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Continued work on btree (CVS 219)

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FossilOrigin-Name: 18500cdcc1a42118cdf650681ebb1cbeac106aa7
This commit is contained in:
drh
2001-05-24 21:06:34 +00:00
parent 306dc21379
commit 72f8286960
7 changed files with 372 additions and 80 deletions
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21
src/pager.c
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@@ -27,7 +27,7 @@
** all writes in order to support rollback. Locking is used to limit
** access to one or more reader or one writer.
**
** @(#) $Id: pager.c,v 1.6 2001/05/21 13:45:10 drh Exp $
** @(#) $Id: pager.c,v 1.7 2001/05/24 21:06:36 drh Exp $
*/
#include "sqliteInt.h"
#include "pager.h"
@@ -113,6 +113,7 @@ struct Pager {
int dbSize; /* Number of pages in the file */
int origDbSize; /* dbSize before the current change */
int nExtra; /* Add this many bytes to each in-memory page */
void (*xDestructor)(void*); /* Call this routine when freeing pages */
int nPage; /* Total number of in-memory pages */
int nRef; /* Number of in-memory pages with PgHdr.nRef>0 */
int mxPage; /* Maximum number of pages to hold in cache */
@@ -478,6 +479,17 @@ int sqlitepager_open(
return SQLITE_OK;
}
/*
** Set the destructor for this pager. If not NULL, the destructor is called
** when the reference count on the page reaches zero.
**
** The destructor is not called as a result sqlitepager_close().
** Destructors are only called by sqlitepager_unref().
*/
void sqlitepager_set_destructor(Pager *pPager, void (*xDesc)(void*)){
pPager->xDestructor = xDesc;
}
/*
** Return the total number of pages in the file opened by pPager.
*/
@@ -806,8 +818,8 @@ int sqlitepager_unref(void *pData){
pPager = pPg->pPager;
pPg->nRef--;
/* When the number of references to a page reach 0, add the
** page to the freelist.
/* When the number of references to a page reach 0, call the
** destructor and add the page to the freelist.
*/
if( pPg->nRef==0 ){
pPg->pNextFree = 0;
@@ -818,6 +830,9 @@ int sqlitepager_unref(void *pData){
}else{
pPager->pFirst = pPg;
}
if( pPager->xDestructor ){
pPager->xDestructor(pData);
}
/* When all pages reach the freelist, drop the read lock from
** the database file.