Re: DECAda/VMS - calling GETJPI

[Ken Garlington <garlingtonke@lmtas.lmco.com>]

Alan Paterson wrote:
> 
> So, what I now do is the following:
> 
>    PID  : UNSIGNED_LONGWORD;
>    PID0 : INTEGER;
>    for PID0 use at PID'address;
> begin
>    PID0 := -1;
>    loop
>       GetJPI(..., Process_Id => PID, ...);
> 
> This works, but I can't help but wonder if there isn't a more
> elegant way to do it. Does anyone have experience with this?

I tried this on DEC Ada V3.0A-9 on a VAXStation 4000 running VMS 5.5-2.
I can assign -1 to objects of System.Unsigned_Longword just fine, so
long as the "-" operator is visible (e.g., put in a "use System;").

For this version of DEC Ada, System.Unsigned_Longword is defined as
range System.Min_Int .. System_Max_Int, with System.Min_Int = -(2**31).
See the DEC Ada documentation, or read file ADA$PREDEFINED:SYSTEM_.ADC.

If, on your version of DEC Ada, the range has been changed, try this:

  Minus_1 : constant System.Unsigned_Longword := System."not"(0);

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