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/*
* 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 2002 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*/
#pragma ident "%Z%%M% %I% %E% SMI"
/*
* av1394 queue
* Based on av1394 list, plus locking, works only with mblk's,
* counts and limits amount of data on the queue.
*/
#include <sys/stream.h>
#include <sys/strsun.h>
#include <sys/1394/targets/av1394/av1394_impl.h>
typedef void (*putfunc_t)(av1394_list_t *, void *);
static mblk_t *av1394_getq_locked(av1394_queue_t *);
static int av1394_put_common(av1394_queue_t *, mblk_t *, putfunc_t);
void
av1394_initq(av1394_queue_t *q, ddi_iblock_cookie_t ibc, int max)
{
bzero(q, sizeof (av1394_queue_t));
mutex_init(&q->q_mutex, NULL, MUTEX_DRIVER, ibc);
cv_init(&q->q_cv, NULL, CV_DRIVER, NULL);
AV1394_ENTERQ(q);
av1394_list_init(&q->q_list);
q->q_max = max;
AV1394_LEAVEQ(q);
}
void
av1394_destroyq(av1394_queue_t *q)
{
av1394_flushq(q);
mutex_destroy(&q->q_mutex);
cv_destroy(&q->q_cv);
}
void
av1394_setmaxq(av1394_queue_t *q, int max)
{
AV1394_ENTERQ(q);
q->q_max = max;
AV1394_LEAVEQ(q);
}
int
av1394_getmaxq(av1394_queue_t *q)
{
int max;
AV1394_ENTERQ(q);
max = q->q_max;
AV1394_LEAVEQ(q);
return (max);
}
void
av1394_flushq(av1394_queue_t *q)
{
mblk_t *bp;
AV1394_ENTERQ(q);
while ((bp = av1394_getq_locked(q)) != NULL) {
freemsg(bp);
}
ASSERT(q->q_size == 0);
AV1394_LEAVEQ(q);
}
int
av1394_putq(av1394_queue_t *q, mblk_t *bp)
{
return (av1394_put_common(q, bp, av1394_list_put_tail));
}
int
av1394_putbq(av1394_queue_t *q, mblk_t *bp)
{
return (av1394_put_common(q, bp, av1394_list_put_head));
}
mblk_t *
av1394_getq(av1394_queue_t *q)
{
mblk_t *bp;
AV1394_ENTERQ(q);
bp = av1394_getq_locked(q);
AV1394_LEAVEQ(q);
return (bp);
}
mblk_t *
av1394_peekq(av1394_queue_t *q)
{
mblk_t *mp;
AV1394_ENTERQ(q);
mp = av1394_peekq_locked(q);
AV1394_LEAVEQ(q);
return (mp);
}
mblk_t *
av1394_peekq_locked(av1394_queue_t *q)
{
ASSERT(mutex_owned(&q->q_mutex));
return (av1394_list_head(&q->q_list));
}
/*
* wait until queue is not empty or a signal arrives
*/
int
av1394_qwait_sig(av1394_queue_t *q)
{
int ret = 1;
AV1394_ENTERQ(q);
while (av1394_peekq_locked(q) == NULL) {
if ((ret = cv_wait_sig(&q->q_cv, &q->q_mutex)) <= 0) {
break;
}
}
AV1394_LEAVEQ(q);
return (ret);
}
static int
av1394_put_common(av1394_queue_t *q, mblk_t *bp, putfunc_t put)
{
int ret;
int len = MBLKL(bp);
AV1394_ENTERQ(q);
if (q->q_size + len > q->q_max) {
ret = 0;
} else {
put(&q->q_list, bp);
q->q_size += len;
cv_broadcast(&q->q_cv);
ret = 1;
}
AV1394_LEAVEQ(q);
return (ret);
}
static mblk_t *
av1394_getq_locked(av1394_queue_t *q)
{
mblk_t *bp;
if ((bp = av1394_list_get_head(&q->q_list)) != NULL) {
q->q_size -= MBLKL(bp);
ASSERT(q->q_size >= 0);
}
return (bp);
}
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