Re-running an already created thread.

Robert Wilson

Hi,
I am running a separate thread in order to be able to poll devices on a
MODBUS RTU network. I create a thread and look at the ThreadObj.IsAli ve
flag, and this work ok. I then might have to come back later to the
thread an re run the task contained within it. When I come to re-run
the thread, when I call to ThreadObj.Start it throws an exception.
Ordinarily in C++ I would delete the ThreadObj and then re-create one
with the oThread = new Thread(new ThreadStart(Sea rchThread)); call.
Seeing as I cannot do my own garbage collection when I need to wondered
if anyone had any comments?

Most of my experience is C++/MFC and am now porting a current app to C#
in order to better my understanding of the langauge.
Thanks,

Rob.

Nov 16 '05 #1

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2353

Brian Gideon

Robert,

You will have to recreate the thread exactly as you indicated. Though,
you should make sure that the original thread is not running first.
Take a look at the following multipage article on multithreading in
..NET for tips on working with threads. The article is an excellent
resource that is frequently cited in this group.

<http://www.yoda.arachs ys.com/csharp/threads/>

Also, there may be better design patterns for executing this task. One
alternative that comes to mind is to create a thread that is dedicated
to executing the task. This thread will sit idle in an infinite loop
waiting for an event (AutoResetEvent or ManualResetEven t) to be
signaled that instructs the thread to begin executing the task. If the
task completes quickly the ThreadPool may be a better approach. It's
difficult to say for sure which one is better without knowing what the
task does.

Brian

Robert Wilson wrote:

Hi,
I am running a separate thread in order to be able to poll devices on
a MODBUS RTU network. I create a thread and look at the
ThreadObj.IsAli ve flag, and this work ok. I then might have to come
back later to the thread an re run the task contained within it.
When I come to re-run the thread, when I call to ThreadObj.Start it
throws an exception. Ordinarily in C++ I would delete the ThreadObj
and then re-create one with the oThread = new
Thread(new ThreadStart(Sea rchThread)); call. Seeing as I cannot do my
own garbage collection when I need to wondered if anyone had any
comments?

Most of my experience is C++/MFC and am now porting a current app to
C# in order to better my understanding of the langauge.
Thanks,

Rob.

Nov 16 '05 #2

Robert Wilson

Brian Gideon wrote:

Robert,

You will have to recreate the thread exactly as you indicated. Though,
you should make sure that the original thread is not running first.
Take a look at the following multipage article on multithreading in
.NET for tips on working with threads. The article is an excellent
resource that is frequently cited in this group.

<http://www.yoda.arachs ys.com/csharp/threads/>

Also, there may be better design patterns for executing this task. One
alternative that comes to mind is to create a thread that is dedicated
to executing the task. This thread will sit idle in an infinite loop
waiting for an event (AutoResetEvent or ManualResetEven t) to be
signaled that instructs the thread to begin executing the task. If the
task completes quickly the ThreadPool may be a better approach. It's
difficult to say for sure which one is better without knowing what the
task does.

Brian

Robert Wilson wrote:
Hi,
I am running a separate thread in order to be able to poll devices on
a MODBUS RTU network. I create a thread and look at the
ThreadObj.IsA live flag, and this work ok. I then might have to come
back later to the thread an re run the task contained within it.
When I come to re-run the thread, when I call to ThreadObj.Start it
throws an exception. Ordinarily in C++ I would delete the ThreadObj
and then re-create one with the oThread = new
Thread(new ThreadStart(Sea rchThread)); call. Seeing as I cannot do my
own garbage collection when I need to wondered if anyone had any
comments?

Most of my experience is C++/MFC and am now porting a current app to
C# in order to better my understanding of the langauge.
Thanks,

Rob.

Thanks a lot Brian. Looks like i'm on my way now.

Regards,

Rob.

Nov 16 '05 #3

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