Re: state notation code flags

[Patrick Thomas <thomas_p@ligo-wa.caltech.edu>]

Hi Mark,

Are the flags on a monitored variable set whenever the monitored 
variable is used in the code, including a pvPut, pvGet, assignment, 
calculation, or print statement? Is there a way to test if the flag is 
set besides an efTest in a when statement?
Thank you,
Patrick

Mark Rivers wrote:
> Hio Patrick,
>
> Here are some code snippets from one of my SNL programs.  It has a variable nelements assigned to a PV, and a monitor on that PV.  It has an event flag, nelementsMon that is synced to nelements.  Whenever nelements changes the event flag will be set.  In the init state I clear the event flag, just to be sure it is clear when the SNL code starts running (after all PVs connect).  I then use efTestAndClear in a when statement to take actions when that event flag is set, and to clear it.  This works fine for me.
>
> int     nelements;   assign nelements    to "{P}{R}Nelements.VAL";
> monitor nelements;
> evflag nelementsMon;    sync nelements  nelementsMon;
>
>
>     /* Initialize things when first starting */
>     state init {
>         when() {
>             /* Clear all event flags */
> ...
>
>             efClear(nelementsMon);
>         } state monitor_inputs
>     }
>
>
> ...
>
>     state monitor_inputs {
>
> ...
>
>         when(efTestAndClear(nelementsMon) && (nelements>=1)) {
>             /* If nelements changes, then change endPulses to this value,
>              * since this is what the user normally wants.  endPulses can be
>              * changed again after changing nelements if this is desired. */
>             if (moveMode == MOVE_MODE_RELATIVE)
>                 endPulses = nelements;
>             else
>                 endPulses = nelements-1;
>             pvPut(endPulses);
>         } state monitor_inputs
>     }
>
> Mark
>
> ________________________________
>
> From: tech-talk-bounces@aps.anl.gov on behalf of Patrick Thomas
> Sent: Wed 9/30/2009 10:35 PM
> To: tech-talk@aps.anl.gov
> Subject: state notation code flags
>
>
>
> Hi,
>
> I was wondering if there is a way to track at what point in the state
> notation code evflags are getting set and cleared, or if someone could
> clarify under what conditions they get set. I'm having trouble with them
> getting set somewhere and not being cleared, but I'm not sure where.
>
> Thank you,
> Patrick
>
>
>