port/threads/pthr_cond.c

	pthr_cond.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 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"

/*
 * pthread_condattr_init: allocates the cond attribute object and
 * initializes it with the default values.
 */
#pragma weak pthread_condattr_init = _pthread_condattr_init
int
_pthread_condattr_init(pthread_condattr_t *attr)
{
    cvattr_t *ap;

    if ((ap = lmalloc(sizeof (cvattr_t))) == NULL)
        return (ENOMEM);
    ap->pshared = DEFAULT_TYPE;
    ap->clockid = CLOCK_REALTIME;
    attr->__pthread_condattrp = ap;
    return (0);
}

/*
 * pthread_condattr_destroy: frees the cond attribute object and
 * invalidates it with NULL value.
 */
#pragma weak pthread_condattr_destroy = _pthread_condattr_destroy
int
_pthread_condattr_destroy(pthread_condattr_t *attr)
{
    if (attr == NULL || attr->__pthread_condattrp == NULL)
        return (EINVAL);
    lfree(attr->__pthread_condattrp, sizeof (cvattr_t));
    attr->__pthread_condattrp = NULL;
    return (0);
}

/*
 * pthread_condattr_setclock: sets the clockid attribute.
 */
#pragma weak pthread_condattr_setclock = _pthread_condattr_setclock
int
_pthread_condattr_setclock(pthread_condattr_t *attr, clockid_t clock_id)
{
    cvattr_t *ap;

    if (attr != NULL && (ap = attr->__pthread_condattrp) != NULL &&
        (clock_id == CLOCK_REALTIME || clock_id == CLOCK_HIGHRES)) {
        ap->clockid = clock_id;
        return (0);
    }
    return (EINVAL);
}

/*
 * pthread_condattr_getclock: gets the shared attr.
 */
#pragma weak pthread_condattr_getclock = _pthread_condattr_getclock
int
_pthread_condattr_getclock(const pthread_condattr_t *attr, clockid_t *clock_id)
{
    cvattr_t *ap;

    if (attr != NULL && (ap = attr->__pthread_condattrp) != NULL &&
        clock_id != NULL) {
        *clock_id = ap->clockid;
        return (0);
    }
    return (EINVAL);
}


/*
 * pthread_condattr_setpshared: sets the shared attr to PRIVATE or SHARED.
 * This is equivalent to setting USYNC_PROCESS/USYNC_THREAD flag in cond_init().
 */
#pragma weak pthread_condattr_setpshared = _pthread_condattr_setpshared
int
_pthread_condattr_setpshared(pthread_condattr_t *attr, int pshared)
{
    cvattr_t *ap;

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

/*
 * pthread_condattr_getpshared: gets the shared attr.
 */
#pragma weak pthread_condattr_getpshared = _pthread_condattr_getpshared
int
_pthread_condattr_getpshared(const pthread_condattr_t *attr, int *pshared)
{
    cvattr_t *ap;

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

/*
 * pthread_cond_init: Initializes the cond object. It copies the
 * pshared attr into type argument and calls cond_init().
 */
#pragma weak pthread_cond_init = _pthread_cond_init
int
_pthread_cond_init(pthread_cond_t *cond, const pthread_condattr_t *attr)
{
    cvattr_t *ap;
    int type;
    clockid_t clock_id;
    int error;

    if (attr == NULL) {
        type = DEFAULT_TYPE;
        clock_id = CLOCK_REALTIME;
    } else if ((ap = attr->__pthread_condattrp) != NULL) {
        type = ap->pshared;
        clock_id = ap->clockid;
    } else {
        return (EINVAL);
    }

    if (clock_id != CLOCK_REALTIME && clock_id != CLOCK_HIGHRES)
        error = EINVAL;
    else if ((error = _cond_init((cond_t *)cond, type, NULL)) == 0)
        ((cond_t *)cond)->cond_clockid = (uint8_t)clock_id;

    return (error);
}