home
> blog
>> 418
| [previous] / [up] | [overview] | [down] / [next] |
Sat Aug 13 18:38:40 2005 GMT: Upgrading to Hoary Hedgehog
Tue Aug 09 18:16:19 2005 GMT: One More Reason to Ignore Google
Mon Aug 08 19:17:15 2005 GMT: Concurrent Access To SQLite Database
One of the weak points of SQLite is when multiple threads or processes are trying to access the same database. While SQLite ensures that the database isn't corrupted, the behaviour most likely isn't desirable, because SQLite only uses a very simplistic way of locking. Essentially, it uses polling when waiting for a lock (which might lead to starvation and consequently to SQLite BusyErrors). The SQLite developers are blaming the brokenness of POSIX file locking in multi-threaded programs.
To work around this limitation, I have enclosed database accesses in a mutex in JabRSS (where multiple threads try to access the same database), and I am using POSIX file locking in WebRSS (where multiple processes might try to access the same database). At least I get the desired behaviour with some additional coding.
Sun Aug 07 08:29:41 2005 GMT: Solaris Internals
If you are interested in Solaris internals, there are a few blogs on blogs.sun.com worth reading: Joe Bonasera, Jim Mauro, Rod Evans, Richard McDougall and Tim Marsland.
Particularly interesting is this Solaris on Xen progress report.
Tue Aug 02 19:54:03 2005 GMT: Atom 1.0
Now that the Atom publishing format is approaching version 1.0, I have added some support for Atom 1.0 in WebRSS and JabRSS.
Sun Jul 31 15:29:04 2005 GMT: Anti-Virus Software Flaws
Recently, lots of security flaws have been found in anti-virus software (see this story from The Register and this ClamAV Security Advisory). These flaws are particulary annoying as they can be exploited by simply sending an e-mail to the victim (even if the victim doesn't open the e-mail, the anti-virus software will usually automatically scan every e-mail message and is therefore vulnerable).
Oh, by the way, about a week ago, a Bitdefender client tried to launch another denial of service attack on our company's proxy server (also see here).
Wed Jul 13 19:15:04 2005 GMT: Mail System Changes at web.de
Apparently, web.de is changing their mail system setup. Previously, only one server at web.de (mx??.web.de) was involved with forwarding e-mail messages (FWIW, I believe these MX servers are running some customised version of exim). Now I am seeing an additional hop (fmmailgate??.web.de) in the Received headers of forwarded messages which seems to be running some version of sendmail.
Tue Jul 12 19:14:31 2005 GMT: Domain Grabbers
Thu Jun 30 17:01:09 2005 GMT: Alpha Processor Comeback?
Tue Jun 28 19:43:53 2005 GMT: Testdriving 16x 1.5 GHz Itanium
Sun Jun 26 15:50:28 2005 GMT: Anti-Virus Software Quality
Sat Jun 18 10:57:42 2005 GMT: WebRSS
