Wed, 12 Apr 2000 15:12:31 +0100, Claus Reinke <[EMAIL PROTECTED]> pisze:
> PS. As for tryTakeMVar or locks on MVars, what is wrong
> with using MMVar a = (MVar (MayBe a)) and a suitable
> access protocol?
>
> MVar empty --> MMVar is locked
> MVar Nothing --> MMVar is empty, not locked
> MVar (Just v) --> MMVar holds value v, not locked
That it's impossible to implement the equivalent of takeMVar
(block until it is full).
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