[Haskell-cafe] what is f=f (not) doing ?
bulat.ziganshin at gmail.com
Sun Sep 23 06:58:45 EDT 2007
Sunday, September 23, 2007, 2:05:46 PM, you wrote:
i bet that general case contains too much conditions to check. program
may be unblocked by other thread, by OS signal, by I/O operation
completion, by C thread. how for example RTS can check that we have
started I/O operation with completion callback which will call abort()
> I agree. This situation is totally detectable.
> On 9/23/07, Neil Mitchell <ndmitchell at gmail.com> wrote:
>> I'm not sure, but since it would require the detection of an evaluation
>> that does not terminate, it comes down to the halting problem, which is
>> not generally solvable. Maybe the experts can confirm my intuition?
> I think your intuition is off. This isn't the problem of detecting
> that a computation might not halt, its a question of detecting after
> the fact a very restricted case of non-termination has occurred. I
> think it should be possible to assign threads etc to these things, but
> may make the code run slower in the common case.
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