Experimental Physics and
Industrial Control System

Andrew Johnson <[email protected]> · Thu, 15 Aug 2013 11:12:39 -0500

Hi Dirk,

On 08/15/2013 10:18 AM, Dirk Zimoch wrote:

Is it possible to make a database link wait for completion?

Not a regular link, but the "Async Soft Channel" output device supports

that come with Base 3.14 do exactly that. In 3.15 we also provide input

device supports which do process-get as well, which Marty had to do some

major internal surgery to support. The facility is now called

process-notify instead of put-notify as a result.

Now it would be nice to have "put notify" links, e.g:

    field (LNK1, "A.PROC PN")

So that LNK2 is only processed when the whole LNK1 chain has finished
processing.

Unfortunately we can't do this for regular links because the API that

record types call to do put and get operations on regular links doesn't

provide for the necessary callback-on-completion which would allow for

asynchronous operations like that. Making this something that could be

configured on a per-link basis would require rewriting every record type

to support such links.

- Andrew
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Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System