Looks good to me. Thanks.
On Thu, Mar 18, 2010 at 1:54 PM, Bas van Dijk
Hello,
after discovering the bugs regarding asynchronous exceptions and laziness in Data.Unique and Control.Concurrent.SampleVar I became a bit suspicious about the other concurrency mechanisms.
It looks like Control.Concurrent.Chan is safe because it uses modifyMVar_ internally which performs the necessary block.
Control.Concurrent.QSem and QSemN are not alright however! They both suffer the same bugs:
* Potential dead-lock due to not blocking asynchronous exceptions. * Potential space-leak because of lazily putting numeric expression in a MVar.
The attached patch fixes these bugs.
regards,
Bas
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