114 lines
4.3 KiB
C
114 lines
4.3 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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* $Id$
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*
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* sets the given reference to dat
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**********************************************/
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#include <lladd/operations/prepare.h>
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#include "../logger/logWriter.h"
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#include <malloc.h>
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#include <assert.h>
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recordid prepare_bogus_rec = { 0, 0, 0};
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static int operate(int xid, Page * p, lsn_t lsn, recordid rid, const void *dat) {
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syncLog();
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return 0;
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}
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Operation getPrepare() {
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Operation o = {
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OPERATION_PREPARE, /* id */
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0, /* No extra data. */
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OPERATION_NOOP,
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&operate /* Function */
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};
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return o;
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}
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/** PrepareGuardState is 1 if the iterator should continue on the next
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(previous) log entry, 0 otherwise. */
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typedef struct{
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int continueIterating;
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int prevLSN;
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int xid;
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} PrepareGuardState;
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void * getPrepareGuardState() {
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PrepareGuardState * s = malloc (sizeof(PrepareGuardState));
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s->continueIterating = 1;
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s->prevLSN = -1;
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s->xid = -1;
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return s;
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}
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int prepareGuard(LogEntry * e, void * state) {
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PrepareGuardState * pgs = state;
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int ret = pgs->continueIterating;
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if(e->type == UPDATELOG) {
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if(e->contents.update.funcID == OPERATION_PREPARE) {
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pgs->continueIterating = 0;
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pgs->prevLSN = e->prevLSN;
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}
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}
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if(pgs->xid == -1) {
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pgs->xid = e->xid;
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} else {
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assert(pgs->xid == e->xid);
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}
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return ret;
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}
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/** @todo When fleshing out the logHandle's prepareAction interface, figure out what the return value should mean... */
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int prepareAction(
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void * state) {
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PrepareGuardState * pgs = state;
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if(!pgs->continueIterating) {
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assert(pgs->prevLSN != -1);
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Trevive(pgs->xid, pgs->prevLSN);
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}
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return 0;
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}
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