Saturday, December 22, 2012

deadlock involving a single lock

Deadlock is seldom found in real projects. Even if an observed problem is actually due to deadlock, the problem is usually resolved without the deadlock being identified. Most managers and teams are happy to see a problem disappear and not motivated to uncover root cause(s).

The classic (2-lock) deadlock situation is usually hard to reproduce, which makes it a rare natural disaster, but possibly catastrophic. I've never seen it but if a deadlock were consistently reproducible, then it would be much easier to resolve.

However, if you are serious about deadlock problems in real projects, you can't ignore one of the more common deadlock patterns -- 2 threads deadlock each other with a single lock.

I'd /go out on a limb/ to claim that this pattern is arguably more common than the 2-lock textbook pattern. It may account for up to 90% of all uncovered deadlock cases.

P90 [[eff c#]] also shows a single-lock deadlock.

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