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Viewing changes to storage/innobase/lock/lock0lock.c

  • Committer: Brian Aker
  • Date: 2009-03-17 04:26:36 UTC
  • mfrom: (933.1.4 innodb-plugin-merge)
  • Revision ID: brian@tangent.org-20090317042636-oyd238h2u2bqhfy1
Merging new Innodb

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storage/innobase/lock/lock0lock.c
 
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/*****************************************************************************
 
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Copyright (c) 1996, 2009, Innobase Oy. All Rights Reserved.
 
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This program is free software; you can redistribute it and/or modify it under
 
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the terms of the GNU General Public License as published by the Free Software
 
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Foundation; version 2 of the License.
 
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This program is distributed in the hope that it will be useful, but WITHOUT
 
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ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
 
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FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
 
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You should have received a copy of the GNU General Public License along with
 
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this program; if not, write to the Free Software Foundation, Inc., 59 Temple
 
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Place, Suite 330, Boston, MA 02111-1307 USA
 
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*****************************************************************************/
 
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/******************************************************
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The transaction lock system
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(c) 1996 Innobase Oy
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Created 5/7/1996 Heikki Tuuri
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*******************************************************/
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        const lock_t*   lock;
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        ibool           ok      = FALSE;
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        ut_ad(table && trx);
 
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        ut_ad(table);
 
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        ut_ad(trx);
 
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        lock_mutex_enter_kernel();
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        for (lock = UT_LIST_GET_FIRST(table->locks);
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             lock;
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                if (lock->trx != trx) {
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                        /* A lock on the table is held
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                        by some other transaction. */
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                        return(FALSE);
 
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                        goto not_ok;
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                }
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                if (!(lock_get_type_low(lock) & LOCK_TABLE)) {
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                        auto_increment lock. */
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                        break;
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                default:
 
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not_ok:
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                        /* Other table locks than LOCK_IX are not allowed. */
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                        return(FALSE);
 
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                        ok = FALSE;
 
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                        goto func_exit;
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                }
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        }
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func_exit:
 
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        lock_mutex_exit_kernel();
 
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        return(ok);
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}
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        dict_table_t*   table;
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        lock_t*         lock;
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        ut_ad(mutex_own(&kernel_mutex));
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        ut_ad(lock_get_wait(wait_lock));
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        table = wait_lock->un_member.tab_lock.table;