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  3. November 1999

RE: How to tell if a program is active?

  • Subject: RE: How to tell if a program is active?
  • From: David Gibbs <dgibbs@xxxxxxx>
  • Date: Tue, 23 Nov 1999 12:56:41 -0600
Title: RE: How to tell if a program is active?

> I need to make sure that a particular program is running only
> once.  I do
> not want multiple occurrences of this program to be running. 
> I'm sure my
> mind is already on Thanksgiving time since I can't seem to
> figure out how I
> can check whether a certain program is active or not.  Can
> anyone help me?

Do you mean running once in the current job or running once in the entire system?

If you mean the current job, and you want to avoid recursion, then we use a technique that sends a message to the programs message queue ... if the queue is not active, then the program is not running in the current job.  If the message is received, then the job is active.

david


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