Re: Callable statement with RPG

[Dieter.Bender@xxxxxxxxxxx (Dieter Bender)]

Am Montag, 18. März 2002 15:28 schrieben Sie:
> >rpg programmers don't know anything about multi-threading and therefor I
> >never would call any rpg programm or procedure synchronous via jni. I
> >wouldrecommend to use stored procedures for programs and UDFs for
> >subprocedures.
>
> I'm confused.  Are you suggesting that the RPG programmer can't learn to
> have synchronous JNI methods?

The problem is not calling a JNI method, the problem is to avoid deadlocks in
serialized methods and rpg modules have to be serialized. Using stored
procedures or UDFs SQL handles this on connection level.

>
> Wouldn't one or two nasty bugs be a sufficient teacher?
>
One or two nasty bugs ... did you ever have problems with deadlocks in
multithreaded applications???
The only way is to avoid this problems and there are only two rules:
- if you nest serialized blocks, bring the semaphores into an order
- never use a nonfinal method or an unknown method in a synchronized block

and the second rule applies to rpg - java - rpg calls.

>
> Larry W. Loen  -   Senior Linux, Java, and iSeries Performance Analyst
>                           Dept HP4, Rochester MN
>
>
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--
mfG

Dieter Bender


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