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 34 int 35 nscd_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 62 int 63 nscd_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