Re: Only one instance of program.

["James H H Lampert" <jamesl@xxxxxxxxxxx>]

"Venkateshwar" <venkateshwar.raman@xxxxxxxxx> wrote:
> Is there anyway by which I can ensure that only one 
> instance of a program is running? This program generates a
> number and there is chance that it can be
> called by 2 programs to generate number and there is a 
> chance both can get same number.


"Instance of a program." Hmm. Technically, on an AS/400, 
there's never more than one "instance of a program" in 
memory at a time.

Of course, there could be many *activations* of a program 
in memory at a time, each with its own static and dynamic 
storage.

At any rate, I would imagine that all you should need to 
do is have it get an exclusive lock on something as soon 
as it starts executing, and release the lock just before 
it returns.

--
JHHL