Experimental Physics and
Industrial Control System

Andrew Johnson <[email protected]> · Thu, 10 Jan 2013 11:04:30 -0600

Hi Jack,

Eric answered Q1, I'll tackle Q2:

On 2013-01-10 Jack Smith wrote:
> 2. Why do we need initOnce( ) in scanInit( )?

The IOC initialization code calls scanInit() at the appropriate time during 
iocInit(), the purpose of which is to initialize the dbScan subsystem, i.e. 
create data the structures it needs and start its threads.  The three local 
routines initOnce(), initPeriodic() and initEvent() that scanInit() calls 
initialize the three different kinds of scan operation supported by the dbScan 
subsystem: The initOnce() routine configures and starts the "scanOnce" thread, 
initPeriodic() counts and configures (but doesn't actually start) the periodic 
scan threads, and initEvent() configures the "scanEvent" data structures.

HTH,

- Andrew
-- 
There is no such thing as a free lunch.  When invited for lunch,
it is best to check if you are there to eat, or to be eaten.
-- Clive Robinson

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System