267 lines
8.3 KiB
Groff
267 lines
8.3 KiB
Groff
.\" $NetBSD: pthread_attr.3,v 1.11 2009/10/05 23:37:01 rmind Exp $
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.\"
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.\" Copyright (c) 2002 The NetBSD Foundation, Inc.
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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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.\" 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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.\" CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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.\" SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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.\" INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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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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.\" Copyright (C) 2000 Jason Evans <jasone@FreeBSD.org>.
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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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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice(s), this list of conditions and the following disclaimer as
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.\" the first lines of this file unmodified other than the possible
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.\" addition of one or more copyright notices.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice(s), this list of conditions and the following disclaimer in
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.\" the documentation and/or other materials provided with the
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.\" distribution.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDER(S) ``AS IS'' AND ANY
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.\" EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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.\" PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) BE
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.\" LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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.\" CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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.\" SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
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.\" BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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.\" WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
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.\" OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
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.\" EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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.\"
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.\" $FreeBSD: src/lib/libpthread/man/pthread_attr.3,v 1.11 2002/09/16 19:29:28 mini Exp $
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.\"
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.Dd October 6, 2009
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.Dt PTHREAD_ATTR 3
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.Os
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.Sh NAME
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.Nm pthread_attr_init ,
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.Nm pthread_attr_destroy ,
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.Nm pthread_attr_setstacksize ,
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.Nm pthread_attr_getstacksize ,
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.Nm pthread_attr_setguardsize ,
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.Nm pthread_attr_getguardsize ,
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.Nm pthread_attr_setstackaddr ,
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.Nm pthread_attr_getstackaddr ,
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.Nm pthread_attr_setdetachstate ,
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.Nm pthread_attr_getdetachstate ,
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.Nm pthread_attr_setinheritsched ,
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.Nm pthread_attr_getinheritsched ,
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.Nm pthread_attr_setschedparam ,
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.Nm pthread_attr_getschedparam
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.Nm pthread_attr_setschedpolicy ,
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.Nm pthread_attr_getschedpolicy ,
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.Nm pthread_attr_setscope ,
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.Nm pthread_attr_getscope
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.Nd thread attribute operations
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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_init "pthread_attr_t *attr"
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.Ft int
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.Fn pthread_attr_destroy "pthread_attr_t *attr"
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.Ft int
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.Fn pthread_attr_setstacksize "pthread_attr_t *attr" "size_t stacksize"
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.Ft int
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.Fn pthread_attr_getstacksize "const pthread_attr_t * restrict attr" "size_t * restrict stacksize"
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.Ft int
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.Fn pthread_attr_setguardsize "pthread_attr_t *attr" "size_t guardsize"
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.Ft int
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.Fn pthread_attr_getguardsize "const pthread_attr_t * restrict attr" "size_t * restrict guardsize"
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.Ft int
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.Fn pthread_attr_setstackaddr "pthread_attr_t *attr" "void *stackaddr"
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.Ft int
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.Fn pthread_attr_getstackaddr "const pthread_attr_t * restrict attr" "void ** restrict stackaddr"
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.Ft int
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.Fn pthread_attr_setdetachstate "pthread_attr_t *attr" "int detachstate"
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.Ft int
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.Fn pthread_attr_getdetachstate "const pthread_attr_t *attr" "int *detachstate"
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.Ft int
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.Fn pthread_attr_setinheritsched "pthread_attr_t *attr" "int inheritsched"
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.Ft int
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.Fn pthread_attr_getinheritsched "const pthread_attr_t * restrict attr" "int * restrict inheritsched"
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.Ft int
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.Fn pthread_attr_setschedparam "pthread_attr_t * restrict attr" "const struct sched_param * restrict param"
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.Ft int
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.Fn pthread_attr_getschedparam "const pthread_attr_t * restrict attr" "struct sched_param * restrict param"
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.Ft int
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.Fn pthread_attr_setschedpolicy "pthread_attr_t *attr" "int policy"
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.Ft int
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.Fn pthread_attr_getschedpolicy "const pthread_attr_t * restrict attr" "int * restrict policy"
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.Ft int
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.Fn pthread_attr_setscope "pthread_attr_t *attr" "int contentionscope"
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.Ft int
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.Fn pthread_attr_getscope "const pthread_attr_t * restrict attr" "int * restrict contentionscope"
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.Sh DESCRIPTION
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Thread attributes are used to specify parameters to
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.Fn pthread_create .
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One attribute object can be used in multiple calls to
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.Fn pthread_create ,
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with or without modifications between calls.
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.Pp
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The
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.Fn pthread_attr_init
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function initializes
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.Fa attr
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with all the default thread attributes.
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.Pp
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The
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.Fn pthread_attr_destroy
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function destroys
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.Fa attr .
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.Pp
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The
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.Fn pthread_attr_set*
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functions set the attribute that corresponds to each function name.
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.Pp
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The
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.Fn pthread_attr_get*
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functions copy the value of the attribute that corresponds to each function name
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to the location pointed to by the second function parameter.
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.Pp
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The attribute parameters for the
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.Fn pthread_attr_setdetachstate
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and
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.Fn pthread_attr_getdetachstate
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are mutually exclusive and must be one of:
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.Bl -tag -width xxxxxxxx
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.It Dv PTHREAD_CREATE_JOINABLE
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The threads must explicitly be waited for using the
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.Fn pthread_join
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function once they exit for their status to be received and their resources
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to be freed.
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This is the default.
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.It Dv PTHREAD_CREATE_DETACHED
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The thread's resources will automatically be freed once the thread exits,
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and the thread will not be joined.
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.El
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.Sh RETURN VALUES
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If successful, these functions return 0.
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Otherwise, an error number is returned to indicate the error.
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.Sh ERRORS
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.Fn pthread_attr_init
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should fail if:
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.Bl -tag -width Er
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.It Bq Er ENOMEM
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Out of memory.
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.El
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.Pp
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.Fn pthread_attr_destroy
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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 attr
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is invalid.
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.El
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.Pp
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.Fn pthread_attr_setstacksize
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may fail if:
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.Bl -tag -width Er
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.It Bq Er EINVAL
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.Fa stacksize
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is less than
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.Dv PTHREAD_STACK_MIN .
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.El
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.Pp
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.Fn pthread_attr_setdetachstate
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should 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 detachstate
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is invalid.
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.El
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.Pp
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Fn pthread_attr_setinheritsched
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may fail if:
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.Bl -tag -width Er
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.It Bq Er EINVAL
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Invalid value for
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.Fa attr .
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.El
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.Pp
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.Fn pthread_attr_setschedparam
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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 attr
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is invalid.
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.It Bq Er ENOTSUP
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The value specified by
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.Fa param
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is invalid.
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.El
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.Pp
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.Fn pthread_attr_setschedpolicy
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may fail if:
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.Bl -tag -width Er
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.It Bq Er EINVAL
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Invalid value for
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.Fa attr .
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.It Bq Er ENOTSUP
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Invalid or unsupported value for
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.Fa policy .
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.El
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.Pp
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.Fn pthread_attr_setscope
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may fail if:
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.Bl -tag -width Er
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.It Bq Er EINVAL
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Invalid value for
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.Fa attr .
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.It Bq Er ENOTSUP
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Invalid or unsupported value for
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.Fa contentionscope .
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.El
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.Sh SEE ALSO
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.Xr pthread_create 3 ,
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.Xr pthread_join 3
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.Sh STANDARDS
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.Fn pthread_attr_init ,
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.Fn pthread_attr_destroy ,
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.Fn pthread_attr_setstacksize ,
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.Fn pthread_attr_getstacksize ,
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.Fn pthread_attr_setstackaddr ,
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.Fn pthread_attr_getstackaddr ,
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.Fn pthread_attr_setdetachstate ,
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.Fn pthread_attr_getdetachstate ,
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.Fn pthread_attr_setinheritsched ,
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.Fn pthread_attr_getinheritsched ,
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.Fn pthread_attr_setschedparam ,
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.Fn pthread_attr_setschedparam ,
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and
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.Fn pthread_attr_getschedparam
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.Fn pthread_attr_setschedpolicy ,
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.Fn pthread_attr_getschedpolicy ,
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.Fn pthread_attr_setscope ,
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and
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.Fn pthread_attr_getscope
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conform to
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.St -p1003.1-96 .
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