[Info-vax] VMS process communication

[Stephen Hoffman]

On 2022-09-14 01:14:32 +0000, Arne Vajhj said:

> On 9/13/2022 8:56 PM, Dave Froble wrote:
>> 
>> As Rob pointed out, one can do a lot with the DLM.
>> 
>> Isn't synchronization itself a form of communication?
> 
> Yes.
> 
> But not what I would call general communication.
> 
> It is not intended to send arbitrary messages - it is intended to 
> synchronize flows.

Doorbell locks are common—albeit when last I checked, the documentation 
on the technical was, well, missing—and locks and lock value blocks are 
how an app passes around state even in the event of cluster host 
failures.

If you want a primary-secondary design or anything similar with a 
counter or similar app-local context or related failovers, locks are 
how that's done on OpenVMS.


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