104 lines
2.1 KiB
C
104 lines
2.1 KiB
C
/*-
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* See the file LICENSE for redistribution information.
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*
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* Copyright (c) 1996, 1997
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* Sleepycat Software. All rights reserved.
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*/
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#include "config.h"
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#ifndef lint
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static const char sccsid[] = "@(#)lock_util.c 10.5 (Sleepycat) 1/8/98";
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#endif /* not lint */
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#ifndef NO_SYSTEM_INCLUDES
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#include <sys/types.h>
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#include <fcntl.h>
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#include <stddef.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#endif
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#include "db_int.h"
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#include "shqueue.h"
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#include "db_page.h"
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#include "db_shash.h"
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#include "hash.h"
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#include "lock.h"
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/*
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* This function is used to compare a DBT that is about to be entered
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* into a hash table with an object already in the hash table. Note
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* that it just returns true on equal and 0 on not-equal. Therefore this
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* cannot be used as a sort function; its purpose is to be used as a
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* hash comparison function.
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* PUBLIC: int __lock_cmp __P((const DBT *, DB_LOCKOBJ *));
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*/
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int
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__lock_cmp(dbt, lock_obj)
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const DBT *dbt;
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DB_LOCKOBJ *lock_obj;
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{
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void *obj_data;
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if (lock_obj->type != DB_LOCK_OBJTYPE)
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return (0);
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obj_data = SH_DBT_PTR(&lock_obj->lockobj);
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return (dbt->size == lock_obj->lockobj.size &&
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memcmp(dbt->data, obj_data, dbt->size) == 0);
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}
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/*
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* PUBLIC: int __lock_locker_cmp __P((u_int32_t, DB_LOCKOBJ *));
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*/
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int
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__lock_locker_cmp(locker, lock_obj)
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u_int32_t locker;
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DB_LOCKOBJ *lock_obj;
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{
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void *obj_data;
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if (lock_obj->type != DB_LOCK_LOCKER)
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return (0);
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obj_data = SH_DBT_PTR(&lock_obj->lockobj);
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return (memcmp(&locker, obj_data, sizeof(u_int32_t)) == 0);
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}
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/*
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* PUBLIC: int __lock_ohash __P((const DBT *));
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*/
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int
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__lock_ohash(dbt)
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const DBT *dbt;
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{
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return (__ham_func5(dbt->data, dbt->size));
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}
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/*
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* PUBLIC: u_int32_t __lock_locker_hash __P((u_int32_t));
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*/
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u_int32_t
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__lock_locker_hash(locker)
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u_int32_t locker;
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{
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return (__ham_func5(&locker, sizeof(locker)));
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}
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/*
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* PUBLIC: u_int32_t __lock_lhash __P((DB_LOCKOBJ *));
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*/
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u_int32_t
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__lock_lhash(lock_obj)
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DB_LOCKOBJ *lock_obj;
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{
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void *obj_data;
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obj_data = SH_DBT_PTR(&lock_obj->lockobj);
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return (__ham_func5(obj_data, lock_obj->lockobj.size));
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}
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