This is easy to test :)
1 2 3 4 5 6 7 8 9 10 11 12
let x = lazy(
printfn "start..."
System.Threading.Thread.Sleep 3000
printfn "end"
42)
let a = [x;x]
|> Seq.map (fun x -> async { return x.Value })
|> Async.Parallel
|> Async.RunSynchronously
printfn "%A" aSee also
if you are using .NET 4.0 and want to read about more fine-grained control.
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Say I have something like this :
let comp = lazy(Long computation).Assuming that "Long computation" has no side effects.
If I call force on in from different threads, what is going to happen ?
Is "Long computation" going to be evaluated two times ?