php.net |  support |  documentation |  report a bug |  advanced search |  search howto |  statistics |  random bug |  login

go to bug id or search bugs for

Bug #45267 Revisit locking in DBA for DB4
Submitted: 2008-06-14 00:58 UTC Modified: 2008-06-19 22:47 UTC
From: sixd@php.net Assigned:
Status: Closed Package: DBM/DBA related
PHP Version: 5.3CVS-2008-06-14 (CVS) OS: Linux
Private report: No CVE-ID: None
View Developer Edit
Welcome back! If you're the original bug submitter, here's where you can edit the bug or add additional notes.
If you forgot your password, you can retrieve your password here.
Password:
Status:
Package:
Bug Type:
Summary:
From: sixd@php.net
New email:
PHP Version: OS:

 

 [2008-06-14 00:58 UTC] sixd@php.net 
Description:
------------
The locking for DBA with DB4 needs to be revisited.

The way DB_INIT_LOCK and DB_FCNTL_LOCKING are passed to DB4, and
the use of DBA_LOCK_EXT in dba.c seem to be based on the assumption
that BDB will do locking.  This isn't true with the way BDB is used by
DBA.

See http://bugs.php.net/bug.php?id=45266 for why DB_INIT_LOCK isn't
valid.  DB_FCNTL_LOCKING is undocumented.  It implies that PHP does
locking. It just tells BDB when to release file handles.

Perhaps the easiest solution is for dba.c to use DBA_LOCK_ALL, but
I'm not fully aware of the implications of this flag.

Patches

Pull Requests

History

AllCommentsChangesGit/SVN commitsRelated reports
 [2008-06-19 22:47 UTC] sixd@php.net 
This bug has been fixed in CVS.

Snapshots of the sources are packaged every three hours; this change
will be in the next snapshot. You can grab the snapshot at
http://snaps.php.net/.
 
Thank you for the report, and for helping us make PHP better.

DBA with BDB 4 nows uses DBA's file locking so datafile corruption should no longer be possible.

A side effect of re-introducing DBA-enforced locking is that "reading during write" (see tests/dba_db4.phpt) is not allowed. This is consistent with all other DBA drivers.
 
PHP Copyright © 2001-2025 The PHP Group
All rights reserved. 		Last updated: Fri May 09 13:01:28 2025 UTC