *" attr \
", int " policy );
.BI "int pthread_attr_getschedpolicy(pthread_attr_t *" attr \
", int " *policy );
.sp
Compile and link with \fI\-pthread\fP.
.SH DESCRIPTION
The
.BR pthread_attr_setschedpolicy ()
function sets the scheduling policy attribute of the
thread attributes object referred to by
.IR thread
to the value specified in
.IR policy .
This attribute determines the scheduling policy of
a thread created using the thread attributes object
.IR attr .

The supported values for
.I policy
are
.BR SCHED_FIFO ,
.BR SCHED_RR ,
and
.BR SCHED_OTHER ,
with the semantics described in
.BR sched_setscheduler (2).
.\" FIXME . pthread_setschedparam() places no restriction on the policy,
.\" but pthread_attr_setschedpolicy() restricts policy to RR/FIFO/OTHER
.\" http://sourceware.org/bugzilla/show_bug.cgi?id=7013

The
.BR pthread_attr_getschedpolicy ()
returns the scheduling policy attribute of the thread attributes object
.IR attr
in the buffer pointed to by
.IR policy .
.SH RETURN VALUE
On success, these functions return 0;
on error, they return a non-zero error number.
.SH ERRORS
.BR pthread_attr_setschedpolicy ()
can fail with the following error:
.TP
.B EINVAL
Invalid value in
.IR policy .
.PP
POSIX.1-2001 also documents an optional
.B ENOTSUP
error ("attempt was made to set the attribute to an unsupported value") for
.BR pthread_attr_setschedpolicy ().
.\" .SH VERSIONS
.\" Available since glibc 2.0.
.SH CONFORMING TO
POSIX.1-2001.
.SH EXAMPLE
See
.BR pthread_setschedparam (3).
.SH SEE ALSO
.BR sched_setscheduler (2),
.BR pthread_attr_init (3),
.BR pthread_attr_setinheritsched (3),
.BR pthread_attr_setschedparam (3),
.BR pthread_create (3),
.BR pthread_setschedparam (3),
.BR pthread_setschedprio (3),
.BR pthreads (7)
.SH COLOPHON
This page is part of release 3.22 of the Linux
.I man-pages
project.
A description of the project,
and information about reporting bugs,
can be found at
http://www.kernel.org/doc/man-pages/.
