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 SunOS 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]


Copyright 1991, 1992, 1994, The X/Open Company Ltd.
Copyright (c) 2001, The IEEE and The Open Group. All Rights Reserved.
Copyright (c) 2008, Sun Microsystems, Inc. All Rights Reserved.

pthread_condattr_init, pthread_condattr_destroy - initialize or destroy condition variable attributes object

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

int pthread_condattr_init(pthread_condattr_t *attr);

int pthread_condattr_destroy(pthread_condattr_t *attr);

The pthread_condattr_init() function initializes a condition variable attributes object attr with the default value for all of the attributes defined by the implementation.

At present, the only attribute available is the scope of condition variables. The default scope of the attribute is PTHREAD_PROCESS_PRIVATE.

Attempts to initialize previously initialized condition variable attributes object will leave the storage allocated by the previous initialization unallocated.

After a condition variable attributes object has been used to initialize one or more condition variables, any function affecting the attributes object (including destruction) does not affect any previously initialized condition variables.

The pthread_condattr_destroy() function destroys a condition variable attributes object; the object becomes, in effect, uninitialized. An implementation may cause pthread_condattr_destroy() to set the object referenced by attr to an invalid value. A destroyed condition variable attributes object can be re-initialized using pthread_condattr_init(); the results of otherwise referencing the object after it has been destroyed are undefined.

Additional attributes, their default values, and the names of the associated functions to get and set those attribute values are implementation-dependent.

If successful, the pthread_condattr_init() and pthread_condattr_destroy() functions return 0. Otherwise, an error number is returned to indicate the error.

The pthread_condattr_init() function will fail if: ENOMEM

The pthread_condattr_destroy() function may fail if: EINVAL

See attributes(7) for descriptions of the following attributes:

ATTRIBUTE TYPE ATTRIBUTE VALUE

Interface Stability Standard

MT-Level MT-Safe

pthread_cond_init (3C), pthread_condattr_getpshared (3C), pthread_condattr_setpshared (3C), pthread_create (3C), pthread_mutex_init (3C), attributes (7), standards (7)