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  2. RPG400-L
  3. April 2004

Re: More ILE 101

Joe Pluta wrote: 
It was thus fairly easy to implement re-entrancy by simply allowing
multiple copies of the data portion.  Unfortunately, RPG had some
limitation on re-entrancy that I never quite understood, but CL programs
could call themselves and each call level would have its own data
portion in the PAG.

Activation groups can be use to get around the re-entrancy issue with
RPG.   With *NEW, each call to the RPG program sets up its own data
group, and thus there are no recursion issues.  But there aren't
multiple copies of the program code, just of the data portion.

Maybe you are aware of this already, but RPG subprocedures can be called recursively. All file data, including file pointers, are global though, so recursively looping through a set of records takes some repositioning.

Joep Beckeringh

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