Threading logical problem??

[James A Taber]

What I want to implement is to restart certain thread every 24 hours...

sample code:

Dim T() As Thread
Dim L() As Lib1.Class1
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As
System.EventArgs) Handles Button1.Click

Dim i As Integer = 0
For i = 0 To 2

ReDim Preserve T(i)
ReDim Preserve L(i)

L(i) = New Lib1.Class1
L(i).m1 = i

T(i) = New Thread(AddressOf L(i).StartTimer) '<--- Class1
contains a timer to do the required task.
T(i).Start()

Trace.WriteLine(T(i).ThreadState.ToString) '<---- Unstarted ??
Next

End Sub

 

[Armin Zingler]

What I want to implement is to restart certain thread every 24
hours...

sample code:

[...]
Trace.WriteLine(T(i).ThreadState.ToString) '<----
Unstarted ??

As long as *this* thread runs, the other one might still be unstarted, but
the OS will start it when it is it's turn.

Next

End Sub

Maybe I did not understand the problem, yet. Isn't starting a
System.Timers.Timer sufficient?

 

[James A Taber]

Hi Armin,

Thanks for you reply,

The timer works fine... what I am experiencing is that somtimes some of the
thread seams to stop working ... thats why I want to restart all the threads
in the application after a certain time....

-James A Taber

What I want to implement is to restart certain thread every 24
hours...

sample code:

[...]
Trace.WriteLine(T(i).ThreadState.ToString) '<----
Unstarted ??

As long as *this* thread runs, the other one might still be unstarted, but
the OS will start it when it is it's turn.

Next

End Sub

Maybe I did not understand the problem, yet. Isn't starting a
System.Timers.Timer sufficient?


--
Armin

http://www.plig.net/nnq/nquote.html
http://www.netmeister.org/news/learn2quote.html

 

[Jay B. Harlow [MVP - Outlook]]

James,
In addition to Armin's comments, have you tried using Thread.Sleep(0) to
give the second thread a chance to start?

Something like:

T(i) = New Thread(AddressOf L(i).StartTimer) '<--- Class1
contains a timer to do the required task.
T(i).Start()
Thread.Sleep(0)


Trace.WriteLine(T(i).ThreadState.ToString) '<---- Unstarted ??

Its not that your second thread did not start as much as your first thread
is not sharing the CPU. ;-)

Also in addition to restarting threads, you may want to consider restarting
AppDomains also.

Hope this helps
Jay

 

[James A Taber]

Hi Jay,

I have tried use Sleep(3000) but it didnt make any difference ... is it
possible that the timer in Class1 one is running in its own thread?

hm... restart Appdomain ? how can I do that ?

is this true --> Restart Appdomain = Initialize Application

James A Taber

 

[Jay B. Harlow [MVP - Outlook]]

James,

is it
possible that the timer in Class1 one is running in its own thread?

Hard to say as you don't say what type of timer is in Class1. Remember there
are 3 distinct Timer classes in .NET.

Hope this helps
Jay

 

[Jay B. Harlow [MVP - Outlook]]

James,
Yes restarting an AppDomain is effectively the same as re-initializing your
app, however you can control what parts of your app are running in which
AppDomain.

I don't have a clean example, to "restart" an AppDomain, you need to create
a new AppDomain and start execution there, letting the current one finish. I
would start by looking at the System.AppDomain class and its Load & Unload
methods...

Hope this helps
Jay

 

[James A Taber]

Thanks for helping me out Jay...

This is the Timer iam using

System.Timers.Timer

I will look more into the Appdomain "feature" later tonigh...

Thanks again
-James A Taber

 

[Jay B. Harlow [MVP - Outlook]]

James,
System.Timers.Timer will raise its event in a new thread (via the
ThreadPool), there is no need to create a thread to explicitly handle it.

For details on the Timers.Timer and the other 2 timers in .NET check out
this recent article:

http://msdn.microsoft.com/msdnmag/issues/04/02/TimersinNET/default.aspx

Hope this helps
Jay