port/threads/pthr_rwlock.c

	pthr_rwlock.c revision 7c478bd95313f5f23a4c958a745db2134aa03244
/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License, Version 1.0 only
 * (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]
 *
 * CDDL HEADER END
 */
/*
 * Copyright 1999-2003 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */

#pragma ident   "%Z%%M% %I% %E% SMI"

#include "lint.h"
#include "thr_uberdata.h"

/*
 * UNIX98
 * pthread_rwlockattr_init: allocates the mutex attribute object and
 * initializes it with the default values.
 */
#pragma weak pthread_rwlockattr_init = _pthread_rwlockattr_init
int
_pthread_rwlockattr_init(pthread_rwlockattr_t *attr)
{
    rwlattr_t *ap;

    if ((ap = lmalloc(sizeof (rwlattr_t))) == NULL)
        return (ENOMEM);
    ap->pshared = DEFAULT_TYPE;
    attr->__pthread_rwlockattrp = ap;
    return (0);
}

/*
 * UNIX98
 * pthread_rwlockattr_destroy: frees the rwlock attribute object and
 * invalidates it with NULL value.
 */
#pragma weak pthread_rwlockattr_destroy =  _pthread_rwlockattr_destroy
int
_pthread_rwlockattr_destroy(pthread_rwlockattr_t *attr)
{
    if (attr == NULL || attr->__pthread_rwlockattrp == NULL)
        return (EINVAL);
    lfree(attr->__pthread_rwlockattrp, sizeof (rwlattr_t));
    attr->__pthread_rwlockattrp = NULL;
    return (0);
}

/*
 * UNIX98
 * pthread_rwlockattr_setpshared: sets the shared attr to PRIVATE or SHARED.
 */
#pragma weak pthread_rwlockattr_setpshared =  _pthread_rwlockattr_setpshared
int
_pthread_rwlockattr_setpshared(pthread_rwlockattr_t *attr, int pshared)
{
    rwlattr_t *ap;

    if (attr != NULL && (ap = attr->__pthread_rwlockattrp) != NULL &&
        (pshared == PTHREAD_PROCESS_PRIVATE ||
        pshared == PTHREAD_PROCESS_SHARED)) {
        ap->pshared = pshared;
        return (0);
    }
    return (EINVAL);
}

/*
 * UNIX98
 * pthread_rwlockattr_getpshared: gets the shared attr.
 */
#pragma weak pthread_rwlockattr_getpshared =  _pthread_rwlockattr_getpshared
int
_pthread_rwlockattr_getpshared(const pthread_rwlockattr_t *attr, int *pshared)
{
    rwlattr_t *ap;

    if (attr != NULL && (ap = attr->__pthread_rwlockattrp) != NULL &&
        pshared != NULL) {
        *pshared = ap->pshared;
        return (0);
    }
    return (EINVAL);
}

/*
 * UNIX98
 * pthread_rwlock_init: Initializes the rwlock object. It copies the
 * pshared attr into type argument and calls rwlock_init().
 */
#pragma weak pthread_rwlock_init = _pthread_rwlock_init
int
_pthread_rwlock_init(pthread_rwlock_t *rwlock, pthread_rwlockattr_t *attr)
{
    rwlattr_t *ap;
    int type;

    if (attr == NULL)
        type = DEFAULT_TYPE;
    else if ((ap = attr->__pthread_rwlockattrp) != NULL)
        type = ap->pshared;
    else
        return (EINVAL);

    return (__rwlock_init((rwlock_t *)rwlock, type, NULL));
}