Experimental Physics and
Industrial Control System

"Erik Johansson" <[email protected]> · Mon, 20 Oct 2008 11:40:31 -1000

Hi Zen,

When using the +r option, all variables are part of a structure. Use the
pointer "pVar" to access them, for example:

pVar-> foo

This is described in the SNL manual in the section on syntax (Section 5,
pg 20 in rev 1.9).

Erik 

> -----Original Message-----
> From: [email protected] 
> [mailto:[email protected]] On Behalf Of Szalata, Zenon M.
> Sent: Monday, October 20, 2008 11:06 AM
> To: EPICS Techtalk
> Subject: Difficulties with my Sequencer program
> 
> I am using seq-R2-0-11 and vxWorks 6.6.
> I have written a simple sequencer program, which monitors a 
> PV and when the epics record processes, it saves the data 
> from the PV to a disk file.  The data written to disk is an 
> ascii coded string, which contains configuration data for a 
> VME module.  All of this works flawlessly with one module.
> I have a few such modules and I want to keep the 
> configuration data in separate files, so this is what I tried:
> 1. I have coded my sequencer program such that I pass to it 
> information using a macro, which is used to select which PV 
> to monitor and get data from and what file name to use.
> 2. I start a few instances of the same program, one for each module.
> 
> I realized that this does not work.  Looking at the manual 
> for clues I see that the program must be made reentrant.  
> Hence, I added option +r; to my program, but now it does not 
> compile.  Here are some details:
> 
> In the program I have a few routines written in C coded as 
> escaped to C.  In the declaration part of the program I 
> define a few variables, e.g. int update;. With the option +r; 
> statement added, the C escaped routines no longer have access 
> to the variables declared in the declaration part.  I get a 
> number of error messages like:
> 
> "../sncFFF.st:120: error: 'update' undeclared (first use in 
> this function)"
> 
> When I examine the sncFFF.c code generated with the +r option 
> and without, I do not see any significant difference.
> 
> I am stuck now and any help or suggestions will be greatly 
> appreciated.
> 
> Zen
> 
> 

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System