lvm/rpc.metamedd/med_synch.c

/*
 * 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 (c) 1994, 2000 by Sun Microsystems, Inc.
 * All rights reserved.
 */

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

#include "med_local.h"

#ifdef  _REENTRANT
/*
 * manipulate conditional variables, handle errors
 */
void
med_cv_init(
    cond_t  *cvp
)
{
    if (cond_init(cvp, USYNC_THREAD, NULL) != 0) {
        med_perror("cond_init");
        med_exit(1);
    }
}

void
med_cv_destroy(
    cond_t  *cvp
)
{
    if (cond_destroy(cvp) != 0) {
        med_perror("cond_destroy");
        med_exit(1);
    }
}

void
med_cv_wait(
    cond_t  *cvp,
    mutex_t *mp
)
{
    int err;

    assert(MUTEX_HELD(mp));
    if (((err = cond_wait(cvp, mp)) != 0) &&
        (err != EINTR)) {
        errno = err;
        med_perror("cond_wait");
        med_exit(1);
    }
}

void
med_cv_timedwait(
    cond_t          *cvp,
    mutex_t         *mp,
    med_msec_t      to
)
{
    struct itimerval    new, old;
    int         err;

    /* check lock */
    assert(MUTEX_HELD(mp));
    assert(to != 0);

    /* set timer */
    new.it_interval.tv_sec = 0;
    new.it_interval.tv_usec = 0;
    new.it_value.tv_sec = to / 1000;
    new.it_value.tv_usec = (to % 1000) * 1000;
    if (setitimer(ITIMER_REAL, &new, &old) != 0) {
        med_perror("cond_wait");
        med_exit(1);
    }

    /* wait for condition or timeout */
    if (((err = cond_wait(cvp, mp)) != 0) &&
        (err != EINTR)) {
        errno = err;
        med_perror("cond_wait");
        med_exit(1);
    }

    /* reset timer */
    if (err != EINTR) {
        new.it_interval.tv_sec = 0;
        new.it_interval.tv_usec = 0;
        new.it_value.tv_sec = 0;
        new.it_value.tv_usec = 0;
        if (setitimer(ITIMER_REAL, &new, &old) != 0) {
            med_perror("cond_wait");
            med_exit(1);
        }
    }
}

void
med_cv_broadcast(
    cond_t  *cvp
)
{
    if (cond_broadcast(cvp) != 0) {
        med_perror("cond_broadcast");
        med_exit(1);
    }
}

/*
 * manipulate mutexs, handle errors
 */
void
med_mx_init(
    mutex_t *mp
)
{
    if (mutex_init(mp, USYNC_THREAD, NULL) != 0) {
        med_perror("mutex_init");
        med_exit(1);
    }
}

void
med_mx_destroy(
    mutex_t *mp
)
{
    if (mutex_destroy(mp) != 0) {
        med_perror("mutex_destroy");
        med_exit(1);
    }
}

void
med_mx_lock(
    mutex_t *mp
)
{
    if (mutex_lock(mp) != 0) {
        med_perror("mutex_lock");
        med_exit(1);
    }
}

void
med_mx_unlock(
    mutex_t *mp
)
{
    assert(MUTEX_HELD(mp));
    if (mutex_unlock(mp) != 0) {
        med_perror("mutex_unlock");
        med_exit(1);
    }
}

/*
 * manipulate rwlockss, handle errors
 */
void
med_rw_rdlock(
    rwlock_t    *rwlp
)
{
    if (rw_rdlock(rwlp) != 0) {
        med_perror("rw_rdlock");
        med_exit(1);
    }
}

void
med_rw_wrlock(
    rwlock_t    *rwlp
)
{
    if (rw_wrlock(rwlp) != 0) {
        med_perror("rw_wrlock");
        med_exit(1);
    }
}

void
med_rw_unlock(
    rwlock_t    *rwlp
)
{
    if (rw_unlock(rwlp) != 0) {
        med_perror("rw_unlock");
        med_exit(1);
    }
}
#endif  /* _REENTRANT */