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 * Copyright 2007 Sun Microsystems, Inc.  All rights reserved.
23 * Use is subject to license terms.
24 */
25
26#pragma ident	"%Z%%M%	%I%	%E% SMI"
27
28/*
29 * routines to wait and wake up a client waiting on a list for a
30 * name service request
31 */
32#include "cache.h"
33
34int
35nscd_wait(nsc_ctx_t *ctx, nsc_db_t *nscdb, nsc_entry_t *entry)
36{
37	waiter_t	mywait;
38	waiter_t	*wchan = &nscdb->db_wait;
39
40	(void) cond_init(&(mywait.w_waitcv), USYNC_THREAD, 0);
41	mywait.w_key = entry;
42	mywait.w_signaled = 0;
43	mywait.w_next = wchan->w_next;
44	mywait.w_prev = wchan;
45	if (mywait.w_next)
46		mywait.w_next->w_prev = &mywait;
47	wchan->w_next = &mywait;
48
49	(void) mutex_lock(&ctx->stats_mutex);
50	ctx->stats.wait_count++;
51	(void) mutex_unlock(&ctx->stats_mutex);
52
53	while (!mywait.w_signaled)
54		(void) cond_wait(&(mywait.w_waitcv), &nscdb->db_mutex);
55	if (mywait.w_prev)
56		mywait.w_prev->w_next = mywait.w_next;
57	if (mywait.w_next)
58		mywait.w_next->w_prev = mywait.w_prev;
59	return (0);
60}
61
62int
63nscd_signal(nsc_ctx_t *ctx, nsc_db_t *nscdb, nsc_entry_t *entry)
64{
65	int		c = 0;
66	waiter_t	*wchan = &nscdb->db_wait;
67	waiter_t	*tmp = wchan->w_next;
68
69	while (tmp) {
70		if (tmp->w_key == entry) {
71			(void) cond_signal(&(tmp->w_waitcv));
72			tmp->w_signaled = 1;
73
74			(void) mutex_lock(&ctx->stats_mutex);
75			ctx->stats.wait_count--;
76			(void) mutex_unlock(&ctx->stats_mutex);
77			c++;
78		}
79		tmp = tmp->w_next;
80	}
81
82	return (c);
83}
84