Chapter 16: Fanout

1. Introduction

This record is used to trigger the processing of up to six other records. It has no associated device support.

2. Field Summary

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Field  Type       DCT  Initial  Access  Modify  Rec Proc   PP   
                                                Monitor         
--------------------------------------------------------------
VAL    LONG       No   0        Yes     Yes     No         Yes  
SELM   RECCHOICE  Yes  0        Yes     Yes     No         No   
SELN   USHORT     No   1        Yes     Yes     No         No   
SELL   INLINK     Yes  0        No      No      N/A        No   
LNK1   FWDLINK    Yes  0        No      No      N/A        No   
LNK2   FWDLINK    Yes  0        No      No      N/A        No   
LNK3   FWDLINK    Yes  0        No      No      N/A        No   
LNK4   FWDLINK    Yes  0        No      No      N/A        No   
LNK5   FWDLINK    Yes  0        No      No      N/A        No   
LNK6   FWDLINK    Yes  0        No      No      N/A        No   
--------------------------------------------------------------

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Name Summary Description
--------------------------------------------------------------------------------------------
VAL Value Field This field exits only because every record type must have
a VAL field so that dNameToAddr succeeds when a field
name is not specified.
SELM Select Mechanism: SELECT_ALL: Select all links
SELECTED: Use SELN as index (1 to 6)
MASK: Use SELN as a mask to select an arbitrary
combination of links.
SELN Link Selection If SELM=SELECT_ALL then this field is not used.
If SELM=SELECTED then this is the index (1 to 6) of the
link to select.
If SELM=MASK then this is the mask (in decimal) used to
determine the selected links. For example, if SELN=1,
then LNK1 will be processed. If SELN=3 then LNK1 and
LNK2 will be processed. If SELN=63 then all links LNK1,
LNK2, ... LNK6 will be processed.
SELL Link Selection SELN is read from SELL. SELL can be a constant, a
Location database link, or a channel access link.
LNK1,...,LNK6 Link Selection Link selection forward links are always processed in
Forward Links numeric order. That is LNK1 is always processed before
LNK2, LNK2 before LNK3, etc.
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4. Record Support Routines

init_record

This routine initializes SELN with the value of SELL, if SELL type is CONSTANT link, or creates a channel access link if SELL type is PV_LINK.

process

See next section.

5. Record Processing

Routine process implements the following algorithm:

PACT is set to TRUE.
The link selection SELN is fetched.
Depending on the selection mechanism, the link selection forward links are processed. and UDF is set to FALSE.
Check to see if monitors should be invoked.
- Alarm monitors are invoked if the alarm status or severity has changed.
- NSEV and NSTA are reset to 0.
Scan forward link if necessary, set PACT FALSE, and return.

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