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Async.Run vs Async.AsyncFuture
f#async

Hi,

what is the difference between Run and AsyncFuture ?

I have tried the following in the fsi :

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  let task =
    async { do! System.Threading.Timer.SleepAsync(5000) 
            return 5
    }
  
  let f() =
    let y = Async.AsyncFuture(task)
    for i in 0 .. 100 do
      print_int i
    fire(y.Value)
    print_string ("\n" + any_to_string y.Value)

... which only prints the 100 values once the task has completed. As if I had called let foo = Async.Run(task) .

Thanks for any insight on Futures !

.Reply
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Hi Julien,

I can't reproduce your problem.

When I try your sample, all 100 numbers are printed. A few seconds later, the 5 is printed. If I replace AsyncFuture by Run, I wait 5 seconds and then everything is printed.

Async.Run runs the computation and waits (blocks) for the result. Async.AsyncFuture doesn't block, it's asynchronous. When you access to the Value member, it waits for the result (if computation isn't finished).

Laurent.

By on 4/10/2008 8:44 AM ()Reply
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Hi,

It does indeed work, but oddly enough the "bug" still remains in VS...

In any case, thanks a lot for the info on Future vs. Run ! That makes sense, at last!

Julien

By on 4/10/2008 12:09 PM ()Reply

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