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From: Rob on 6 Mar 2006 12:52
Hello,

I've got an issue where a process in a third party application has a dll
which while exiting sort of freezes and runs away with processor cycles.

i've written a block of code so that I can drill down into the process, and
get the offending Thread's ID (since the only ones that will have the issue
have higher User processor Time).

But, I can't figure out how to have my .Net app 'kill' or 'suspend' a Thread
based on the Id I have gotten. I see a lot of samples on how to do this with
treads your application starts itself, but nothing 'external' to the app.

Anyone able to lend a hand?

Here's my base routine.....


private static void DoSuspendThread(string processName)
{
// Suspend thread
Console.WriteLine("Passed " + processName);

try
{

Process[] myProcesses = Process.GetProcessesByName(processName);

foreach (Process myProcess in myProcesses)
{

foreach (ProcessThread t in myProcess.Threads)
{
// info += myProcess.ProcessName + " " + t.Id + " " +
t.UserProcessorTime + Environment.NewLine;
TimeSpan time = new TimeSpan(0, 1, 0, 0, 0);
if ((t.UserProcessorTime > time) && (t.ThreadState ==
System.Threading.ThreadState.Running))
{

// Kill or suspend here


}
}


}


}
catch (Exception e)
{
Console.WriteLine("Exception " + e.Message);
}
}
From: Markus Stoeger on 6 Mar 2006 14:47
Rob wrote:
> Hello,
>
> I've got an issue where a process in a third party application has a dll
> which while exiting sort of freezes and runs away with processor cycles.
>
> i've written a block of code so that I can drill down into the process, and
> get the offending Thread's ID (since the only ones that will have the issue
> have higher User processor Time).
>
> But, I can't figure out how to have my .Net app 'kill' or 'suspend' a Thread
> based on the Id I have gotten. I see a lot of samples on how to do this with
> treads your application starts itself, but nothing 'external' to the app.
>
> Anyone able to lend a hand?

I'd definitely get them to fix their code instead of creating ugly
workarounds. No piece of code lasts longer than a workaround.

Max
From: "Yuan Ren[MSFT]" on 7 Mar 2006 05:58
Hi,

Thanks for your post!

From your description, my understanding is that you want to kill some
threads from another .NET application. If I have misunderstood anything,
please let me know.

As far as I know, if you want to kill the thread, you have to use the Win32
API to approach this. I'll explain this limitation later. First of all, I
don't recommend you kill the thread in the foreach statement. I suggest you
save the thread id which you want to kill in some structures such as array
or array list. Then, you can call OpenThread method to get the handle of
the thread. After performing, please call TerminateThread function to kill
the thread directly. You can obtain more information about these two
methods by accessing link below:
OpenThread:
http://msdn.microsoft.com/library/default.asp?url=/library/en-us/dllproc/bas
e/openthread.asp

TerminateThread:
http://msdn.microsoft.com/library/default.asp?url=/library/en-us/dllproc/bas
e/terminatethread.asp

BTW, you should use these methods by P/Invoke. If you have anything
unclearly about the P/Invoke, please feel free to let me know.

Actually, this way is not recommend because the ProcessThread is supposed
only to get some information but not performing manipulations. That's way
there is no abort, suspend, join method in the ProcessThread unlike the
Thread class. So, the better way is get the fix or workaround from the
software vendor as Max mentioned. Thanks for your understanding!

Regards,

Yuan Ren [MSFT]
Microsoft Online Support
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From: Rob on 7 Mar 2006 07:26
I'm not sure if it makes a difference, but its not a thread from another .NET
application.

I know ideally it would be best for the vendor to just 'fix' the problem,
but, they are having a hard time admitting to the problem, and discovering
the cause (and their first answer is 'upgrade' which could prove even more
problematic than killing threads that are looking like they've done their
task and are exiting).

P/Invoke does look like the road to go... just a long dark and scary road.

Thanks for the assist,

Rob

From: Willy Denoyette [MVP] on 7 Mar 2006 07:45
Honestly, I don't think this is the road to go, take a look at the
description of TerminateThread, especially the remarks, if these aren't
enough reason NOT to kill arbitrary threads in a another process, well, go
ahead, I wish you all the luck.
Anyway, you need to find out what's really hapening, I'm not entirely clear
on what you mean with "... has a dll which while exiting ...", what exactly
do you mean with that? Another thing which I'm not sure about is who creates
the thread, the DLL code or the client code? And is the client code also a
third party?



Willy.



"Rob" <LandstarRob(a)nospam.nospam> wrote in message
news:4FDA261A-7EB4-4DFB-A870-1BA9B07DF2E5(a)microsoft.com...
| I'm not sure if it makes a difference, but its not a thread from another
..NET
| application.
|
| I know ideally it would be best for the vendor to just 'fix' the problem,
| but, they are having a hard time admitting to the problem, and discovering
| the cause (and their first answer is 'upgrade' which could prove even more
| problematic than killing threads that are looking like they've done their
| task and are exiting).
|
| P/Invoke does look like the road to go... just a long dark and scary
road.
|
| Thanks for the assist,
|
| Rob
|


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