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, Version 1.0 only 6 * (the "License"). You may not use this file except in compliance 7 * with the License. 8 * 9 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 10 * or http://www.opensolaris.org/os/licensing. 11 * See the License for the specific language governing permissions 12 * and limitations under the License. 13 * 14 * When distributing Covered Code, include this CDDL HEADER in each 15 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 16 * If applicable, add the following below this CDDL HEADER, with the 17 * fields enclosed by brackets "[]" replaced with your own identifying 18 * information: Portions Copyright [yyyy] [name of copyright owner] 19 * 20 * CDDL HEADER END 21 */ 22 /* 23 * Copyright 2015 Gary Mills 24 * Copyright 2003 Sun Microsystems, Inc. All rights reserved. 25 * Use is subject to license terms. 26 */ 27 28 /* 29 * DESCRIPTION: Contains a front end to the map locking code. These are called 30 * when a map, or its map_ctrl structure, needs to be locked 31 * for a short time for internal modification. This lock should 32 * not be held between DBM operations. 33 * 34 * NOTE : This is not the same mechanism as the `update lock` which is 35 * held for a relatively long period when a map is being update 36 * from the DIT. 37 */ 38 39 #include <unistd.h> 40 #include <syslog.h> 41 #include <sys/mman.h> 42 #include <thread.h> 43 #include <synch.h> 44 #include <ndbm.h> 45 #include "ypsym.h" 46 #include "shim.h" 47 #include "stubs.h" 48 49 /* 50 * FUNCTION : lock_map_ctrl() 51 * 52 * DESCRIPTION: Front end to the lock routine taking map_ctrl structure as 53 * argument. Saves cost of a hash operation. 54 * 55 * GIVEN : Map_ctrl structure . 56 * 57 * RETURNS : Same as lock core 58 */ 59 int 60 lock_map_ctrl(map_ctrl *map) 61 { 62 int ret; 63 64 ret = lock_core(map->hash_val); 65 66 return (ret); 67 } 68 69 /* 70 * FUNCTION : unlock_map_ctrl() 71 * 72 * DESCRIPTION: Front end to the unlock routine taking map_ctrl structure as 73 * argument. Saves cost of a hash operation. 74 * 75 * GIVEN : Map_ctrl structure . 76 * 77 * RETURNS : Same as lock core 78 */ 79 int 80 unlock_map_ctrl(map_ctrl *map) 81 { 82 int ret; 83 84 ret = unlock_core(map->hash_val); 85 return (ret); 86 } 87