Experimental Physics and
Industrial Control System

"Brown, David L." <[email protected]> · Fri, 7 Nov 2014 17:24:41 +0000

True 56 bytes is expected if I were defining a char or string, but I
thought I was assigning a number of elements in an array in this case and
not the size of the array in bytes.  Code below should read PV1 == TRUE,
sorry.  

Dave

On 11/7/14, 12:15 PM, "Eric Norum" <[email protected]> wrote:

>double foo[7];
>size_t s = sizeof foo;
>
>An almost any machine architecture now in use it is expected that s would
>be 56 ‹ 7 elements, 8 bytes each.
>
>Also ‹ is the code below an accurate copy?  The if statement contains an
>assignment, not a conditional.
>
>
>> On Nov 7, 2014, at 9:02 AM, Brown, David L. <[email protected]> wrote:
>> 
>> Hi, all,
>> 
>> I got around the problem.  I don¹t know why this is, but when one
>>defines
>> an array size of 7 elements (like as seen below), assigns them to an
>>array
>> of three elements outside the state machine, and then reassigns the
>> elements inside the state machine, there is no core dump.  I also looked
>> at the size of the array MPS and it said that my array was a size of 56
>>as
>> opposed to the 7 elements I defined.  I have convinced myself that this
>> was a memory allocation problem as the array size (as interpreted by the
>> state machine) was different than what I expected it to be.  Perhaps I
>> have a fundamental misunderstanding of how to initially assign variables
>> in C?  Thank you all for your help and tips.  Here is the working code I
>> referenced above (still needs testing, but core dumps don¹t happen):
>> 
>> char fcoutpreamble[40];
>> char fcokpreamble[40];
>> 
>> char blah[40];
>> int i;
>> double MPS[7];
>> assign
>> {
>> 	³PV1²,
>> 	³PV2²,
>> 	³PV3²
>> }
>> 
>> Monitor MPS;
>> 
>> SS Machine
>> {
>> 	state Start
>> 	{
>> 		when()
>> 		{
>> 			if( PV1 = TRUE)
>> 			{
>> 				/* set arguments here*/
>> 				i = sprintf(blah, ³%s_input\n²,fcoutpreamble);
>> 				assert( i <= sizeof(blah));
>> 				pvAssign (MPS[2],blah);
>> 				i = sprintf(blah, ³%s_raw\n²,fcoutpreamble);
>> 				assert( i <= sizeof(blah));
>> 				pvAssign (MPS[3],blah);
>> 				i = sprintf(blah, ³%s_input\n²,fcokpreamble);
>> 				assert( i <= sizeof(blah));
>> 				pvAssign (MPS[4],blah);
>> 				i = sprintf(blah, ³%s_raw\n²,fcokpreamble);
>> 				assert( i <= sizeof(blah));
>> 				pvAssign (MPS[5],blah);
>> 				i = sprintf(blah, ³PV3²);
>> 				assert( i <= sizeof(blah));
>> 				pvAssign (MPS[6],blah);
>> 			}
>> 
>> 			else
>> 			{
>> 				/* set arguments here*/
>> 			}
>> 		}state Idle
>> 	}
>> }
>> 
>> Dave				
>> 
>
>-- 
>Eric Norum
>[email protected]
>
>
>
>

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System