Re: Question about opening and closing files

[Scott Klement <rpg400-l@xxxxxxxxxxxxxxxx>]

Hi Charles,

> Why couldn't it?  A trigger program is a *PGM object, you can call
> programs from service programs.  

Yes, I know that :)


> By the time the signal handler ran,
> the trigger program should be off the call stack, so recursion
> wouldn't be an issue.

Recursion is what I was concerned about, since the service program 
would've been called by the trigger, calling the trigger again would 
create recursion.

You say it'd be off the call stack --- and that didn't occur to me. 
But, you might be right about that.   Actually, I don't know.  I could 
envision you being right about it -- but I can also envision you being 
wrong, since even though the trigger isn't currently running in the call 
stack, it's still activated in memory -- and I thought the fact that RPG 
uses static variables in it's activation is the reason you can't 
recurse...?  Without trying it, I don't know which of those two ways of 
thinking is the right one :)

But, even if you're right, there's still a chance that the signal 
handler could fire in the blink of an eye between the time that the 
trigger was called again (because of an update to a successive record) 
and the time it resets the alarm() counter, thus still causing a conflict.

A callback would be simpler, IMHO, since it wouldn't have to deal with 
reinvoking the whole program.