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76 lines
2.6 KiB
C
76 lines
2.6 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */
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#ifndef _lockman_h
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#define _lockman_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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enum lockman_lock_type { N, S, X, IS, IX, SIX, LS, LX, SLX, LSIX, LOCK_TYPE_LAST };
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struct lockman_lock;
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typedef struct st_lock_owner LOCK_OWNER;
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struct st_lock_owner {
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LF_PINS *pins; /* must be allocated from lockman's pinbox */
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struct lockman_lock *all_locks; /* a LIFO */
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LOCK_OWNER *waiting_for;
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pthread_cond_t *cond; /* transactions waiting for this, wait on 'cond' */
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pthread_mutex_t *mutex; /* mutex is required to use 'cond' */
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uint16 loid;
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};
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typedef LOCK_OWNER *loid_to_lo_func(uint16);
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typedef struct {
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LF_DYNARRAY array; /* hash itself */
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LF_ALLOCATOR alloc; /* allocator for elements */
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int32 volatile size; /* size of array */
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int32 volatile count; /* number of elements in the hash */
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uint lock_timeout;
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loid_to_lo_func *loid_to_lo;
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} LOCKMAN;
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#define DIDNT_GET_THE_LOCK 0
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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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void lockman_init(LOCKMAN *, loid_to_lo_func *, uint);
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void lockman_destroy(LOCKMAN *);
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enum lockman_getlock_result lockman_getlock(LOCKMAN *lm, LOCK_OWNER *lo,
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uint64 resource,
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enum lockman_lock_type lock);
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int lockman_release_locks(LOCKMAN *, LOCK_OWNER *);
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#ifdef EXTRA_DEBUG
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void print_lockhash(LOCKMAN *lm);
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#endif
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#endif
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