Re: Question about opening and closing files

Charles,

Why should trigger programs end with *INLR=*ON?

Thanks,

Crispin.

----- Original Message ----- From: "Charles Wilt" <charles.wilt@xxxxxxxxx>
To: "RPG programming on the AS400 / iSeries" <rpg400-l@xxxxxxxxxxxx>
Sent: Tuesday, September 09, 2008 10:59 AM
Subject: Re: Question about opening and closing files

No of course not.

But a trigger program should never be ended with *LR = *OFF anyway.

So alarm() might work.

Charles

On Tue, Sep 9, 2008 at 10:03 AM, Lim Hock-Chai
<Lim.Hock-Chai@xxxxxxxxxxxxxxx> wrote:

Are you saying that the alarm() api can actually wake up an in-active
program (ended with *inlr = *off)? That would be cool if this is true
:).




"Charles Wilt" <charles.wilt@xxxxxxxxx> wrote in message
news:<mailman.9454.1220926197.2545.rpg400-l@xxxxxxxxxxxx>...

Pretty big I'd guess....but it should be easy enough to test for

yourself..

(Maybe) a better idea:
Come up with a way to have the trigger program wake up after a few
minutes and close its files. This way, if your changing 100s of
records at a time, you'll only have to pay for one open/close.

Question is how to do the wake up?
First thought is to use alarm() API along with the appropriate signal
handling APIs.

BUT I don't know that trigger's play well with signals...don't know
they don't either. <grin>

Another possibly easier option:
Look at why is the file open an issue in the first place. Can you
make it not an issue? For instance, once place I've had trouble is
with a process that uses CLRPFM to clear a work file when that process
is called by an ODBC/JDBC client. Instead of a CLRPFM, I sometimes
will use an SQL DELETE. Or I'll change the program reading the file
to delete the record after it reads it. Consider adding
REUSEDLT(*YES) to the file.

HTH,
Charles





On Mon, Sep 8, 2008 at 8:47 PM, James Lampert

<jamesl@xxxxxxxxxxxxxxxxx> wrote:

> How much overhead would you say is involved in making files *USROPN,

and

> keeping them open only while actually performing I/O on them, as

opposed

> to doing things the usual way?
>
> We're thinking of doing this in a trigger program, in order to cut

back

> on the number of file locks.
>
> --
> James H. H. Lampert
> Touchtone Corporation
>
> --
> This is the RPG programming on the AS400 / iSeries (RPG400-L)

mailing list

> To post a message email: RPG400-L@xxxxxxxxxxxx
> To subscribe, unsubscribe, or change list options,
> visit: http://lists.midrange.com/mailman/listinfo/rpg400-l
> or email: RPG400-L-request@xxxxxxxxxxxx
> Before posting, please take a moment to review the archives
> at http://archive.midrange.com/rpg400-l.
>
>

--
This is the RPG programming on the AS400 / iSeries (RPG400-L) mailing list
To post a message email: RPG400-L@xxxxxxxxxxxx
To subscribe, unsubscribe, or change list options,
visit: http://lists.midrange.com/mailman/listinfo/rpg400-l
or email: RPG400-L-request@xxxxxxxxxxxx
Before posting, please take a moment to review the archives
at http://archive.midrange.com/rpg400-l.

--
This is the RPG programming on the AS400 / iSeries (RPG400-L) mailing list
To post a message email: RPG400-L@xxxxxxxxxxxx
To subscribe, unsubscribe, or change list options,
visit: http://lists.midrange.com/mailman/listinfo/rpg400-l
or email: RPG400-L-request@xxxxxxxxxxxx
Before posting, please take a moment to review the archives
at http://archive.midrange.com/rpg400-l.