lock manager optimized for table locks

storage/maria/unittest/lockman1-t.c:
  New BitKeeper file ``storage/maria/unittest/lockman1-t.c''
storage/maria/tablockman.c:
  New BitKeeper file ``storage/maria/tablockman.c''
storage/maria/tablockman.h:
  New BitKeeper file ``storage/maria/tablockman.h''
storage/maria/unittest/lockman2-t.c:
  New BitKeeper file ``storage/maria/unittest/lockman2-t.c''

1 files changed, 84 insertions, 0 deletions

diff --git a/storage/maria/tablockman.h b/storage/maria/tablockman.h
new file mode 100644
index 00000000000..4b2d165af54
--- /dev/null
+++ b/storage/maria/tablockman.h
@@ -0,0 +1,84 @@
+/* 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; 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 */
+
+#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
+enum lock_type { N, S, X, IS, IX, SIX, LS, LX, SLX, LSIX };
+enum lockman_getlock_result {
+  DIDNT_GET_THE_LOCK=0, GOT_THE_LOCK,
+  GOT_THE_LOCK_NEED_TO_LOCK_A_SUBRESOURCE,
+  GOT_THE_LOCK_NEED_TO_INSTANT_LOCK_A_SUBRESOURCE
+};
+
+#endif
+
+#define LOCK_TYPES LSIX
+
+typedef struct st_table_lock_owner TABLE_LOCK_OWNER;
+typedef struct st_table_lock TABLE_LOCK;
+typedef struct st_locked_table LOCKED_TABLE;
+typedef TABLE_LOCK_OWNER *loid_to_tlo_func(uint16);
+
+typedef struct {
+  pthread_mutex_t pool_mutex;
+  TABLE_LOCK *pool;
+  uint lock_timeout;
+  loid_to_tlo_func *loid_to_lo;
+} TABLOCKMAN;
+
+struct st_table_lock_owner {
+  TABLE_LOCK *active_locks, *waiting_lock;
+  TABLE_LOCK_OWNER  *waiting_for;
+  pthread_cond_t  *cond;    /* transactions waiting for this, wait on 'cond' */
+  pthread_mutex_t *mutex;   /* mutex is required to use 'cond'               */
+  uint16    loid;
+};
+
+struct st_locked_table {
+  pthread_mutex_t mutex;
+  HASH active;                              // fast to remove
+  TABLE_LOCK *active_locks[LOCK_TYPES];     // fast to see a conflict
+  TABLE_LOCK *wait_queue_in, *wait_queue_out;
+};
+
+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 lock_type lock);
+void tablockman_release_locks(TABLOCKMAN *, TABLE_LOCK_OWNER *);
+void tablockman_init_locked_table(LOCKED_TABLE *);
+void print_tlo(TABLE_LOCK_OWNER *);
+
+#endif
+