mirror of
https://github.com/MariaDB/server.git
synced 2025-01-18 13:02:28 +01:00
dd81895e45
Now we don't take any mutexes when creating or dropping internal HEAP tables during SELECT. Change buffer sizes to size_t to make keycache 64 bit safe on platforms where sizeof(ulong) != sizeof(size_t)
135 lines
3.4 KiB
C
135 lines
3.4 KiB
C
/* Copyright (C) 2000-2004, 2006 MySQL AB
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; version 2 of the License.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */
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/* open a heap-database */
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#include "heapdef.h"
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#ifdef VMS
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#include "hp_static.c" /* Stupid vms-linker */
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#endif
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#include "my_sys.h"
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/*
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Open heap table based on HP_SHARE structure
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NOTE
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This doesn't register the table in the open table list.
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*/
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HP_INFO *heap_open_from_share(HP_SHARE *share, int mode)
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{
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HP_INFO *info;
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DBUG_ENTER("heap_open_from_share");
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if (!(info= (HP_INFO*) my_malloc((uint) sizeof(HP_INFO) +
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2 * share->max_key_length,
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MYF(MY_ZEROFILL))))
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{
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DBUG_RETURN(0);
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}
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share->open_count++;
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#ifdef THREAD
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thr_lock_data_init(&share->lock,&info->lock,NULL);
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#endif
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info->s= share;
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info->lastkey= (uchar*) (info + 1);
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info->recbuf= (uchar*) (info->lastkey + share->max_key_length);
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info->mode= mode;
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info->current_record= (ulong) ~0L; /* No current record */
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info->lastinx= info->errkey= -1;
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#ifndef DBUG_OFF
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info->opt_flag= READ_CHECK_USED; /* Check when changing */
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#endif
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DBUG_PRINT("exit",("heap: 0x%lx reclength: %d records_in_block: %d",
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(long) info, share->reclength,
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share->block.records_in_block));
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DBUG_RETURN(info);
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}
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/*
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Open heap table based on HP_SHARE structure and register it
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*/
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HP_INFO *heap_open_from_share_and_register(HP_SHARE *share, int mode)
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{
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HP_INFO *info;
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DBUG_ENTER("heap_open_from_share_and_register");
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pthread_mutex_lock(&THR_LOCK_heap);
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if ((info= heap_open_from_share(share, mode)))
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{
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info->open_list.data= (void*) info;
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heap_open_list= list_add(heap_open_list,&info->open_list);
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}
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pthread_mutex_unlock(&THR_LOCK_heap);
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DBUG_RETURN(info);
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}
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/*
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Open heap table based on name
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NOTE
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This register the table in the open table list. so that it can be
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found by future heap_open() calls.
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*/
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HP_INFO *heap_open(const char *name, int mode)
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{
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HP_INFO *info;
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HP_SHARE *share;
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DBUG_ENTER("heap_open");
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pthread_mutex_lock(&THR_LOCK_heap);
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if (!(share= hp_find_named_heap(name)))
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{
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my_errno= ENOENT;
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pthread_mutex_unlock(&THR_LOCK_heap);
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DBUG_RETURN(0);
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}
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if ((info= heap_open_from_share(share, mode)))
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{
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info->open_list.data= (void*) info;
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heap_open_list= list_add(heap_open_list,&info->open_list);
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}
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pthread_mutex_unlock(&THR_LOCK_heap);
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DBUG_RETURN(info);
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}
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/* map name to a heap-nr. If name isn't found return 0 */
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HP_SHARE *hp_find_named_heap(const char *name)
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{
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LIST *pos;
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HP_SHARE *info;
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DBUG_ENTER("heap_find");
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DBUG_PRINT("enter",("name: %s",name));
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for (pos= heap_share_list; pos; pos= pos->next)
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{
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info= (HP_SHARE*) pos->data;
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if (!strcmp(name, info->name))
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{
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DBUG_PRINT("exit", ("Old heap_database: 0x%lx", (long) info));
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DBUG_RETURN(info);
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}
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}
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DBUG_RETURN((HP_SHARE *) 0);
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}
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