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17b4f99928
This commit is based on the work of Michal Schorm, rebased on the
earliest MariaDB version.
Th command line used to generate this diff was:
find ./ -type f \
-exec sed -i -e 's/Foundation, Inc., 59 Temple Place, Suite 330, Boston, /Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, /g' {} \; \
-exec sed -i -e 's/Foundation, Inc. 59 Temple Place.* Suite 330, Boston, /Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, /g' {} \; \
-exec sed -i -e 's/MA.*.....-1307.*USA/MA 02110-1335 USA/g' {} \; \
-exec sed -i -e 's/Foundation, Inc., 59 Temple/Foundation, Inc., 51 Franklin/g' {} \; \
-exec sed -i -e 's/Place, Suite 330, Boston, MA.*02111-1307.*USA/Street, Fifth Floor, Boston, MA 02110-1335 USA/g' {} \; \
-exec sed -i -e 's/MA.*.....-1307/MA 02110-1335/g' {} \;
87 lines
3.2 KiB
C
87 lines
3.2 KiB
C
/* Copyright (C) 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1335 USA */
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#ifndef _tablockman_h
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#define _tablockman_h
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/*
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Lock levels:
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^^^^^^^^^^^
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N - "no lock", not a lock, used sometimes internally to simplify the code
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S - Shared
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X - eXclusive
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IS - Intention Shared
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IX - Intention eXclusive
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SIX - Shared + Intention eXclusive
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LS - Loose Shared
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LX - Loose eXclusive
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SLX - Shared + Loose eXclusive
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LSIX - Loose Shared + Intention eXclusive
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*/
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#ifndef _lockman_h
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/* QQ: TODO remove N-locks */
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enum lockman_lock_type { N, S, X, IS, IX, SIX, LS, LX, SLX, LSIX, LOCK_TYPE_LAST };
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enum lockman_getlock_result {
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NO_MEMORY_FOR_LOCK=1, DEADLOCK, LOCK_TIMEOUT,
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GOT_THE_LOCK,
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GOT_THE_LOCK_NEED_TO_LOCK_A_SUBRESOURCE,
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GOT_THE_LOCK_NEED_TO_INSTANT_LOCK_A_SUBRESOURCE
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};
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#endif
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#define LOCK_TYPES (LOCK_TYPE_LAST-1)
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typedef struct st_table_lock TABLE_LOCK;
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typedef struct st_table_lock_owner {
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TABLE_LOCK *active_locks; /* list of active locks */
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TABLE_LOCK *waiting_lock; /* waiting lock (one lock only) */
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struct st_table_lock_owner *waiting_for; /* transaction we're waiting for */
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pthread_cond_t *cond; /* transactions waiting for us, wait on 'cond' */
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mysql_mutex_t *mutex; /* mutex is required to use 'cond' */
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uint16 loid, waiting_for_loid; /* Lock Owner IDentifier */
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} TABLE_LOCK_OWNER;
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typedef struct st_locked_table {
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mysql_mutex_t mutex; /* mutex for everything below */
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HASH latest_locks; /* latest locks in a hash */
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TABLE_LOCK *active_locks[LOCK_TYPES]; /* dl-list of locks per type */
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TABLE_LOCK *wait_queue_in, *wait_queue_out; /* wait deque (double-end queue)*/
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} LOCKED_TABLE;
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typedef TABLE_LOCK_OWNER *loid_to_tlo_func(uint16);
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typedef struct {
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mysql_mutex_t pool_mutex;
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TABLE_LOCK *pool; /* lifo pool of free locks */
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uint lock_timeout; /* lock timeout in milliseconds */
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loid_to_tlo_func *loid_to_tlo; /* for mapping loid to TABLE_LOCK_OWNER */
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} TABLOCKMAN;
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void tablockman_init(TABLOCKMAN *, loid_to_tlo_func *, uint);
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void tablockman_destroy(TABLOCKMAN *);
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enum lockman_getlock_result tablockman_getlock(TABLOCKMAN *, TABLE_LOCK_OWNER *,
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LOCKED_TABLE *, enum lockman_lock_type);
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void tablockman_release_locks(TABLOCKMAN *, TABLE_LOCK_OWNER *);
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void tablockman_init_locked_table(LOCKED_TABLE *, int);
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void tablockman_destroy_locked_table(LOCKED_TABLE *);
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#ifdef EXTRA_DEBUG
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void tablockman_print_tlo(TABLE_LOCK_OWNER *);
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#endif
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#endif
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