Using VS 2003, VB, MSDE...
There are two threads, A & B, that continously run and are started by Sub
Main. They instantiationsl of identical code. Thread A handles call
activity on telephone line 1 and Thread B handles call activity on telephone
line 2. They use a common SQL datasource, but all DataSets are unique to
each thread.
Is there a way for thread A to occasionally communication to thread B that
something has happened? The ideal situation would be for thread A to raise
an event that a handler in thread B handles. But, I don't see how to do
that (the raised event would be handled "up the call stack" in Sub Main, not
"horizontia lly" by the other thread).
Specifically, thread A has added a row(s) to the common datasource that I
need thread B to know about. I am currently doing it with a timer in thread
B that check the common datasource for changes every 15 seconds, which works
OK, but am looking for a simpler solution. I have looked at SQL triggers,
but don't see how that would alert thread B. I have looked at RaseEvents,
but don't see any help there either.
Any ideas? Do System.Timers. exert a heavy resource usage toll? If not I
may jus stick with the timer method.
Thansk!
Bob
Nov 20 '05
20  2417 
Hi David,
Thanks for your answer,
What I did try to show in this thread is (the problem is not important
anymore) that there is chosen for a thread solution instead of a remoting
solution. There is a Main process, which starts two threads.
With "horizontal " solutions, I mean that the managing of the solution is not
ordered by a higher vertical level but done on the same process level.
However, it is worse, the solution is:
Main
- B
- A
B is doing the control part using timers, (I said before those timers is not
the most important of the bad design).
The solution could have been remoting (and than I agree, with all what you
say)
A B with control to each other
Or multithreading
Main (with control over A and B)
A B
What you said about what I should have said about the data process approach
I never said, in both situations it is in my opinion that the best (the
only) choose to use separated data, it would otherwise kill it self in
concurrency problems.
I hope this makes it clearer.
Cor
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