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Channel Access Enhancements

Channel Access Enhancements. J. Hill. R3.14 Enhancements. Large array support in the portable server nearly complete a priority for SNS Port syntax for EPICS_CA_ADDR_LIST coded and documented File descriptor manager based clients Work correctly with multi-threaded CA client library

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Channel Access Enhancements

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  1. Channel Access Enhancements J. Hill

  2. R3.14 Enhancements • Large array support in the portable server • nearly complete • a priority for SNS • Port syntax for EPICS_CA_ADDR_LIST • coded and documented • File descriptor manager based clients • Work correctly with multi-threaded CA client library • Sequence number in the IOC's server beacons • eliminates false beacon anomaly positives when there is questionable routing configuration. • recently added also to portable server. • Many bugs fixed

  3. R3.14 Enhancements • New epicsSingleton class • eliminates compiler and OS specific chicken an egg problems during startup when file scope C++ objects reference each other • The first class to use an object safely initializes it once only • New epicsGuard class • locks in its constructor and unlocks in its destructor • Failures where an error path out of a function neglects to unlock are eliminated. • Low level functions that require a lock • epicsGuard reference in their arguments. This helps to eliminate deadlock problems by more clearly documenting the lock hierarchy. • WIN32 mutex locking runs probably two to three times faster than before

  4. 3.14 Tasks Remaining • Slay bug detected by change links test • GDD issues occurring when testing large array modifications to the portable server

  5. R3.15 Plans • Data Access Interface replaces GDD in the portable server • Data Access Interface in the emerging upgraded client API. • Portable server is now select() scheduled with a structure allowing also thread scheduling • Support only thread scheduling in the future

  6. R3.15 – R3.16 • New subscription dispatching mechanisms • Time based triggering • Maximum period • Minimum period • Fixed period • PV event triggered • Download simple expression into the server • Possibly follow the example of the CALC record

  7. R3.15 – R3.16 Plans • Protocol enhancements • Support for generalized containers specified at run time by data access • Support for new subscription triggering mechanisms • Improved density • Documentation • Directory service • Integrated LDAP? • Protocol versioning

  8. R3.15 – R3.16 Plans • Better source code commonality between client and server libraries • Virtual circuits • Quality of service parameters

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