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/* Copyright (c) 2000, 2011, Oracle and/or its affiliates. All rights reserved.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; version 2 of the License.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1335 USA */
/* open a heap-database */
#include "heapdef.h"
#include "my_sys.h"
/*
Open heap table based on HP_SHARE structure
NOTE
This doesn't register the table in the open table list.
*/
HP_INFO *heap_open_from_share(HP_SHARE *share, int mode)
{
HP_INFO *info;
DBUG_ENTER("heap_open_from_share");
if (!(info= (HP_INFO*) my_malloc(hp_key_memory_HP_INFO,
sizeof(HP_INFO) + 2 * share->max_key_length,
MYF(MY_ZEROFILL +
(share->internal ?
MY_THREAD_SPECIFIC : 0)))))
{
DBUG_RETURN(0);
}
share->open_count++;
thr_lock_data_init(&share->lock,&info->lock,NULL);
info->s= share;
info->lastkey= (uchar*) (info + 1);
info->recbuf= (uchar*) (info->lastkey + share->max_key_length);
info->mode= mode;
info->current_record= (ulong) ~0L; /* No current record */
info->lastinx= info->errkey= -1;
#ifndef DBUG_OFF
info->opt_flag= READ_CHECK_USED; /* Check when changing */
#endif
DBUG_PRINT("exit",("heap: %p reclength: %d records_in_block: %lu",
info, share->reclength,
share->block.records_in_block));
DBUG_RETURN(info);
}
/*
Open heap table based on HP_SHARE structure and register it
*/
HP_INFO *heap_open_from_share_and_register(HP_SHARE *share, int mode)
{
HP_INFO *info;
DBUG_ENTER("heap_open_from_share_and_register");
mysql_mutex_lock(&THR_LOCK_heap);
if ((info= heap_open_from_share(share, mode)))
{
info->open_list.data= (void*) info;
heap_open_list= list_add(heap_open_list,&info->open_list);
/* Unpin the share, it is now pinned by the file. */
share->open_count--;
}
mysql_mutex_unlock(&THR_LOCK_heap);
DBUG_RETURN(info);
}
/**
Dereference a HEAP share and free it if it's not referenced.
We don't check open_count for internal tables since they
are always thread-local, i.e. referenced by a single thread.
*/
void heap_release_share(HP_SHARE *share, my_bool internal_table)
{
/* Couldn't open table; Remove the newly created table */
if (internal_table)
hp_free(share);
else
{
mysql_mutex_lock(&THR_LOCK_heap);
if (--share->open_count == 0)
hp_free(share);
mysql_mutex_unlock(&THR_LOCK_heap);
}
}
/*
Open heap table based on name
NOTE
This register the table in the open table list. so that it can be
found by future heap_open() calls.
*/
HP_INFO *heap_open(const char *name, int mode)
{
HP_INFO *info;
HP_SHARE *share;
DBUG_ENTER("heap_open");
mysql_mutex_lock(&THR_LOCK_heap);
if (!(share= hp_find_named_heap(name)))
{
my_errno= ENOENT;
mysql_mutex_unlock(&THR_LOCK_heap);
DBUG_RETURN(0);
}
if ((info= heap_open_from_share(share, mode)))
{
info->open_list.data= (void*) info;
heap_open_list= list_add(heap_open_list,&info->open_list);
}
mysql_mutex_unlock(&THR_LOCK_heap);
DBUG_RETURN(info);
}
/* map name to a heap-nr. If name isn't found return 0 */
HP_SHARE *hp_find_named_heap(const char *name)
{
LIST *pos;
HP_SHARE *info;
DBUG_ENTER("heap_find");
DBUG_PRINT("enter",("name: %s",name));
for (pos= heap_share_list; pos; pos= pos->next)
{
info= (HP_SHARE*) pos->data;
if (!strcmp(name, info->name))
{
DBUG_PRINT("exit", ("Old heap_database: %p", info));
DBUG_RETURN(info);
}
}
DBUG_RETURN((HP_SHARE *) 0);
}
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