Experimental Physics and
Industrial Control System

"Mark Rivers" <[email protected]> · Mon, 20 Oct 2008 16:37:38 -0500

When you compile with +r the calls to your C functions are different.  There are a couple of extra parameters passed.  

Here's an example C function in .st file with option +r

static int waitMotors(SS_ID ssId, struct UserVar *pVar)

It is described in the documentation, but I can send examples if you need them.

Mark

________________________________

From: [email protected] on behalf of Szalata, Zenon M.
Sent: Mon 10/20/2008 4:06 PM
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