2010-07-08 22:15:27 +04:00
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.\" $NetBSD: pthread_attr_getinheritsched.3,v 1.2 2010/07/08 18:15:27 wiz Exp $
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2010-07-07 19:30:32 +04:00
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.\"
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.\" Copyright (c) 2010 Jukka Ruohonen <jruohonen@iki.fi>
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.\" All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\"
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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.\" ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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.\" TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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.\" PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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.\" BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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.\" CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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.\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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.\" POSSIBILITY OF SUCH DAMAGE.
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.\"
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.Dd July 7, 2010
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.Dt PTHREAD_ATTR_GETINHERITEDSCHED 3
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.Os
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.Sh NAME
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.Nm pthread_attr_getinheritedsched
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.Nd get and set
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.Dq inheritsched
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attribute
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.Sh LIBRARY
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.Lb libpthread
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.Sh SYNOPSIS
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.In pthread.h
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.Ft int
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.Fn pthread_attr_getinheritsched \
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"const pthread_attr_t * restrict attr" "int * restrict inheritsched"
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.Ft int
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.Fn pthread_attr_setinheritsched "pthread_attr_t *attr" "int inheritsched"
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.Sh DESCRIPTION
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The
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.Fn pthread_attr_getinheritsched
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and
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.Fn pthread_attr_setinheritsched
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functions get and set, respectively, the inherit scheduler attribute,
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.Fa inheritsched ,
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in the
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.Fa attr
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object.
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The
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.Fa inheritsched
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parameter specifies whether a tread created by using
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.Fa attr
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will obtain its scheduling attributes directly from
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.Fa attr
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or whether it will inherit these from the calling thread.
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.Pp
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Two values are possible for
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.Fa inheritsched :
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.Bl -tag -width PTHREAD_EXPLICIT_SCHED -offset indent
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.It Dv PTHREAD_INHERIT_SCHED
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The thread scheduling attributes will be
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inherited from the creating thread and the ones in
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.Fa attr
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are ignored.
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.It Dv PTHREAD_EXPLICIT_SCHED
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The thread scheduling attributes will be set to the corresponding values in
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.Fa attr .
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.El
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.Pp
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The following thread scheduling attributes are affected by
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.Fa inheritsched :
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.Bl -bullet -offset indent
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.It
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Scheduling policy; see
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.Xr pthread_attr_setschedpolicy 3 .
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.It
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Scheduling parameter; see
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.Xr pthread_attr_getschedparam 3 .
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.It
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Scheduling contention scope; see
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.Xr pthread_attr_getscope 3 .
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.El
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.Sh RETURN VALUES
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If successful, both functions return 0.
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Otherwise, an error number is returned to indicate the error.
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2010-07-08 22:15:27 +04:00
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.Sh COMPATIBILITY
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The standard leaves it unspecified which (if any) is the default
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inherit scheduler attribute in a newly initialized attribute object.
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2010-07-07 19:30:32 +04:00
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.Sh ERRORS
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No errors are defined for
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.Fn pthread_attr_getinheritsched .
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.Pp
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The
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.Fn pthread_attr_setinheritsched
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function may fail if:
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.Bl -tag -width Er
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.It Bq Er EINVAL
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The value specified by
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.Fa inheritsched
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is invalid.
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.El
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.Sh SEE ALSO
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.Xr pthread_attr 3
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.Sh STANDARDS
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Both functions conform to
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.St -p1003.1-2008 .
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