isEmptyChan, System.Posix.Signals

[Volker Stolz]

In local.glasgow-haskell-users, you wrote:
> 1. 'isEmptyChan x' blocks if x is empty and some other thread is waiting
> to read from x:
>
> Prelude Control.Concurrent> x <- newChan
> Prelude Control.Concurrent> forkIO $ readChan x
> Prelude Control.Concurrent> empty <- isEmptyChan x
> *** Exception: thread blocked indefinitely
>
> Is that the intended behaviour? Is it possible to make a non-blocking
> version?

This is a known limitation. Search the mailinglist-archives for a
proposed fix.
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