Re: [isabelle] A few thoughts about Java multithreading model in relation to type-safety



Hi Tambet,

in Isabelle, I have formalized a notion of type safety for the Java multithreading model with deadlocks in the JinjaThreads article in the Archive of Formal Proofs (http://afp.sourceforge.net/entries/JinjaThreads.shtml).

There, I do allow deadlocks in showing type safety in the style of progress and preservation: The progress is restricted to non-deadlocked cases. Note that not only deadlocks via locking violate the progress property. Java's wait-notify-mechanism and joining of threads can similarly cause problems with progress. Suppose a thread is in a wait set - waiting to be notified or interrupted - but there is only one other thread which joins on the thread in the wait set. I would also call this a deadlock.

Andreas

--
Karlsruher Institut für Technologie
IPD Snelting

Andreas Lochbihler
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