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DarkSide SQL Mini Version 1, The embedded database

, 23 Mar 2006
An embedded database library in C++.
/*-
 * See the file LICENSE for redistribution information.
 *
 * Copyright (c) 1996-2002
 *	Sleepycat Software.  All rights reserved.
 *
 * $Id: db_am.h,v 11.61 2002/08/08 03:20:46 bostic Exp $
 */
#ifndef _DB_AM_H_
#define	_DB_AM_H_

/*
 * IS_AUTO_COMMIT --
 *	Test for local auto-commit flag or global flag with no local DbTxn
 *	handle.
 */
#define	IS_AUTO_COMMIT(dbenv, txn, flags)				\
	(LF_ISSET(DB_AUTO_COMMIT) ||					\
	    ((txn) == NULL && F_ISSET((dbenv), DB_ENV_AUTO_COMMIT)))

/* DB recovery operation codes. */
#define	DB_ADD_DUP	1
#define	DB_REM_DUP	2
#define	DB_ADD_BIG	3
#define	DB_REM_BIG	4
#define	DB_ADD_PAGE	5
#define	DB_REM_PAGE	6

/*
 * Standard initialization and shutdown macros for all recovery functions.
 */
#define	REC_INTRO(func, inc_count) {					\
	argp = NULL;							\
	dbc = NULL;							\
	file_dbp = NULL;						\
	mpf = NULL;							\
	if ((ret = func(dbenv, dbtp->data, &argp)) != 0)		\
		goto out;						\
	if ((ret = __dbreg_id_to_db(dbenv, argp->txnid,		\
	    &file_dbp, argp->fileid, inc_count)) != 0) {		\
		if (ret	== DB_DELETED) {				\
			ret = 0;					\
			goto done;					\
		}							\
		goto out;						\
	}								\
	if ((ret = file_dbp->cursor(file_dbp, NULL, &dbc, 0)) != 0)	\
		goto out;						\
	F_SET(dbc, DBC_RECOVER);					\
	mpf = file_dbp->mpf;						\
}

#define	REC_CLOSE {							\
	int __t_ret;							\
	if (argp != NULL)						\
		__os_free(dbenv, argp);					\
	if (dbc != NULL &&						\
	    (__t_ret = dbc->c_close(dbc)) != 0 && ret == 0)		\
		ret = __t_ret;						\
	return (ret);							\
}

/*
 * No-op versions of the same macros.
 */
#define	REC_NOOP_INTRO(func) {						\
	argp = NULL;							\
	if ((ret = func(dbenv, dbtp->data, &argp)) != 0)		\
		return (ret);						\
}
#define	REC_NOOP_CLOSE							\
	if (argp != NULL)						\
		__os_free(dbenv, argp);					\
	return (ret);							\

/*
 * Standard debugging macro for all recovery functions.
 */
#ifdef DEBUG_RECOVER
#define	REC_PRINT(func)							\
	(void)func(dbenv, dbtp, lsnp, op, info);
#else
#define	REC_PRINT(func)
#endif

/*
 * Actions to __db_lget
 */
#define	LCK_ALWAYS		1	/* Lock even for off page dup cursors */
#define	LCK_COUPLE		2	/* Lock Couple */
#define	LCK_COUPLE_ALWAYS	3	/* Lock Couple even in txn. */
#define	LCK_DOWNGRADE		4	/* Downgrade the lock. (internal) */
#define	LCK_ROLLBACK		5	/* Lock even if in rollback */

/*
 * If doing transactions we have to hold the locks associated with a data item
 * from a page for the entire transaction.  However, we don't have to hold the
 * locks associated with walking the tree.  Distinguish between the two so that
 * we don't tie up the internal pages of the tree longer than necessary.
 */
#define	__LPUT(dbc, lock)						\
	(LOCK_ISSET(lock) ?						\
	(dbc)->dbp->dbenv->lock_put((dbc)->dbp->dbenv, &(lock)) : 0)

/*
 * __TLPUT -- transactional lock put
 *	If the lock is valid then
 *	   If we are not in a transaction put the lock.
 *	   Else if the cursor is doing dirty reads and this was a read then
 *		put the lock.
 *	   Else if the db is supporting dirty reads and this is a write then
 *		downgrade it.
 *	Else do nothing.
 */
#define	__TLPUT(dbc, lock)						\
	(LOCK_ISSET(lock) ? __db_lput(dbc, &(lock)) : 0)

typedef struct {
	DBC *dbc;
	int count;
} db_trunc_param;

#include "dbinc/db_dispatch.h"
#include "dbinc_auto/db_auto.h"
#include "dbinc_auto/crdel_auto.h"
#include "dbinc_auto/db_ext.h"
#endif /* !_DB_AM_H_ */

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This article, along with any associated source code and files, is licensed under The BSD License

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