Experimental Physics and
Industrial Control System

Thanks again for the help.  I have found another issue, though, and I sincerely apologize if it is yet another fundamental C error.  Can anybody shed any light on why Program 1 shown below does work while Program 2 does not even successfully compile?  I have highlighted the only differences between the two programs with "***************".

Program 1:

/* Sample Program */
program sncExample

option +r; /* reentrant */

float i;   ***********

float pv;
assign pv to "testioc:magnet{mag}";

%{

    void helloWorld(SS_ID ssId, struct UserVar *pVar) {
        pVar->i = 1;   ****************
        printf("Hello World! You have just called a C function, and the variable i is %5.1f \n", pVar->i);
    }

}%

ss ss1 {

   state one {
       when() {
       %% helloWorld(ssId, pVar);
       pv = 1;
       pvPut(pv);
       sleep(1);
       } state two
   }

   state two {
       when () {
       %% helloWorld(ssId, pVar);
       pv = 2;
       pvPut(pv);
       sleep(1);
       } state one
   }

}



Program 2:

/* Sample Program */
program sncExample

option +r; /* reentrant */

float i = 1; ****************

float pv;
assign pv to "testioc:magnet{mag}";

%{

    void helloWorld(SS_ID ssId, struct UserVar *pVar) {
        printf("Hello World! You have just called a C function, and the variable i is %5.1f \n", pVar->i);
    }

}%

ss ss1 {

   state one {
       when() {
       %% helloWorld(ssId, pVar);
       pv = 1;
       pvPut(pv);
       sleep(1);
       } state two
   }

   state two {
       when () {
       %% helloWorld(ssId, pVar);
       pv = 2;
       pvPut(pv);
       sleep(1);
       } state one
   }

}


The error message displayed upon compiling program 2 is :

./../sncExample.stt: In function ‘helloWorld’:
./../sncExample.stt:15: error: ‘struct UserVar’ has no member named ‘i’
./../sncExample.stt: In function ‘A_ss1_one’:
./../sncExample.stt:24: error: ‘struct UserVar’ has no member named ‘pv’
./../sncExample.stt:26: warning: implicit declaration of function ‘sleep’
./../sncExample.stt: In function ‘A_ss1_two’:
./../sncExample.stt:33: error: ‘struct UserVar’ has no member named ‘pv’
./../sncExample.stt: At top level:
./../sncExample.stt:50: error: ‘struct UserVar’ has no member named ‘pv’


Thanks everybody!

Brad Pietrzak

On Mon, Sep 26, 2011 at 6:02 PM, J. Lewis Muir <[email protected]> wrote:

On 9/26/11 4:39 PM, Bradley Pietrzak wrote:
> Thank you again for your responses.  Unfortunately, I have encountered
> another problem, this time involving code that has been escaped to C.  The
> new version of my program is shown below.  Without the re-entrant option,
> the code runs perfectly fine.  With the re-entrant option, however, I am met
> with several errors. The SNL user's manual says that the SNC automatically
> refers to variables in the struct UserVar by running the code " pVar->xxx",
> but that such references have to be handled manually for escaped C code. How
> do I handle such situations manually?

Hi, Brad.

In your example, you would need to do:

 %% helloWorld(pVar->i);

Or, if you are wanting to do more things within your helloWorld
function, you could call it like this:

 %% helloWorld(ssId, pVar);

with the function changed to:

 void helloWorld(SS_ID ssId, struct UserVar *pVar) {

   printf("Hello World! You have just called a C function, "

     "and the variable i is %5.1f \n", pVar->i);
 }

Lewis