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Re: [PATCH] Final: thread lock nesting debugging

From: Neil Jerram
Subject: Re: [PATCH] Final: thread lock nesting debugging
Date: Wed, 19 Nov 2008 23:14:33 +0000

2008/11/17 Linas Vepstas <address@hidden>:
> I've been seeing all sorts of deadlocks in guile, and so I wrote a small
> debugging utility to try to track down the problems.

Interesting patch!

One query; I may be being a bit dumb, I'm only just recovering from a
bad cold, but anyway...  Your patch checks for a thread unlocking
mutexes in the reverse order that it locked them in (let's call this
point "A").  But I thought your recent investigations had shown that
the problem was threads doing locking in inconsistent order, e.g.
thread 1 locks M1 and then M2, while thread 2 locks M2 and then M1
(point "B").  Are points "A" and "B" equivalent?  (It isn't obvious to
me if so.)


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