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New SNL Ideas

New SNL Ideas. Possible Next Steps Ron Chestnut – PSI, May, 2001 With ideas from B. Dalesio and M. Clausen. Already new in 3.14 M. Kraimer, Eric Norum, Janet Anderson. Works on Solaris, RTEMS, Linux, Windows too?

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New SNL Ideas

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  1. New SNL Ideas Possible Next Steps Ron Chestnut – PSI, May, 2001 With ideas from B. Dalesio and M. Clausen

  2. Already new in 3.14M. Kraimer, Eric Norum, Janet Anderson • Works on Solaris, RTEMS, Linux,Windows too? • SEQ shell now optional+m option for main() generation-i option for suppressing ioccrf registration (also C++ implications) • Minor changes to distribution

  3. SNL User Variable Server • Must support dynamic load, kill, and reload • Use “Serve” verb in place of “Assign” • Add “Metadata” specification for use by Serve • Need SEQCA task to serve variables for all SNL programs on an IOC

  4. Syntax Metadata q {Precision=3,Display Low=10,Engineering Units=“Erg”,MALM=20}; Metatadata r {Display High=200}; Float x; Serve x as “snl:xyz:good” using q; Long y; Serve y as “snl:abc:ok” using r; Double z[20]; Serve z as “snl:array” using q; Normal macro replacements supported as well.

  5. Metadata • English, not database abbreviations • Display High/Low • Precision • Engineering units • Waveform lengths • Any ENUM data • More???

  6. More internal functions • pvServeCount (like pvAssignCount) • pvServed (like pvAssigned) • pvServe (like pvAssign)This runtime capability would probably be deferred until later.

  7. SEQCA – the real server • Register data from initializing SNL programs • Communicate with individual SNL programs via pipes? • Clean up on SNL crash or disconnect • All updates via pvGet and pvPut for served variables (no monitor!) • No explicit reference to individual fields

  8. SEQCA – a picture CA Server pvGet pvGet pvPut pvPut SNL #1 SNL #2

  9. Work Involved • Do a real design • Syntax support, code generation • SEQCA task development

  10. Serving SNL Internals • Some data now available only through seqShow taskid andseqChanShow taskid • Name, #state sets, #channels, #assigned, #served, #connected • For each state set: Name, current state, previous state, elapsed time since transition • For each channel: Name, Unexpanded name, Assigned?, Connected?, Served?

  11. Example names for internals(better ideas gladly taken) • IOC_name:SNC:nprograms (integer) • IOC_name:SNC:program (array of strings) • IOC_name:SNC:program:nSS (array of ints) • IOC_name:SNC:program:nchan (array of ints) • IOC_name:SNC:prog_N:SS:name (array of strings) • IOC_name:SNC:prog_N:SS:cur_state (array of strings) • IOC_name:SNC:prog_N:ch:name (array of strings) • IOC_name:SNC:prog_N:ch:assigned ( array of ints) Where _N,ch,SS and IOC_name are automatic

  12. Mechanics of internals’ serving • SEQCA again does all the real work • Add table similar to user variable table for accessing internals OR • Append internals table to user variable table.Both require restructuring of structures containing the internals’ data.This is all, of course, read-only.

  13. Discussion • This all seems doable – just a matter of time (Cubs win series? Sun burns out?) • Need feedback • We can possibly do the syntax and internals changes at SLAC. Others need to design and implement SEQCA.

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