ThreadPool.QueueUserWorkItem

[James]

i uses the above to send some thread to many machines and perform a ping and
return results to my event log

Is there a way to determine when the *last* thread returns, and i can
terminate my console program automatically. ?

If i terminate my program *early*, the thread that return results will not
be written to my event log. Thus i cannot terminate my console program early
and i have to manually write a loop and expects user to terminate it. My
loop was :

Console.WriteLi ne("Press 1 to quit the program or wait for 5 minutes before
typing 1.")

While Console.Read() <> 1

'waiting for my threads to return

End While

[James]

Re: ThreadPool.Queu eUserWorkItem

any advise ?


"James" <jkklim@hotmail .com> wrote in message
news:u0d8QcfMGH A.2696@TK2MSFTN GP14.phx.gbl...[color=blue]
>i uses the above to send some thread to many machines and perform a ping
>and return results to my event log
>
> Is there a way to determine when the *last* thread returns, and i can
> terminate my console program automatically. ?
>
> If i terminate my program *early*, the thread that return results will not
> be written to my event log. Thus i cannot terminate my console program
> early and i have to manually write a loop and expects user to terminate
> it. My loop was :
>
> Console.WriteLi ne("Press 1 to quit the program or wait for 5 minutes
> before typing 1.")
>
> While Console.Read() <> 1
>
> 'waiting for my threads to return
>
> End While
>
>
>
>
>
>[/color]

[Larry Lard]

Re: ThreadPool.Queu eUserWorkItem


James wrote:[color=blue]
> i uses the above to send some thread to many machines and perform a ping and
> return results to my event log
>
> Is there a way to determine when the *last* thread returns, and i can
> terminate my console program automatically. ?[/color]

WaitHandle.Wait All is probably what you are after. Because I am feeling
generous, I append a VB.NET translation of the WaitAny / WaitAll
example from one of Jon Skeet's excellent C# threading pages at
<http://yoda.arachsys.c om/csharp/threads/waithandles.sht ml>. You should
be able to adapt this example to your own code easily enough.

Imports System
Imports System.Threadin g

Public Class Test

<MTAThread()> _
Public Shared Sub Main()
Dim events As ManualResetEven t() = New ManualResetEven t(10) {}

Dim i As Integer
For i = 0 To events.Length - 1
events(i) = New ManualResetEven t(False)
Dim r As Runner = New Runner(events(i ), i)
Dim t As Thread = New Thread(New ThreadStart(Add ressOf
r.Run))
t.Start()
Next

Dim index As Integer = WaitHandle.Wait Any(events)

Console.WriteLi ne("***** The winner is {0} *****", index)

WaitHandle.Wait All(events)
Console.WriteLi ne("All finished!")
Console.ReadLin e()
End Sub

End Class

Public Class Runner

Private Shared ReadOnly rngLock As Object = New Object
Private Shared rng As Random = New Random

Private ev As ManualResetEven t
Private id As Integer

Friend Sub New(ByVal ev As ManualResetEven t, ByVal id As Integer)
Me.ev = ev
Me.id = id
End Sub

Friend Sub Run()
Dim i As Integer

For i = 0 To 9
Dim sleepTime As Integer
' Not sure about the thread safety of Random...
SyncLock (rngLock)
sleepTime = rng.Next(2000)
End SyncLock

Thread.Sleep(sl eepTime)

Console.WriteLi ne("Runner {0} at stage {1}", id, i)
Next i

ev.Set()
End Sub

End Class

--
Larry Lard
Replies to group please