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A few more comment changes. No code alterations. (CVS 1689)

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FossilOrigin-Name: b68b4a4262c2ab60f9a7cc0c206b9db207f86933
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danielk1977
2004-06-25 08:32:25 +00:00
parent f42f25c2c5
commit 90ba3bd065
5 changed files with 48 additions and 25 deletions
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14
src/pager.c
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@@ -18,7 +18,7 @@
** file simultaneously, or one process from reading the database while
** another is writing.
**
** @(#) $Id: pager.c,v 1.140 2004/06/25 07:21:28 danielk1977 Exp $
** @(#) $Id: pager.c,v 1.141 2004/06/25 08:32:26 danielk1977 Exp $
*/
#include "os.h" /* Must be first to enable large file support */
#include "sqliteInt.h"
@@ -1952,7 +1952,17 @@ int sqlite3pager_get(Pager *pPager, Pgno pgno, void **ppPage){
){
int rc;
/* Get an EXCLUSIVE lock on the database file. */
/* Get an EXCLUSIVE lock on the database file. At this point it is
** important that a RESERVED lock is not obtained on the way to the
** EXCLUSIVE lock. If it were, another process might open the
** database file, detect the RESERVED lock, and conclude that the
** database is safe to read while this process is still rolling it
** back.
**
** Because the intermediate RESERVED lock is not requested, the
** second process will get to this point in the code and fail to
** obtain it's own EXCLUSIVE lock on the database file.
*/
rc = sqlite3OsLock(&pPager->fd, EXCLUSIVE_LOCK);
if( rc!=SQLITE_OK ){
sqlite3OsUnlock(&pPager->fd, NO_LOCK);