Am Freitag, den 07.10.2005, 14:44 -0400 schrieb Tim Peters: > [Christian Theune] > > It looks like we have been bitten by a bug in a C-Module for MySQL > > access. Sometimes it led to a segfault, a halt, or the hang. We can't > > reproduce it after switching that C-Module anymore. > > Any theory for how that could make all four threads appear to be blocked on > an attempt to get the commit lock? Bad code at the C level can cause any > kind of "impossible" behavior, but there's usually a more-or-less clear > connection to the impossible symptom observed. Without such a connection, > it remains plausible that, e.g., some _other_ bad C-level code is really at > fault, and switching an irrelevant bit of C code just happened to mask it > for the time being.
Unfortunately not. Did I mention we had those problems on a production system? *yuck* No time to play around except of fixing it ... :/ > > I really hate C-Modules for Python right now. > > They're no worse than C code written for other purposes. I just noticed > that doing a Google search on > > mysql segfault > > gives over 200000 hits. That's about average for C code <wink>. Right. :) (They especially like to segfault when mysql server and client libraries don't exactly match in version numbers) One paper, that is unfortunately rather old, I found a couple of hours ago and which sounds very intesting to me: http://systems.cs.uchicago.edu/wad/python.html Didn't we have those features in Ada already? ;) Cheers, Christian -- gocept gmbh & co. kg - schalaunische str. 6 - 06366 koethen - germany www.gocept.com - [EMAIL PROTECTED] - phone +49 3496 30 99 112 - fax +49 3496 30 99 118 - zope and plone consulting and development
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