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/*-
* See the file LICENSE for redistribution information.
*
* Copyright (c) 1996, 1997
* Sleepycat Software. All rights reserved.
*/
#include "config.h"
#ifndef lint
static const char sccsid[] = "@(#)lock_util.c 10.4 (Sleepycat) 7/22/97";
#endif /* not lint */
#ifndef NO_SYSTEM_INCLUDES
#include <sys/types.h>
#include <fcntl.h>
#include <stddef.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#endif
#include "db_int.h"
#include "shqueue.h"
#include "db_page.h"
#include "db_shash.h"
#include "hash.h"
#include "lock.h"
/*
* This function is used to compare a DBT that is about to be entered
* into a hash table with an object already in the hash table. Note
* that it just returns true on equal and 0 on not-equal. Therefore this
* cannot be used as a sort function; its purpose is to be used as a
* hash comparison function.
* PUBLIC: int __lock_cmp __P((DBT *, DB_LOCKOBJ *));
*/
int
__lock_cmp(dbt, lock_obj)
DBT *dbt;
DB_LOCKOBJ *lock_obj;
{
void *obj_data;
if (lock_obj->type != DB_LOCK_OBJTYPE)
return (0);
obj_data = SH_DBT_PTR(&lock_obj->lockobj);
return (dbt->size == lock_obj->lockobj.size &&
memcmp(dbt->data, obj_data, dbt->size) == 0);
}
/*
* PUBLIC: int __lock_locker_cmp __P((u_int32_t, DB_LOCKOBJ *));
*/
int
__lock_locker_cmp(locker, lock_obj)
u_int32_t locker;
DB_LOCKOBJ *lock_obj;
{
void *obj_data;
if (lock_obj->type != DB_LOCK_LOCKER)
return (0);
obj_data = SH_DBT_PTR(&lock_obj->lockobj);
return (memcmp(&locker, obj_data, sizeof(u_int32_t)) == 0);
}
/*
* PUBLIC: int __lock_ohash __P((DBT *));
*/
int
__lock_ohash(dbt)
DBT *dbt;
{
return (__ham_func5(dbt->data, dbt->size));
}
/*
* PUBLIC: u_int32_t __lock_locker_hash __P((u_int32_t));
*/
u_int32_t
__lock_locker_hash(locker)
u_int32_t locker;
{
return (__ham_func5(&locker, sizeof(locker)));
}
/*
* PUBLIC: u_int32_t __lock_lhash __P((DB_LOCKOBJ *));
*/
u_int32_t
__lock_lhash(lock_obj)
DB_LOCKOBJ *lock_obj;
{
void *obj_data;
obj_data = SH_DBT_PTR(&lock_obj->lockobj);
return (__ham_func5(obj_data, lock_obj->lockobj.size));
}
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