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<== Date ==> <== Thread ==>

Subject: Re: use VxWorks task to load databases
From: jbk@aps.anl.gov (Jim B. Kowalkowski)
Date: Fri, 7 Apr 1995 07:18:32 -0500
Johnny,

> 
>   Have you thought about using a VxWorks task to load databases
> to ioc ? So that only one startup file is needed for all the iocs.
> Also it will load what ever in the specified production tree so that
> it will not be impacted by changes of products in the production
> tree.  It can be called "Dynamic Shared Directory Loading".
> 
>   Say, I have a production tree like this:
> 
>   <prod> ---- <ioc1> --- <app1> --- app1db1.database 
>            |          |             app1db2.database
>            |          |             app1.o
>            |          |- <app2> --- app2db1.database 
>            |                        app2db2.database
>            |                        app2.o
>            |              . . .
>            |
>            |- <ioc2> --- <app1> --- app1db1.database 
>                       |             app1db2.database
>                       |             app1.o
>                       |- <app3> --- app3db1.database 
>                                     app3db2.database
>                                     app3.o
>                           . . .
>          . . . . . .
> 
>   Let me know how do you think about this.
> 

It could work like this without to much trouble:

------------------------------------------------
 # startup file for all the iocs 
 ld  < epics/iocCore
 ld  < epics/drvSup
 ld  < epics/recSup
 ld  < epics/devSup
 ld  < epics/seq
 .
 .
 .
 dbLoad "default.dctsdr"
 rcmd(xx,xx,xx,xx,"make_pattern_file")
 dbLoadTemplate "the_pattern_file"
 .
 .
 .
 iocInit
------------------------------------------------

Where make_pattern_file is a script that runs on the workstation that
looks like this:

------------------------------------------------
#!/bin/sh

if [ -e the_pattern_file ]
then
 exit 0
fi

find $app_top -name "*.db" -print |
	awk '{ print "file " $1 }' > the_pattern_file

------------------------------------------------

The pattern file could now be user directly by dbLoadTemplate().  The
file the_pattern_file would look something like this:

file ../theApp/Db/my.db
file ../theApp/Db/another.db
file ../theApp/Db/yetanother.db
file ../testApp/Db/my.db
file ../testApp/Db/another.db
.
.
.

I haven't tested this or anything, it's just an idea.

Jim

---------------
Jim Kowalkowski
 Argonne National Laboratory
 Advanced Photon Source
 708/252-9410
 jim@anl.gov
 jbk@phebos.aps.anl.gov

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