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