xref: /titanic_51/usr/src/man/man3c/pthread_attr_init.3c (revision ed22c7109fc5dd9e1b7a5d0333bdc7ad2718e2ab)
te
Copyright (c) 2008, Sun Microsystems, Inc. All Rights Reserved.
Copyright (c) 2001, the Institute of Electrical and Electronics Engineers, Inc. and The Open Group. All Rights Reserved.
Copyright 1991, 1992, 1994, The X/Open Company Ltd. All Rights Reserved.
Sun Microsystems, Inc. gratefully acknowledges The Open Group for permission to reproduce portions of its copyrighted documentation. Original documentation from The Open Group can be obtained online at
http://www.opengroup.org/bookstore/.
The Institute of Electrical and Electronics Engineers and The Open Group, have given us permission to reprint portions of their documentation. In the following statement, the phrase "this text" refers to portions of the system documentation. Portions of this text are reprinted and reproduced in electronic form in the Sun OS Reference Manual, from IEEE Std 1003.1, 2004 Edition, Standard for Information Technology -- Portable Operating System Interface (POSIX), The Open Group Base Specifications Issue 6, Copyright (C) 2001-2004 by the Institute of Electrical and Electronics Engineers, Inc and The Open Group. In the event of any discrepancy between these versions and the original IEEE and The Open Group Standard, the original IEEE and The Open Group Standard is the referee document. The original Standard can be obtained online at http://www.opengroup.org/unix/online.html.
This notice shall appear on any product containing this material.
The contents of this file are subject to the terms of the Common Development and Distribution License (the "License"). You may not use this file except in compliance with the License.
You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE or http://www.opensolaris.org/os/licensing. See the License for the specific language governing permissions and limitations under the License.
When distributing Covered Code, include this CDDL HEADER in each file and include the License file at usr/src/OPENSOLARIS.LICENSE. If applicable, add the following below this CDDL HEADER, with the fields enclosed by brackets "[]" replaced with your own identifying information: Portions Copyright [yyyy] [name of copyright owner]
PTHREAD_ATTR_INIT 3C "Apr 1, 2008"
NAME
pthread_attr_init, pthread_attr_destroy - initialize or destroy threads attribute object
SYNOPSIS

cc -mt [ flag... ] file... -lpthread [ library... ]
#include <pthread.h>

int pthread_attr_init(pthread_attr_t *attr);

int pthread_attr_destroy(pthread_attr_t *attr);
DESCRIPTION

The function pthread_attr_init() initializes a thread attributes object attr with the default value for all of the individual attributes used by a given implementation.

The resulting attribute object (possibly modified by setting individual attribute values), when used by pthread_create(), defines the attributes of the thread created. A single attributes object can be used in multiple simultaneous calls to pthread_create().

The pthread_attr_init() function initializes a thread attributes object ( attr) with the default value for each attribute as follows:

Attribute Default Value Meaning of Default
contentionscope PTHREAD_SCOPE_PROCESS resource competition within process
detachstate PTHREAD_CREATE_JOINABLE joinable by other threads
stackaddr NULL stack allocated by system
stacksize 0 1 or 2 megabyte
priority 0 priority of the thread
policy SCHED_OTHER traditional time-sharing policy
inheritsched PTHREAD_INHERIT_SCHED
scheduling policy and parameters are inherited from the creating thread
guardsize PAGESIZE
size of guard area for a thread's created stack

The pthread_attr_destroy() function destroys a thread attributes object ( attr), which cannot be reused until it is reinitialized. An implementation may cause pthread_attr_destroy() to set attr to an implementation-dependent invalid value. The behavior of using the attribute after it has been destroyed is undefined.

RETURN VALUES

Upon successful completion, pthread_attr_init() and pthread_attr_destroy() return a value of 0. Otherwise, an error number is returned to indicate the error.

ERRORS

The pthread_attr_init() function will fail if: ENOMEM

Insufficient memory exists to initialize the thread attributes object.

The pthread_attr_destroy() function may fail if: EINVAL

attr is invalid.

ATTRIBUTES

See attributes(5) for descriptions of the following attributes:

ATTRIBUTE TYPE ATTRIBUTE VALUE
Interface Stability Committed
MT-Level MT-Safe
Standard See standards(5).
SEE ALSO

sysconf(3C), pthread_attr_getdetachstate(3C), pthread_attr_getguardsize(3C), pthread_attr_getinheritsched(3C), pthread_attr_getschedparam(3C), pthread_attr_getschedpolicy(3C), pthread_attr_getscope(3C), pthread_attr_getstackaddr(3C), pthread_attr_getstacksize(3C), pthread_attr_setdetachstate(3C), pthread_attr_setguardsize(3C), pthread_attr_setinheritsched(3C), pthread_attr_setschedparam(3C), pthread_attr_setschedpolicy(3C), pthread_attr_setscope(3C), pthread_attr_setstackaddr(3C), pthread_attr_setstacksize(3C), pthread_create(3C), attributes(5), standards(5)