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On 14/10/2009, at 4:51 AM, M. Lazarus wrote:

It's no big deal either way, but I don't see a huge advantage to
named sigs. As to IBM's not using *PRV in their own modules, I'm
curious how they manage their object generation so that everything is
in sync and it's never an issue.

1) Because they recompile everything for a new release so consumers will pick up any changed export order.
2) Because they don't change the export order--just add new exports to the end
3) Because they are careful during development and test before public release

For what it's worth: I do use the *PRV support in service programs because it allows me to see which version a CONSUMER is using. There is no real advantage between *PRV with either system-generated signatures, *PRV user-defined signatures, or having only a *CURRENT user-defined signature block as far as the SERVICE PROGRAM is concerned. Yes, you can see some level of "history" but since you can't see what exports belong with a given signature (except by examining the binder source) it's of limited use.

What it does give me is knowledge that this PROGRAM expects signature such-and-such and that can help me diagnose certain problems. I know the program's view of the world.

I generally don't expose one procedure at a time (at least not for the released code) so I will have a group of new procedures in the current signature block. That avoids Scott's complaint about having 500 signature blocks due to releasing a service program "version" for each new export.

I also don't agree with breaking compatibility by removing an export or by changing the export order. If you need to do that then you didn't get your design right.

Regards,
Simon Coulter.
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