Experimental Physics and
Industrial Control System

[email protected] (Rozelle Wright) · Wed, 18 Dec 96 12:15:53 MST

> From [email protected] Wed Dec 18 11:14:27 1996
> Return-Path: <[email protected]>
> Date: Wed, 18 Dec 1996 20:12:49 +0200 (EET)
> Subject: Re: Bug in sequencer?
> To: [email protected]
> In-Reply-To: <[email protected]>
> Mime-Version: 1.0
> Content-Type> : > TEXT/plain> ; > CHARSET=US-ASCII> 
> Content-Length: 1478
> X-Lines: 77
> 
> 
> On 18 Dec, Rozelle Wright wrote:
> > 
> > ...I would like to have a sample of the sequence 
> > that you used as your example.  Could you mail it 
> > to me please...
> >
> 
> /******************** Code starts here **********************/ 
> program snctest
> float v;
> assign v to "npat:xxxExample";
> monitor v;
> 
> program snctest
> float v;
> assign v to "npat:xxxExample";
> monitor v;
> 
> ss ss1
> {
> 	state low
> 	{
> 	    when(v>5.0)
> 	    {
> 		printf("changing to high\n");
> 	    } state high
> 	    when(delay(.1)) 
> 	    {
> 	    } state low
> 	}
> 	state high
> 	{
> 	    when(v<=5.0)
> 	    {
> 		printf("changing to low\n");
> 	    } state low
> 	    when(delay(.1))
> 	    {
> 	    } state high
> 	}
> }
> /******************** Code ends here *****************************/
> 
> When I translate the sequence program using the "buggy" snc I get 
> the following c-code as result:
> 
> /* @(#)SNC Version 1.9.2: Tue Dec 17 16:09:27 EET 1996: sncExample.st */
>                 .
>                 .
>                 .              
> /* State Set Blocks */
> static struct seqSS seqSS[NUM_SS] = {
> 	/* State set "ss1"*/
> 	/* ss name */            "ss1",
> 	/* ptr to state block */ state_ss1ss1%, 	
> 	/* number of states */   2,
> 
> 	/* error state */        -1,
> };
>                .
>                .
>                .
>                
> Obviously the correct value for the `ptr to state block' would be
> just "state_ss1" and not "state_ss1ss1%"
> 
> 
> Sincerely,
>  
> Nick Patavalis  
> ([email protected]) 
> Inst. for Accelerating Systems and Apps. (IASA) 
> Athens, 18 Dec 1996.
>  
> 
> 
> 
Hi Nick,
Thanks for sending the example.  I was trying to figure out
why our testing didn't show this bug.  It's because
the printf generated by the compilers we use on solaris
and sunos4 throw away % unless it is followed by another %.
So printf("%,") generates ,
We have fixed it and Jeff Hill has checked the code in to R3.13 at APS.

It's really good to have this code tested on other operating
systems.
Rozelle

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System