RE: FW: Have you seen this?

["Peter Connell" <Peter.Connell@xxxxxxxxxxxxxxxxxxxx>]

We had similar problems related to exceeding storage but they occurred at 
runtime (disastrously).
They also relate to large length return variables.
I believe IBM regard the accomodation of many large length return variables as 
a "weaker" area that does not have a simple solution.
It appears to be an issue only in certain situations when there are many 
repeated calls.
As suggested, the solution lies in adopting programming practice that avoids 
using large length variables as return values in favour of returning the value 
as large length parameter which works well no matter how many repetitions occur.

Peter


-----Original Message-----
From: rpg400-l-bounces@xxxxxxxxxxxx
[mailto:rpg400-l-bounces@xxxxxxxxxxxx]On Behalf Of Mel Rothman
Sent: Tuesday, February 24, 2004 10:55 AM
To: rpg400-l@xxxxxxxxxxxx
Subject: Re: FW: Have you seen this?


I was able to reproduce this problem on a V5R2 system.

It appears that the mainline is calling subprocedure ZhbGetVar 508 times and 
this is causing the compilation to fail with MCH3216.  This could be either a 
system limitation (possibly a maximum of 16 MB for values returned by 
subprocedures) or a bug (that is, the limitation should not exist).

ZhbGetVar returns a 32767 varying field, which is 32769 bytes including its 
byte 
length.  32769 times 508 comes very close to 16 MB.

You may want to contact IBM service about this problem to see if it can be 
fixed 
or whether it is, in fact, a limitation.

In the meantime, you can get around the problem by writing your own 
subprocedure 
that calls ZhbGetVar and returns the answer in one of its own parameters 
instead 
of as a return value.  Instead of calling ZhgGetVar, you will call your 
subprocedure.  Then, you will assign that value obtained by your subprocedure 
to 
the target variable.

Below is sample code (not a complete program; just relevant pieces).  You would 
need this only in programs that make hundreds of calls to ZhbGetVar and/or 
other 
subprocedures that return a value with a long length.

A variable for the value:
D v32K            s          32767    varying

The subprocedure's prototype
D MyGetVar        pr
D  varname                      50          const varying options(*varsize)
D  varvalue                  32767          varying
D  occurrence                   10i 0       const options(*nopass)

The subprocedure's implementation
P MyGetVar        b
D MyGetVar        pi
D  varname                      50          const varying options(*varsize)
D  varvalue                  32767          varying
D  occurrence                   10i 0       const options(*nopass) 

C                   if        %parms < 3
C                   eval      varvalue = ZhbGetVar(varname:1)
C                   else
C                   eval      varvalue = ZhbGetVar(varname:occurrence)
C                   endif
P MyGetVar        e

Sample use:
C                   callp     mygetvar('custname':v32k)
C                   eval      custname = v32k

Mel Rothman, CGIDEV2 Author
Mel Rothman, Inc.


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