mirror of
https://github.com/MariaDB/server.git
synced 2025-01-17 12:32:27 +01:00
0cfa3267fb
Implement neccessary shared lock structure for table locks. This is the backport of bug26241 fix. sql/ha_blackhole.cc: Implement neccessary shared lock structure for table locks. sql/ha_blackhole.h: Declare shared structure for table locks sql/handler.cc: added BLACKHOLE_DB case
99 lines
3.4 KiB
C++
99 lines
3.4 KiB
C++
/* Copyright (C) 2005 MySQL 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; 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */
|
|
|
|
#ifdef USE_PRAGMA_INTERFACE
|
|
#pragma interface /* gcc class implementation */
|
|
#endif
|
|
|
|
|
|
/*
|
|
Shared structure for correct LOCK operation
|
|
*/
|
|
struct st_blackhole_share {
|
|
THR_LOCK lock;
|
|
uint use_count;
|
|
uint table_name_length;
|
|
char table_name[1];
|
|
};
|
|
|
|
|
|
/*
|
|
Class definition for the blackhole storage engine
|
|
"Dumbest named feature ever"
|
|
*/
|
|
class ha_blackhole: public handler
|
|
{
|
|
THR_LOCK_DATA lock; /* MySQL lock */
|
|
st_blackhole_share *share;
|
|
|
|
public:
|
|
ha_blackhole(TABLE *table_arg);
|
|
~ha_blackhole()
|
|
{
|
|
}
|
|
/* The name that will be used for display purposes */
|
|
const char *table_type() const { return "BLACKHOLE"; }
|
|
/*
|
|
The name of the index type that will be used for display
|
|
don't implement this method unless you really have indexes
|
|
*/
|
|
const char *index_type(uint key_number);
|
|
const char **bas_ext() const;
|
|
ulong table_flags() const
|
|
{
|
|
return(HA_NULL_IN_KEY | HA_CAN_FULLTEXT | HA_CAN_SQL_HANDLER |
|
|
HA_DUPP_POS | HA_CAN_INDEX_BLOBS | HA_AUTO_PART_KEY |
|
|
HA_FILE_BASED | HA_CAN_GEOMETRY | HA_READ_RND_SAME);
|
|
}
|
|
ulong index_flags(uint inx, uint part, bool all_parts) const
|
|
{
|
|
return ((table->key_info[inx].algorithm == HA_KEY_ALG_FULLTEXT) ?
|
|
0 : HA_READ_NEXT | HA_READ_PREV | HA_READ_RANGE |
|
|
HA_READ_ORDER | HA_KEYREAD_ONLY);
|
|
}
|
|
/* The following defines can be increased if necessary */
|
|
#define BLACKHOLE_MAX_KEY 64 /* Max allowed keys */
|
|
#define BLACKHOLE_MAX_KEY_SEG 16 /* Max segments for key */
|
|
#define BLACKHOLE_MAX_KEY_LENGTH 1000
|
|
uint max_supported_keys() const { return BLACKHOLE_MAX_KEY; }
|
|
uint max_supported_key_length() const { return BLACKHOLE_MAX_KEY_LENGTH; }
|
|
uint max_supported_key_part_length() const { return BLACKHOLE_MAX_KEY_LENGTH; }
|
|
int open(const char *name, int mode, uint test_if_locked);
|
|
int close(void);
|
|
int write_row(byte * buf);
|
|
int rnd_init(bool scan);
|
|
int rnd_next(byte *buf);
|
|
int rnd_pos(byte * buf, byte *pos);
|
|
int index_read(byte * buf, const byte * key,
|
|
uint key_len, enum ha_rkey_function find_flag);
|
|
int index_read_idx(byte * buf, uint idx, const byte * key,
|
|
uint key_len, enum ha_rkey_function find_flag);
|
|
int index_read_last(byte * buf, const byte * key, uint key_len);
|
|
int index_next(byte * buf);
|
|
int index_prev(byte * buf);
|
|
int index_first(byte * buf);
|
|
int index_last(byte * buf);
|
|
void position(const byte *record);
|
|
int info(uint flag);
|
|
int external_lock(THD *thd, int lock_type);
|
|
int create(const char *name, TABLE *table_arg,
|
|
HA_CREATE_INFO *create_info);
|
|
THR_LOCK_DATA **store_lock(THD *thd,
|
|
THR_LOCK_DATA **to,
|
|
enum thr_lock_type lock_type);
|
|
};
|
|
|
|
bool blackhole_db_init(void);
|
|
bool blackhole_db_end(void);
|