1/*
2 * CDDL HEADER START
3 *
4 * The contents of this file are subject to the terms of the
5 * Common Development and Distribution License (the "License").
6 * You may not use this file except in compliance with the License.
7 *
8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9 * or http://www.opensolaris.org/os/licensing.
10 * See the License for the specific language governing permissions
11 * and limitations under the License.
12 *
13 * When distributing Covered Code, include this CDDL HEADER in each
14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15 * If applicable, add the following below this CDDL HEADER, with the
16 * fields enclosed by brackets "[]" replaced with your own identifying
17 * information: Portions Copyright [yyyy] [name of copyright owner]
18 *
19 * CDDL HEADER END
20 */
21
22/*
23 * Copyright 2008 Sun Microsystems, Inc.  All rights reserved.
24 * Use is subject to license terms.
25 */
26
27#include <stdio.h>
28#include <stdlib.h>
29#include <unistd.h>
30#include <pthread.h>
31#include <synch.h>
32
33#include "isns_server.h"
34#include "isns_msgq.h"
35#include "isns_cache.h"
36#include "isns_obj.h"
37#include "isns_log.h"
38
39msg_queue_t *
40queue_calloc(
41)
42{
43	msg_queue_t *q;
44
45	q = (msg_queue_t *)calloc(1, sizeof (msg_queue_t));
46
47	if (q) {
48		if (sema_init(&q->q_sema, 0, USYNC_THREAD, NULL) ||
49		    pthread_mutex_init(&q->q_mutex, NULL)) {
50			free(q);
51			q = NULL;
52		}
53	}
54
55	return (q);
56}
57
58int
59queue_msg_set(
60	msg_queue_t *q,
61	msg_id_t id,
62	void *data
63)
64{
65	msg_text_t *msg;
66
67	msg = (msg_text_t *)calloc(1, sizeof (msg_text_t));
68
69	if (!msg) {
70		return (1);
71	}
72
73	msg->id = id;
74	msg->data = data;
75
76	(void) pthread_mutex_lock(&q->q_mutex);
77
78	if (q->q_head == NULL) {
79		ASSERT(!q->q_tail);
80		q->q_head = msg;
81		q->q_tail = msg;
82	} else {
83		ASSERT(q->q_tail);
84		q->q_tail->next = msg;
85		msg->prev = q->q_tail;
86		q->q_tail = msg;
87	}
88
89	(void) pthread_mutex_unlock(&q->q_mutex);
90
91	(void) sema_post(&q->q_sema);
92
93	return (0);
94}
95
96msg_text_t *
97queue_msg_get(
98	msg_queue_t *q
99)
100{
101	msg_text_t *msg;
102
103	while (sema_wait(&q->q_sema)) {
104		(void) sleep(1);
105	}
106
107	(void) pthread_mutex_lock(&q->q_mutex);
108
109	msg = q->q_head;
110	ASSERT(msg);
111	q->q_head = msg->next;
112	if (q->q_head == NULL) {
113		q->q_tail = NULL;
114	}
115
116	(void) pthread_mutex_unlock(&q->q_mutex);
117
118	return (msg);
119}
120
121void
122queue_msg_free(
123	msg_text_t *msg
124)
125{
126	free(msg);
127}
128