From: "Kurt M. Dresner" <kdresner@...>
Date: 2003-07-17T02:25:40+09:00
Subject: Re: Using threads to obtain a value

If the computation is just raw computation, I don't think you're going
to see very much of a speedup by doing them in parallel.  If they are
blocking for I/O or something like that at all, then there would be an
improvement, but otherwise not.  Where is fetchdata getting the
information from?  A remote source?

-Kurt

On Wed, Jul 16, 2003 at 06:26:35PM +0900, Robert Klemme wrote:
> 
> My first approach would be this:  Create a condition variable and a mutex,
> start all threads giving them the condition var and mutex, wait on the
> condition var in the main thread.  In all threads if the value is
> retrieved signal the condition var.  In the main thread kill all non
> terminated threads (or simply let them run) and proceed.
> 
>     robert
> 
> 
> 
> "Zachary P. Landau" <kapheine@hypa.net> schrieb im Newsbeitrag
> news:e81e52a8.0307151130.5bd9ab91@posting.google.com...
> > I have a few classes that all try to obtain the same data as each
> > other using different methods. Each one takes around 5 seconds to get
> > the data, so I'd much rather have them all try to get it at once. I
> > only need the data once, from whoever gets it first.
> >
> > So what I would like to do is have, lets say, fetchdata() for each
> > class called in a thread, and as soon as the first non-nil is returned
> > from fetchdata, I want to kill the other threads and go on with the
> > program.
> >
> > I have read the threading documentation and tried to play around a bit
> > with it, but I can't seem to get it to do what I want. If someone
> > could tell me how to do it or give me a point in the right direction,
> > that'd be helpful.
> 
> 
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