Saturday, January 2, 2010

unlock@thread death

(See other posts about "consistency" issues due to the Release.)

Q: will the dead thread Hold or Release its locks?

* c++? -- H. You need RAII. See posts on RAII
* For java sync-keyword -- Release is guaranteed. See 2.2.1 [[Doug Lea]], P123 [[java threads]].
* For Lock.java, by default dead threads -- Hold locks. see P123 [[java threads]]. Finally block is recommended.
* Thread.destroy()/suspend() + sync-keyword? -- H, leading to deadlock
* Thread.stop() + sync-keyword? -- R, leading to inconsistency
* What if i use Lock.java and Thread.stop()? My guess is -- H

The give-and-take, the cost/benefit -- Hold protects consistency but risks liveness; Release provides liveness but risks consistency.

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