PROPOSAL(S): threadWaitError and threadWaitErrorSTM

[Merijn Verstraaten]

Hola!

Control.Concurrent currently has:

threadWaitRead :: Fd -> IO ()
threadWaitWrite :: Fd -> IO ()
threadWaitReadSTM :: Fd -> IO (STM (), IO ())
threadWaitWriteSTM :: Fd -> IO (STM (), IO ())

(btw, whoever added the STM versions, I <3 you)

I would like to propose adding:

threadWaitError :: Fd -> IO ()
threadWaitErrorSTM :: Fd -> IO (STM (), IO ())

to allow for blocking on detecting error condition on file descriptors, similar to what C's select() allows.

Cheers,
Merijn
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