[Haskell-cafe] Implementing computations with timeout

Simon Marlow simonmar at microsoft.com
Mon Jan 10 12:02:40 EST 2005

On 07 January 2005 20:00, Sebastian Sylvan wrote:

> On Fri, 7 Jan 2005 20:56:42 +0100, Sebastian Sylvan
> <sebastian.sylvan at gmail.com> wrote:
>> On Fri, 07 Jan 2005 15:31:10 +0200, Einar Karttunen
>> <ekarttun at cs.helsinki.fi> wrote:
>>> Hello
>>> What is the best way of doing an computation with a timeout?
>> I like the approach taken in  "Tackling the ackward squad":
> I should also state that this isn't safe when it comes to asynchronous
> exceptions.
> If one were to raise an exception in a timeout'd computation it would
> simply abort the takeMVar which means the two child processes won't
> get killed.

Yes, making a timeout combinator that (a) can be nested and (b) is
invisible with respect to asynchronous exceptions is quite a challenge.
I'm not sure that we managed to do it.  STM will almost certainly make
it easier, though.


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