Re: Question about opening and closing files

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)

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