mirror of
https://github.com/MariaDB/server.git
synced 2025-01-19 05:22:25 +01:00
107 lines
3.2 KiB
C
107 lines
3.2 KiB
C
/* Copyright (C) 2000 MySQL AB & MySQL Finland AB & TCX DataKonsult AB
|
|
|
|
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; either version 2 of the License, or
|
|
(at your option) any later version.
|
|
|
|
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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */
|
|
|
|
/*
|
|
Key cache assignments
|
|
*/
|
|
|
|
#include "myisamdef.h"
|
|
|
|
|
|
/*
|
|
Assign pages of the index file for a table to a key cache
|
|
|
|
SYNOPSIS
|
|
mi_assign_to_keycache()
|
|
info open table
|
|
map map of indexes to assign to the key cache
|
|
key_cache_ptr pointer to the key cache handle
|
|
|
|
RETURN VALUE
|
|
0 if a success. error code - otherwise.
|
|
|
|
NOTES.
|
|
At present pages for all indexes must be assigned to the same key cache.
|
|
In future only pages for indexes specified in the key_map parameter
|
|
of the table will be assigned to the specified key cache.
|
|
*/
|
|
|
|
typedef struct st_assign_extra_info
|
|
{
|
|
pthread_mutex_t *lock;
|
|
struct st_my_thread_var *waiting_thread;
|
|
} ASSIGN_EXTRA_INFO;
|
|
|
|
static void remove_key_cache_assign(void *arg)
|
|
{
|
|
KEY_CACHE_VAR *key_cache= (KEY_CACHE_VAR *) arg;
|
|
ASSIGN_EXTRA_INFO *extra_info= (ASSIGN_EXTRA_INFO *) key_cache->extra_info;
|
|
struct st_my_thread_var *waiting_thread;
|
|
pthread_mutex_t *lock= extra_info->lock;
|
|
pthread_mutex_lock(lock);
|
|
if (!(--key_cache->assignments) &&
|
|
(waiting_thread = extra_info->waiting_thread))
|
|
{
|
|
my_free(extra_info, MYF(0));
|
|
key_cache->extra_info= 0;
|
|
if (waiting_thread != my_thread_var)
|
|
pthread_cond_signal(&waiting_thread->suspend);
|
|
}
|
|
pthread_mutex_unlock(lock);
|
|
}
|
|
|
|
int mi_assign_to_keycache(MI_INFO *info, ulonglong key_map,
|
|
KEY_CACHE_VAR *key_cache,
|
|
pthread_mutex_t *assign_lock)
|
|
{
|
|
ASSIGN_EXTRA_INFO *extra_info;
|
|
int error= 0;
|
|
MYISAM_SHARE* share= info->s;
|
|
|
|
DBUG_ENTER("mi_assign_to_keycache");
|
|
|
|
share->reg_keycache= &key_cache->cache;
|
|
pthread_mutex_lock(assign_lock);
|
|
if (!(extra_info= (ASSIGN_EXTRA_INFO *) key_cache->extra_info))
|
|
{
|
|
if (!(extra_info= (ASSIGN_EXTRA_INFO*) my_malloc(sizeof(ASSIGN_EXTRA_INFO),
|
|
MYF(MY_WME | MY_ZEROFILL))))
|
|
DBUG_RETURN(HA_ERR_OUT_OF_MEM);
|
|
key_cache->extra_info= extra_info;
|
|
key_cache->action= remove_key_cache_assign;
|
|
extra_info->lock= assign_lock;
|
|
}
|
|
key_cache->assignments++;
|
|
pthread_mutex_unlock(assign_lock);
|
|
|
|
if (!(info->lock_type == F_WRLCK && share->w_locks))
|
|
{
|
|
if (flush_key_blocks(*share->keycache, share->kfile, FLUSH_REMOVE))
|
|
{
|
|
error=my_errno;
|
|
mi_mark_crashed(info); /* Mark that table must be checked */
|
|
}
|
|
share->keycache= &key_cache->cache;
|
|
}
|
|
else
|
|
{
|
|
extra_info->waiting_thread= my_thread_var;
|
|
}
|
|
|
|
|
|
DBUG_RETURN(error);
|
|
}
|
|
|