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/* 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);
}
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