Hi Tom,
You could use the LOCK/UNLOCK Basic statements. These are designed for
interprocess control, but I dont know if they will achieve your goal of
not wasting resources.
So in each program you would have something like this:
LOOP UNTIL LOCK n DO
RQM
REPEAT
process stuff here
UNLOCK n
where n is a number between 0 and 63.
The problem with this is that the process has to check on the lock, sleep,
wake up, check on the lock etc. It doesn't just stay blocked until the
lock is available.
The alternative would be to us a READU on a file that is already opened by
the program. I don't know which method would be the least resource
intensive - it would be interesting to experiment and find out.....
cheers,
asvin
[email protected] wrote on 26/02/2009 12:57:14:
> Tom Whitmore <[email protected]>
> Sent by: [email protected]
>
> Feb 26 2009 13:23
>
> Mail Size: 4681
>
> Please respond to
> [email protected]
>
> To
>
> "[email protected]" <[email protected]>
>
> cc
>
> Subject
>
> [U2] Inter-Process Control...
>
> Entity
>
> <Computed Value>
>
> We have two phantom processes. The first phantom needs to wait for an
event
> to occur with the second phantom. I realize that I could have the first
> phantom loop, check, then sleep. However, I'd like to avoid wasting
> resources. Back on the Prime, I could use semaphores, to control this
flow
> and this was clean, and simple. Has anyone come across a means of
having a
> phantom wait on "something", so it only wakes up when it needs to
perform its
> function?
>
> To try to explain better:
>
> Phantom1:
> Loop
> Wait on semaphore
> Perform a shared process (batch updates would be an example)
> Repeat
>
>
> Phantom2 (3, 4, ...):
> Loop
> Process records
> Notify semaphore
> Repeat
>
> Thanks,
> Tom Whitmore
> RATEX Business Solutions
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