104 lines
3.9 KiB
C
104 lines
3.9 KiB
C
/*---
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This software is copyrighted by the Regents of the University of
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California, and other parties. The following terms apply to all files
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associated with the software unless explicitly disclaimed in
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individual files.
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The authors hereby grant permission to use, copy, modify, distribute,
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and license this software and its documentation for any purpose,
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provided that existing copyright notices are retained in all copies
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and that this notice is included verbatim in any distributions. No
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written agreement, license, or royalty fee is required for any of the
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authorized uses. Modifications to this software may be copyrighted by
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their authors and need not follow the licensing terms described here,
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provided that the new terms are clearly indicated on the first page of
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each file where they apply.
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IN NO EVENT SHALL THE AUTHORS OR DISTRIBUTORS BE LIABLE TO ANY PARTY
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FOR DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
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ARISING OUT OF THE USE OF THIS SOFTWARE, ITS DOCUMENTATION, OR ANY
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DERIVATIVES THEREOF, EVEN IF THE AUTHORS HAVE BEEN ADVISED OF THE
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POSSIBILITY OF SUCH DAMAGE.
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THE AUTHORS AND DISTRIBUTORS SPECIFICALLY DISCLAIM ANY WARRANTIES,
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INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, AND
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NON-INFRINGEMENT. THIS SOFTWARE IS PROVIDED ON AN "AS IS" BASIS, AND
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THE AUTHORS AND DISTRIBUTORS HAVE NO OBLIGATION TO PROVIDE
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MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
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GOVERNMENT USE: If you are acquiring this software on behalf of the
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U.S. government, the Government shall have only "Restricted Rights" in
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the software and related documentation as defined in the Federal
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Acquisition Regulations (FARs) in Clause 52.227.19 (c) (2). If you are
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acquiring the software on behalf of the Department of Defense, the
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software shall be classified as "Commercial Computer Software" and the
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Government shall have only "Restricted Rights" as defined in Clause
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252.227-7013 (c) (1) of DFARs. Notwithstanding the foregoing, the
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authors grant the U.S. Government and others acting in its behalf
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permission to use and distribute the software in accordance with the
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terms specified in this license.
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---*/
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/**
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* @file
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* Prepare pseudo-operation
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*
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* Tprepare() uses the operation interface to abstract away log handling.
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* It would be nice if the logger API could be simplified by having
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* more of its functionality handled this way.
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*
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Implementation notes:
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- Just a Tupdate, with a log flush as its operationsTable[]
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function.
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- After recovery, all of the xacts pages will have been 'stolen',
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(if recovery flushes dirty pages)
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- Recovery function needs to distinguish between actions before and
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after the last Tprepare log entry. This is handle by a guard on
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the logHandle's iterator, but could be generalized in the future
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(to support savepoints, for example) Right now, recovery uses a
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guarded iterator, transUndo() does not.
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@todo Test Tprepare()
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*
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* @ingroup OPERATIONS
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*
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* $Id$
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*
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*
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*/
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#ifndef __PREPARE_H__
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#define __PREPARE_H__
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#include <lladd/operations.h>
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#include <lladd/logger/logEntry.h>
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extern recordid prepare_bogus_rec;
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/**
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Prepare transaction for commit. Currently, a transaction may be
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prepared multiple times. Once Tprepare() returns, the caller is
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guaranteed that the current transaction will resume exactly where
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it was when Tprepare() was called.
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@todo Tprepare() shouldn't take a record or buffer as arguments...
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@param xid Transaction id.
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@param rec must be a valid record id. any valid recordid will do. This parameter will be removed eventually.
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@param dat unused.
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*/
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#define Tprepare(xid, rec) Tupdate(xid, rec, 0, OPERATION_PREPARE)
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Operation getPrepare();
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/**
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Recovery's undo phase uses this logHandle iterator guard to implement Tprepare().
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*/
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int prepareGuard(LogEntry * e, void * state);
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void * getPrepareGuardState();
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int prepareAction(void * state);
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#endif
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