Thanks for the "Set Control Value" tip. I was using a "call by reference" node
to initialize the child vi. Seems one can not intermix the "call by reference"
and the "invoke node" blocks in this case????? When I used the "Set Control
Value" things ran as expected.
thanks
again,
--
Bill --
Jean-Pierre Drolet wrote:
> The method you described should work as you expect.
>
> When you open the child.vi copy and use "Run VI" method, the child runs by
> itself as a top VI.
> After it is finished, its VI reference must be closed to release it from
> memory and the file copy eventually deleted.
> The child.vi can do this before it exits if you pass to it its own VI
> reference (I use "Set Control Value") from the parent.vi.
> Then when the child.vi task is finished, it can delete its file copy ( using
> "Get VI path" method) and close its VI reference.
> Make sure that closing the VI reference is the last thing you do in the VI
> since the close halts the VI execution and release it from memory.
>
> Jen-Pierre Drolet
> Scientech R&D inc.
>
> William R. Doggett a �crit dans le message :
> 38F38ECD.C4B01402@larc.nasa.gov...
> > Hello,
> >
> > I'm running LV 5.1.1 on a W98 PC.
> > I'd like to know how to programmatically start another thread from
> > within labview. I.e. is there anyway to duplicate the unix fork?
> >
> > I'd like to build a server (parent.vi) in labview that receives a
> > request, starts a vi (child.vi) to handle the request and spawns it off
> > as a low priority task/thread so that the server may continue to process
> > additional incoming requests. When child.vi is complete it
> > exits/terminates.
> > I've looked into the vi server documentation and attempted a trick
> > Greg M. mentioned ... copying the child.vi to a new name, loading it and
> > executing it, but this forces a loop in the server to keep track of the
> > children and call them sequentually. As some tasks are quick, others
> > longer, I'd sure like to just let each child.vi run independently and
> > terminate when finished.
> >
> > all
> > suggestions welcome,
> > thanks,
> >
> > -- Bill --
> >