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Diffstat (limited to 'storage/maria/tablockman.h')
| -rw-r--r-- | storage/maria/tablockman.h | 87 |
1 files changed, 87 insertions, 0 deletions
diff --git a/storage/maria/tablockman.h b/storage/maria/tablockman.h new file mode 100644 index 00000000..fd756fae --- /dev/null +++ b/storage/maria/tablockman.h @@ -0,0 +1,87 @@ +/* Copyright (C) 2006 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1335 USA */ + +#ifndef _tablockman_h +#define _tablockman_h + +/* + Lock levels: + ^^^^^^^^^^^ + + N - "no lock", not a lock, used sometimes internally to simplify the code + S - Shared + X - eXclusive + IS - Intention Shared + IX - Intention eXclusive + SIX - Shared + Intention eXclusive + LS - Loose Shared + LX - Loose eXclusive + SLX - Shared + Loose eXclusive + LSIX - Loose Shared + Intention eXclusive +*/ +#ifndef _lockman_h +/* QQ: TODO remove N-locks */ +enum lockman_lock_type { N, S, X, IS, IX, SIX, LS, LX, SLX, LSIX, LOCK_TYPE_LAST }; +enum lockman_getlock_result { + NO_MEMORY_FOR_LOCK=1, DEADLOCK, LOCK_TIMEOUT, + GOT_THE_LOCK, + GOT_THE_LOCK_NEED_TO_LOCK_A_SUBRESOURCE, + GOT_THE_LOCK_NEED_TO_INSTANT_LOCK_A_SUBRESOURCE +}; +#endif + +#define LOCK_TYPES (LOCK_TYPE_LAST-1) + +typedef struct st_table_lock TABLE_LOCK; + +typedef struct st_table_lock_owner { + TABLE_LOCK *active_locks; /* list of active locks */ + TABLE_LOCK *waiting_lock; /* waiting lock (one lock only) */ + struct st_table_lock_owner *waiting_for; /* transaction we're waiting for */ + pthread_cond_t *cond; /* transactions waiting for us, wait on 'cond' */ + mysql_mutex_t *mutex; /* mutex is required to use 'cond' */ + uint16 loid, waiting_for_loid; /* Lock Owner IDentifier */ +} TABLE_LOCK_OWNER; + +typedef struct st_locked_table { + mysql_mutex_t mutex; /* mutex for everything below */ + HASH latest_locks; /* latest locks in a hash */ + TABLE_LOCK *active_locks[LOCK_TYPES]; /* dl-list of locks per type */ + TABLE_LOCK *wait_queue_in, *wait_queue_out; /* wait deque (double-end queue)*/ +} LOCKED_TABLE; + +typedef TABLE_LOCK_OWNER *loid_to_tlo_func(uint16); + +typedef struct { + mysql_mutex_t pool_mutex; + TABLE_LOCK *pool; /* lifo pool of free locks */ + uint lock_timeout; /* lock timeout in milliseconds */ + loid_to_tlo_func *loid_to_tlo; /* for mapping loid to TABLE_LOCK_OWNER */ +} TABLOCKMAN; + +void tablockman_init(TABLOCKMAN *, loid_to_tlo_func *, uint); +void tablockman_destroy(TABLOCKMAN *); +enum lockman_getlock_result tablockman_getlock(TABLOCKMAN *, TABLE_LOCK_OWNER *, + LOCKED_TABLE *, enum lockman_lock_type); +void tablockman_release_locks(TABLOCKMAN *, TABLE_LOCK_OWNER *); +void tablockman_init_locked_table(LOCKED_TABLE *, int); +void tablockman_destroy_locked_table(LOCKED_TABLE *); + +#ifdef EXTRA_DEBUG +void tablockman_print_tlo(TABLE_LOCK_OWNER *); +#endif + +#endif + |