186 lines
5.4 KiB
C
186 lines
5.4 KiB
C
/*---
|
|
This software is copyrighted by the Regents of the University of
|
|
California, and other parties. The following terms apply to all files
|
|
associated with the software unless explicitly disclaimed in
|
|
individual files.
|
|
|
|
The authors hereby grant permission to use, copy, modify, distribute,
|
|
and license this software and its documentation for any purpose,
|
|
provided that existing copyright notices are retained in all copies
|
|
and that this notice is included verbatim in any distributions. No
|
|
written agreement, license, or royalty fee is required for any of the
|
|
authorized uses. Modifications to this software may be copyrighted by
|
|
their authors and need not follow the licensing terms described here,
|
|
provided that the new terms are clearly indicated on the first page of
|
|
each file where they apply.
|
|
|
|
IN NO EVENT SHALL THE AUTHORS OR DISTRIBUTORS BE LIABLE TO ANY PARTY
|
|
FOR DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
|
|
ARISING OUT OF THE USE OF THIS SOFTWARE, ITS DOCUMENTATION, OR ANY
|
|
DERIVATIVES THEREOF, EVEN IF THE AUTHORS HAVE BEEN ADVISED OF THE
|
|
POSSIBILITY OF SUCH DAMAGE.
|
|
|
|
THE AUTHORS AND DISTRIBUTORS SPECIFICALLY DISCLAIM ANY WARRANTIES,
|
|
INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
|
|
MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, AND
|
|
NON-INFRINGEMENT. THIS SOFTWARE IS PROVIDED ON AN "AS IS" BASIS, AND
|
|
THE AUTHORS AND DISTRIBUTORS HAVE NO OBLIGATION TO PROVIDE
|
|
MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
|
|
|
|
GOVERNMENT USE: If you are acquiring this software on behalf of the
|
|
U.S. government, the Government shall have only "Restricted Rights" in
|
|
the software and related documentation as defined in the Federal
|
|
Acquisition Regulations (FARs) in Clause 52.227.19 (c) (2). If you are
|
|
acquiring the software on behalf of the Department of Defense, the
|
|
software shall be classified as "Commercial Computer Software" and the
|
|
Government shall have only "Restricted Rights" as defined in Clause
|
|
252.227-7013 (c) (1) of DFARs. Notwithstanding the foregoing, the
|
|
authors grant the U.S. Government and others acting in its behalf
|
|
permission to use and distribute the software in accordance with the
|
|
terms specified in this license.
|
|
---*/
|
|
|
|
/**
|
|
* @defgroup LLADD_CORE Core API
|
|
*
|
|
* The minimal subset of LLADD necessary to implement transactional consistency.
|
|
*
|
|
* This module includes the standard API (excluding operations), the logger, the buffer mananger, and recovery code.
|
|
*
|
|
*/
|
|
/**
|
|
* @defgroup OPERATIONS Logical Operations
|
|
*
|
|
* Implementations of logical operations, and the interfaces that allow new operations to be added.
|
|
*
|
|
* @todo Write a brief howto to explain the implementation of new operations.
|
|
*
|
|
*/
|
|
|
|
/**
|
|
* @file
|
|
*
|
|
* Defines LLADD's primary interface.
|
|
*
|
|
*
|
|
*
|
|
* @todo error handling
|
|
*
|
|
* @ingroup LLADD_CORE
|
|
* $Id$
|
|
*/
|
|
|
|
|
|
|
|
|
|
#ifndef __TRANSACTIONAL_H__
|
|
#define __TRANSACTIONAL_H__
|
|
|
|
#include "common.h"
|
|
|
|
BEGIN_C_DECLS
|
|
|
|
#include "page.h"
|
|
#include "operations.h"
|
|
|
|
/**
|
|
* Currently, LLADD has a fixed number of transactions that may be
|
|
* active at one time.
|
|
*/
|
|
#define EXCEED_MAX_TRANSACTIONS 1
|
|
|
|
/**
|
|
* @param xid transaction ID
|
|
* @param LSN last log that this transaction used
|
|
*/
|
|
/* @param status @ todo Undocumented. (Unused?)
|
|
*/
|
|
typedef struct {
|
|
int xid;
|
|
long LSN;
|
|
/* int status; */
|
|
} Transaction;
|
|
|
|
/**
|
|
* initialize the transactional system, including running recover (if
|
|
* necessary), building the operations_table, and opening the logs
|
|
* @return 0 on success
|
|
* @throws error code on error
|
|
*/
|
|
int Tinit();
|
|
|
|
/**
|
|
* @return positive transaction ID on success, negative return value on error
|
|
*/
|
|
int Tbegin();
|
|
|
|
/**
|
|
* Used when extending LLADD.
|
|
* Operation implementors should wrap around this function to provide more mnuemonic names.
|
|
*
|
|
* @param xid The current transaction.
|
|
* @param rid The record the operation pertains to. For some logical operations, this will be a dummy record.
|
|
* @param dat Application specific data to be recorded in the log (for undo/redo), and to be passed to the implementation of op.
|
|
* @param op The operation's offset in operationsTable
|
|
*
|
|
* @see operations.h set.h
|
|
*/
|
|
void Tupdate(int xid, recordid rid, const void *dat, int op);
|
|
|
|
/**
|
|
* @param xid transaction ID
|
|
* @param rid reference to page/slot
|
|
* @param dat buffer into which data goes
|
|
*/
|
|
void Tread(int xid, recordid rid, void *dat);
|
|
|
|
/**
|
|
* @param xid transaction ID
|
|
* @return 0 on success
|
|
* @throws error vallue on error
|
|
*/
|
|
int Tcommit(int xid);
|
|
|
|
/**
|
|
* @param xid The current transaction
|
|
* @param size The size, in bytes of the new record you wish to allocate
|
|
* @returns A new recordid. On success, this recordid's size will be
|
|
* the requested size. On failure, its size will be zero.
|
|
*/
|
|
recordid Talloc(int xid, size_t size);
|
|
|
|
/* @function Tabort
|
|
* @param xid transaction ID
|
|
* @return 0 on success, -1 on error.
|
|
*/
|
|
int Tabort(int xid);
|
|
|
|
/**
|
|
* flushes all pages, cleans up log
|
|
* @return 0 on success
|
|
* @throws error value on error
|
|
*/
|
|
int Tdeinit();
|
|
|
|
/**
|
|
* Used by the recovery process.
|
|
* Revives Tprepare'ed transactions.
|
|
*
|
|
* @param xid The xid that is to be revived.
|
|
* @param lsn The lsn of that xid's most recent PREPARE entry in the log.
|
|
*/
|
|
void Trevive(int xid, long lsn);
|
|
|
|
/**
|
|
* Used by the recovery process.
|
|
*
|
|
* Sets the number of active transactions.
|
|
* Should not be used elsewhere.
|
|
*
|
|
* @param xid The new active transaction count.
|
|
*/
|
|
void TsetXIDCount(int xid);
|
|
|
|
END_C_DECLS
|
|
|
|
#endif
|