[Haskell-cafe] Re: Asynchronous exception wormholes kill
ml at isaac.cedarswampstudios.org
Thu Apr 8 21:22:34 EDT 2010
On 04/08/10 19:56, Bas van Dijk wrote:
> Control.Concurrent.Thread.fork is a similar and simpler example of why
> nonInterruptibleMask is needed:
> If an asynchronous exception is thrown during the 'putMVar res' any
> waiters on the thread will never be woken up.
OK, thanks for the link! In fact, [tell me if my reasoning is
wrong...], in that fork-definition, the 'putMVar' will never block,
because there is only putMVar one for each created MVar. I seem to
remember that any execution of putMVar that does not *actually* block is
guaranteed not be interrupted by asynchronous exceptions (if within a
Control.Exception.block) -- which would be sufficient. Is my memory
right or wrong?
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