128 lines
5.5 KiB
C
128 lines
5.5 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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* Decrements the given reference by one
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*********************************************/
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#include <lladd/transactional.h>
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#include <lladd/common.h>
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#include <lladd/operations/nestedTopActions.h>
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#include <lladd/logger/logger2.h>
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#include <pbl/pbl.h>
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#include <string.h>
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#include <stdlib.h>
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#include <pthread.h>
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#include <assert.h>
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/** @todo Remove extern declaration of transactional_2_mutex from nestedTopActions.c */
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extern pthread_mutex_t transactional_2_mutex;
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/*#include <lladd/bufferManager.h>*/
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extern TransactionLog XactionTable[];
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pblHashTable_t * nestedTopActions = NULL;
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/** @todo this really should be set somewhere globally. */
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void initNestedTopActions() {
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nestedTopActions = pblHtCreate();
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}
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/** @todo TbeginNestedTopAction's API might not be quite right.
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Are there cases where we need to pass a recordid in?
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@return a handle that must be passed into TendNestedTopAction
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*/
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void * TbeginNestedTopAction(int xid, int op, const byte * dat, int datSize) {
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recordid rid = NULLRID;
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rid.page = datSize;
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LogEntry * e = LogUpdate(&XactionTable[xid % MAX_TRANSACTIONS], NULL, rid, op, dat);
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DEBUG("Begin Nested Top Action e->LSN: %ld\n", e->LSN);
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lsn_t * prevLSN = malloc(sizeof(lsn_t));
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*prevLSN = e->LSN;
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pthread_mutex_lock(&transactional_2_mutex);
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void * ret = pblHtLookup(nestedTopActions, &xid, sizeof(int));
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if(ret) {
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pblHtRemove(nestedTopActions, &xid, sizeof(int));
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}
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pblHtInsert(nestedTopActions, &xid, sizeof(int), prevLSN);
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pthread_mutex_unlock(&transactional_2_mutex);
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FreeLogEntry(e);
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return ret;
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}
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/**
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Call this function at the end of a nested top action.
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@return the lsn of the CLR. Most users (everyone?) will ignore this.
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@todo LogCLR()'s API is useless. Make it private, and implement a better
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public version. (Then rewrite TendNestedTopAction)
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*/
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lsn_t TendNestedTopAction(int xid, void * handle) {
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pthread_mutex_lock(&transactional_2_mutex);
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lsn_t * prevLSN = pblHtLookup(nestedTopActions, &xid, sizeof(int));
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pblHtRemove(nestedTopActions, &xid, sizeof(int));
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if(handle) {
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pblHtInsert(nestedTopActions, &xid, sizeof(int), handle);
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}
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// This action wasn't really undone -- This is a nested top action!
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lsn_t undoneLSN = XactionTable[xid % MAX_TRANSACTIONS].prevLSN;
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recordid undoneRID = NULLRID; // Not correct, but this field is unused anyway. ;)
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// Write a CLR.
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lsn_t clrLSN = LogCLR(xid, undoneLSN, undoneRID, *prevLSN);
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// Ensure that the next action in this transaction points to the CLR.
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XactionTable[xid % MAX_TRANSACTIONS].prevLSN = clrLSN;
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DEBUG("NestedTopAction CLR %d, LSN: %ld type: %ld (undoing: %ld, next to undo: %ld)\n", e->xid,
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clrLSN, undoneLSN, *prevLSN);
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free(prevLSN);
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pthread_mutex_unlock(&transactional_2_mutex);
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return clrLSN;
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}
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