RE: Activation groups for beginners

["Smith, Nelson" <NSmith@xxxxxxxxxxx>]

I guess I'm not clear on how static storage is "shared".  That was the
original bullet point that confused me.  I'm teaching a class next week on
this subject and I had included that bullet point from the discussions on
this list, but I don't really understand it.

> -----Original Message-----
> From: Buck Calabro [SMTP:Buck.Calabro@commsoft.net]
> Sent: Thursday, March 07, 2002 11:47 AM
> To:   rpg400-l@midrange.com
> Subject:      RE: Activation groups for beginners
>
> >Can you elaborate a little on "static storage"...?
>
> Static storage is "left alone" between program calls.  It isn't
> initialised.
>
>  * Demonstrate static storage
>
> h debug dftactgrp(*no) actgrp('QILE') option(*srcstmt: *nodebugio)
>  * dbgview(*list)
>
> d incrAndDisplay  pr
>
> c                   callp     incrAndDisplay
> c                   eval      *inlr = *on
>
> p incrAndDisplay  b
> d incrAndDisplay  pi
>
> d countStatic     s             10i 0 static
> d countStaticInz  s             10i 0 static inz(10)
> d countAuto       s             10i 0
> d countAutoInz    s             10i 0 inz(10)
>
> c                   eval      countStatic    = countStatic    + 1
> c                   eval      countStaticInz = countStaticInz + 1
> c                   eval      countAuto      = countAuto      + 1
> c                   eval      countAutoInz   = countAutoInz   + 1
> c     countStatic   dsply
> c     countStaticInzdsply
> c     countAuto     dsply
> c     countAutoInz  dsply
> p                 e
>
> A traditional OPM program you'd expect to see that every one of these
> variables gets initialised every time the program is called.  The two
> variables marked with the 'static' keyword won't.
>
> Call this program.  The first time it runs you'll see 1, 11, 1, 11.  Run
> it
> again and you'll see 1, 12, 1, 11.  Now do a RCLACTGRP QILE and run it
> again.  A new AG('QILE') will be created and statuc storage initialised,
> so
> you'll see 1, 11, 1, 11 again.
>
> Static storage is handy when you need to keep track of something all day
> long, like the last time the function was called, or a count of how many
> jobs are using it.
>   --buck
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