threads in .net and protecting shared variables

Take a look at Monitor/Enter/Exit and lock(which uses Monitor
internally) to do synchronization. This is similar to Critical Section
in Win32. Another option to synchronize data is to use WaitHandle
derived classes, Mutex, ManualResetEvent and AutoResetEvents.

------
Ajay Kalra
aj*******@yahoo.com

Ajay Kalra wrote:

Take a look at Monitor/Enter/Exit and lock(which uses Monitor
internally) to do synchronization. This is similar to Critical Section
in Win32. Another option to synchronize data is to use WaitHandle
derived classes, Mutex, ManualResetEvent and AutoResetEvents.

Or, use "lock", which is inherently exception-safe and (in this case)
pretty easy to read and understand.

You do realize that your OnDriverSendResult is not re-entrant -- even on
it's own?

You seem to be using a self-implemented linked list, why not use one of
the supplied data-structures in .NET?

BTW: this is the classic producer/consumer problem.

An easy solution, which should perform very well too, is sketched below.

The AutoResetEvent below is entirely optional code, but usefull if you
have a dedicated thread for running ProcessList.

readonly IList Queue; // Use ArrayList or LinkedList or whatever
readonly AutoResetEvent QueueNotEmpty = new AutoResetEvent();
public void OnDriverSendResult(RackDetail detail) {
lock ( Queue ) {
Queue.Add(detail);
QueueNotEmpty.Set();
}
}

private static IList emptyList; // choose any empty list to init with
public void ProcessList() {
IList process;
QueueNotEmpty.WaitOne();
lock ( Queue ) {
if ( Queue.GetEnumerator().MoveNext() ) { // non-empty?
process = new ArrayList(l);
Queue.Clear();
} else {
process = emptyList;
}
foreach ( RackDetail detail in process )
Process(detail);
}

--
Helge Jensen
mailto:he**********@slog.dk
sip:he**********@slog.dk
-=> Sebastian cover-music: http://ungdomshus.nu <=-

> You do realize that your OnDriverSendResult is not re-entrant -- even on

it's own?

Thanks for your help guys.
I don't know if you'll look back at this thread Helge but I've no idea what
you meant by the above (even though I looked it up on
http://dictionary.reference.com/search?q=re-entrant ). Can you explain for
this case please. thanks