1 / 13

New SNL Ideas

Explore the addition of Serve verb and Metadata specification in SNL for dynamic loading, killing, and reloading of variables, supporting waveforms, and ENUM data. Discuss the necessity for SEQCA task to serve variables and the potential additions to internal functions.

genevievecastro
Download Presentation

New SNL Ideas

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  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.

More Related