PI68997: S-FUNCTION SCHEDULING ISSUE WITH RHAPSODY TIMERS

IBM Rational Rhapsody 8.2

APAR status

• Closed as program error.

Error description

• Description:
  
  The customer is using timers in their Simulink integration, but
  the times are a mismatch to the Rhapsody timer. Here is their
  description:
  ----
  "In the attached model I am exporting a class with a
  statemachine as an s-function, and execute it in Simulink. The
  statemachine is triggered by a 20 ms timer, and it runs in
  Simulink with a sample time of 10 ms. The statemachine is simply
  flipping a variable from 0 to 1 and from 1 to 0 every 20 ms. I
  am tracing the value of the variable in Simulink. The
  expectation would be to have a periodic signal, having 2 '1' and
  2 '0' . Unfortunately, it seems that there are some anomalies in
  the sequence, and this suggests a problem in the way rhapsody
  timers are managed in the S-Function.
  
  Could you look at the model and clarify why the output does not
  match
  my expectations?
  
  The attached model shows an issue we have noticed in a
  production
  model, and it is impacting the completion of the SQA phase."
  ----
  
  They were asked to try to do a test using just Rhapsody, but
  could not find a way to accurately judge.
  
  ---
  "I don't know how to do a meaningful test in Rhapsody. In
  Simulink I notice the issue because I am comparing the Simulink
  time with the Rhapsody timer, and I can notice that there is a
  mismatch. If I just run it in Rhapsody, it is like trying to
  catch a time mismatch without having another time source to
  compare with.  "
  ---
  
  
  Environment:
  
  Rhapsody 8.1.3
  Simulink 2013B
  
  
  Attachment:
  
  
  
  Model attached
  
  Simulink model is in DefaultComponent/Default Config
  
  It is a very simple model; there is a S-Function with 1 output,
  sent to a block that logs the output. The output is the variable
  flipping between 0 and 1 every 20 ms.
  

Local fix

Problem summary

• ****************************************************************
  * USERS AFFECTED:                                              *
  * Rhapsody users                                               *
  ****************************************************************
  * PROBLEM DESCRIPTION:                                         *
  * S-function scheduling issue with rhapsody timers.            *
  * Timer inaccuracy is caused by casting from double to integer *
  * value.                                                       *
  ****************************************************************
  * RECOMMENDATION:                                              *
  ****************************************************************
  

Problem conclusion

• Fixed in Rhapsody 8.2 - The problem is fixed in
  Share\etc\SFunctionTemplates\C++\RhapSFuncTempl.cpp and
  Share\etc\SFunctionTemplates\C\RhapSFuncTempl.c files
  

Temporary fix

Comments

APAR Information

• APAR is sysrouted FROM one or more of the following:

• APAR is sysrouted TO one or more of the following:

Fix information

• Fixed component name

  TLOGIC RHAPSODY

• Fixed component ID

  5724V74RP

Applicable component levels

• R813 PSN

     UP