usr/src/lib/libnisdb/nis_hashitem.h

   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 2004 Sun Microsystems, Inc.  All rights reserved.
  24  * Use is subject to license terms.
  25  */
  26
  27 #ifndef _NIS_HASHITEM_H
  28 #define _NIS_HASHITEM_H
  29
  30 #pragma ident   "%Z%%M% %I%     %E% SMI"
  31
  32 #include <pthread.h>
  33 #include <rpcsvc/nis.h>
  34
  35 #include "nisdb_rw.h"
  36
  37 #ifdef  __cplusplus
  38 extern "C" {
  39 #endif
  40
  41 /* Private versions of the various NIS_HASH_ITEM functions */
  42 typedef struct __nis_item_item {
  43         pthread_cond_t          lock;
  44         nis_name                name;
  45         int                     keychain;
  46         uint32_t                readers;
  47         pthread_t               last_reader_id;
  48         uint32_t                writer;
  49         pthread_t               writer_id;
  50         struct __nis_item_item  *next;
  51         struct __nis_item_item  *prv_item;
  52         struct __nis_item_item  *nxt_item;
  53 } __nis_hash_item_mt;
  54
  55 typedef struct {
  56         pthread_mutex_t         lock;
  57         pthread_cond_t          cond;
  58         pthread_mutex_t         traverser_id_lock;
  59                                                         /*
  60                                                          * Protects 'traversed'
  61                                                          * and 'traverser_id'.
  62                                                          */
  63         uint32_t                traversed;
  64         pthread_t               traverser_id;
  65         uint32_t                locked_items;
  66         __nis_hash_item_mt      *keys[64];
  67         __nis_hash_item_mt      *first;
  68         void                    (*destroyItem)(void *);
  69 } __nis_hash_table_mt;
  70
  71 #define NIS_HASH_TABLE_MT_INIT  { \
  72                                         PTHREAD_MUTEX_INITIALIZER, \
  73                                         {0}, \
  74                                         PTHREAD_MUTEX_INITIALIZER \
  75                                         /* Zero is fine for the rest */ \
  76                                 }
  77
  78 #define LOCK_LIST(list, msg)    (void) __nis_lock_hash_table(list, 1, msg)
  79 #define ULOCK_LIST(list, msg)   (void) __nis_ulock_hash_table(list, 1, msg)
  80
  81
  82 extern void     __nis_init_hash_table(__nis_hash_table_mt *, void (*)(void *));
  83 extern int      __nis_lock_hash_table(__nis_hash_table_mt *, int, char *);
  84 extern int      __nis_ulock_hash_table(__nis_hash_table_mt *, int, char *);
  85 extern int      __nis_insert_item_mt(void *, __nis_hash_table_mt *, int);
  86 extern void     __nis_insert_name_mt(nis_name, __nis_hash_table_mt *);
  87 extern void     *__nis_find_item_mt(nis_name, __nis_hash_table_mt *, int,
  88                                         int *);
  89 extern void     *__nis_pop_item_mt(__nis_hash_table_mt *);
  90 extern void     *__nis_remove_item_mt(nis_name, __nis_hash_table_mt *);
  91 extern int      __nis_release_item(void *, __nis_hash_table_mt *, int);
  92 extern int      __nis_item_access(void *);
  93 extern void     __nis_scan_table_mt(__nis_hash_table_mt *,
  94                         bool_t (*)(__nis_hash_item_mt *, void *), void *);
  95
  96 /* Define-magic */
  97 #define NIS_HASH_ITEM                   __nis_hash_item_mt
  98 #define NIS_HASH_TABLE                  __nis_hash_table_mt
  99 #define nis_insert_item(i, t)           __nis_insert_item_mt(i, t, -1)
 100 #define nis_insert_item_rw(i, t, rw)    __nis_insert_item_mt(i, t, rw)
 101 #define nis_insert_name(n, t)           __nis_insert_name_mt(n, t)
 102 #define nis_find_item(i, t)             __nis_find_item_mt(i, t, -1, 0)
 103 #define nis_find_item_rw(i, t, rw)      __nis_find_item_mt(i, t, rw, 0)
 104 #define nis_pop_item                    __nis_pop_item_mt
 105 #define nis_remove_item                 __nis_remove_item_mt
 106 #define nis_scan_table                  __nis_scan_table_mt
 107
 108 #define MT_LOCK_TYPE(type)              (type < 0)?"W":(type > 0)?"R":"N"
 109
 110 #ifdef  NIS_MT_DEBUG
 111 #define MT_LOG(condition, syslogarg)    if (condition) syslog ## syslogarg
 112 #else
 113 #define MT_LOG(condition, syslogarg)
 114 #endif  /* NIS_MT_DEBUG */
 115
 116 #ifdef  __cplusplus
 117 }
 118 #endif  /* __cplusplus */
 119
 120 #endif  /* _NIS_HASHITEM_H */