[Haskell-cafe] BlockedIndefinitelyOnMVar exception
brandon_m_moore at yahoo.com
Thu Mar 31 16:37:41 CEST 2011
> From: Gregory Collins <greg at gregorycollins.net>
> Sent: Thu, March 31, 2011 5:03:09 AM
> I find this behaviour a little annoying. Sometimes I *want* the thread
> to block indefinitely! I.e. I want it to block until it receives a
> KillThread exception. Is there a better way to accomplish that without
> waiting on an MVar which will never fill? As a workaround what I've
> been doing lately is stashing another reference to the mvar somewhere
> else (I'm guessing the trigger condition for
> "BlockedIndefinitelyOnMVar" is "blocked and mvar refcount == 1").
If you plan to send an exception, you must have the ThreadId saved elsewhere,
which should prevent the BlockedIndefinitelyOnMVar exception.
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