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Base 3.15 LSB

Base 3.15 LSB. Lesser Significant Bits in the “current” version of Base. Assemblies. Old: Manual st.cmd management Hard to do for many IOCs Using include files creates a debugging nightmare New: Create text files from numbered snippets Number in file name (phase) determines order

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Base 3.15 LSB

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  1. Base 3.15 LSB Lesser Significant Bitsin the “current” version of Base

  2. Assemblies • Old: Manual st.cmd management • Hard to do for many IOCs • Using include files creates a debugging nightmare • New: Create text files from numbered snippets • Number in file name (phase) determines order • Snippets can add to or replace a phase • Can use global and local directories(packages may install snippets in global dirs)

  3. Property events • Old situation: no monitors on metadata • GUI has to “reopen window” to update limits etc. • New situation: DBE_PROPERTY event type sends updates on metadata changes • Record type declares fields as properties of the VAL • Client subscribes to the VAL using DBR_CTRL_* and DBE_PROPERTY event flag • IOC sends updates when a property (limit etc.) changes • Fully supported by the CA Gateway

  4. Pointer Swapping for Arrays • Old way: copy data into a waveform     {epicsMutexMustLock(CirBufMutex[card][signal]);memcpy((unsigned char *) prec->bptr, (unsigned char *) m_rBuf[card][signal], (size_t)samples * sizeof(float));epicsMutexUnlock(CirBufMutex[card][signal]);} • New way: swap the pointer     {epicsMutexMustLock(priv->lock); if (prec->bptr) free (prec->bptr);prec->bptr = priv->nextBuffer; /* no memcpy! */priv->nextBuffer = NULL;epicsMutexUnlock(priv-lock);    }

  5. IOCs can bind to single NIF • Old IOCs running on hosts with multiple network interfaces were always binding to all • Creating “duplicate PV” exceptions in clients • Causing beacon traffic on unwanted networks • New IOCs can configure to bind to a subset • EPICS_CAS_INTF_ADDR_LIST=192.168.1.23 • Binding to multiple NIFs supported

  6. Sub-Arrays on the Fly • Old IOCs need a subArrayRecord to extract a partial array • New IOCs support this operation on the fly • “cagetwf.VAL[20:25]” • Client does not need to be 3.15 • Works only for gets and monitors

  7. Summary • Assemblies: create files from snippets • Property events: get updated on metadata • Pointer swap: zero-copy array device support • Selective IOC binding: keep other nets clean • Sub-Arrays on the fly: no subArrayRec needed • More things to find in the release notes: • Multicast name resolution • Drivers can directly process records • Multiple parallel callback threads on multi-core CPUs

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