Re: [Mailman-Developers] race condition in locking ?
[Thomas Wouters]
On Mon, Feb 07, 2000 at 09:31:44PM +0100, Ricardo Kustner wrote:
I wonder though what happens if some impatient moderator decides not to wait before the page finnishes loading, switches to a differen webpage and therefor breaks the python cgi process... will some approved posts stay in the queue instead?
Try it out ! ;) It depends on the exact behaviour of both the webbrowser and the webserver.
Yup. This might produce a SIGPIPE, and/or the corresponding IOError
EPIPE, and I've experienced that these didn't always get caught -- an
attempt at a fix is near the end of run_main in http://www.uio.no/~hmeland/tmp/mailman-userdb/scripts/driver>, but I'm
by no means positive that it's the Right fix.
Harald
"HM" == Harald Meland Harald.Meland@usit.uio.no writes:
>> I wonder though what happens if some impatient moderator
>> decides not to wait before the page finnishes loading, switches
>> to a differen webpage and therefor breaks the python cgi
>> process... will some approved posts stay in the queue instead?
>> Try it out ! ;) It depends on the exact behaviour of both the
>> webbrowser and the webserver.
HM> Yup. This might produce a SIGPIPE, and/or the corresponding
HM> IOError EPIPE, and I've experienced that these didn't always
HM> get caught -- an attempt at a fix is near the end of run_main
HM> in <URL:
HM> http://www.uio.no/~hmeland/tmp/mailman-userdb/scripts/driver>,
HM> but I'm by no means positive that it's the Right fix.I've done a bit of testing using Apache and both NS and MSIE. What I did was add a big sleep in admin.py, in main(), just before the finally at the bottom of the function. I added some debug prints so I could see what was going on.
As near as I can tell, if I hit the browser's stop button after entering that big sleep, the CGI process gets kill stone cold. It never reach the finally clause, doesn't get a SIGPIPE, nothing. Since I can't reproduce this, I'm not sure what the right thing to do is.
Harald, what webserver are you running?
-Barry
participants (2)
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bwarsaw＠python.org -
Harald Meland