asked on

Good terminating threads in compact dontnet framework 2.0 in vb.net

I am using a google web service in my application for PDA , and this web service executed by a separated thread , but the response of the web service not always success , that make the application freezed with error message .
How I emulate Thread.isAlive method and avoid running many threads and to be sure the thread is 100% terminated before calling the thread again ?
Please in VB.net example
My application run for 3 Hours then freezed
PDA is a windows mobile 6.5 pro OS , I am using VS2005

hjgode

Here is a pseudo code snippet:

sub thread
try
while(bRunThread)
'Do work
wend
catch(ThreadAbortException)
end try
bThreadIsStopped=TRUE
end sub

in main code you can set bRunThread to False but this will terminate thread not directly. Better use Thread.Abort to produce a thread abort exception and then the try/catch will end your thread. Then in main check if bThreadIsStopped.

I can only provide csharp sample: see http://www.hjgode.de/wp/2010/06/01/mobile-development-easy-to-use-background-thread-with-gui-update/

regards

Josef

DODO

ASKER

I think it the same problem i have
sub thread
try
while(bRunThread)
'Do work
>>>> here were the web service kill wend loop that preventing thread to be terminated <<<
wend
catch(ThreadAbortException)
end try
bThreadIsStopped=TRUE
end sub

Nasir Razzaq

Try calling the thread.Abort function from the main code.

hjgode

Yes, that is the same I suggested.

a) you create the thread from main code
b) Thread.Abort will also work for long blocking call inside while loop and the ThreadAbortEception is fired
c) the var setting at the end of the thread will allow you to check if the thread is still running

regards

Josef

DODO

ASKER

I made a simple code for test but I found a problem
bThreadIsStopped=TRUE statement reached in debugging mode normally by setting
bRunThread = false in the main code that is ok but using Thread.Abort the ThreadAbortException triggered and not reached the bThreadIsStopped=TRUE statement which mean the thread still running or should i modify the code as
try
while(bRunThread)
'Do work

wend
catch(ThreadAbortException)
bThreadIsStopped=TRUE <<<<<<< is this right ??? to indicate the termination
end try
bThreadIsStopped=TRUE <<<<<< not reached in case ThreadAbortException
end sub

DODO

ASKER

In normal case if the thread sub method returned without error is this mean that thread really terminated ?
as the example when we set bThreadIsStopped=TRUE and exit while loop normally

ASKER CERTIFIED SOLUTION

hjgode

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