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help with threads

Oliver Fox

6/30/2008 4:55:00 PM

hi all,
i'm trying to do some automated tasks with threads.
Basically, my app is initialized with an input file, and an output path
and some processing is done on that.
I'm trying to automatically detect when the thread dies, so that it can
tell the parent class that this thread is complete.
Is there a nice way to do this without polling every thread? I seem to
recall something relating to the Rufus::Scheduler stuff being able to do
similar, but i can't remember the name of that or where i found it. any
information would be great!

thanks,
ol.
--
Posted via http://www.ruby-....
3 Answers

Eric I.

6/30/2008 9:53:00 PM

0

On Mon, Jun 30, 2008 at 12:54 PM, Oliver Fox <olifoxpaul@googlemail.com> wrote:
> hi all,
> i'm trying to do some automated tasks with threads.
> Basically, my app is initialized with an input file, and an output path
> and some processing is done on that.
> I'm trying to automatically detect when the thread dies, so that it can
> tell the parent class that this thread is complete.
> Is there a nice way to do this without polling every thread? I seem to
> recall something relating to the Rufus::Scheduler stuff being able to do
> similar, but i can't remember the name of that or where i found it. any
> information would be great!

Hi Oliver,

Have you looked at the Monitor class and using MonitorMixin? I
believe your main thread could do a "wait_while" and your child
threads could do a "signal" when they're done to notify the main
thread.

This is assuming you have multiple child threads. If there's only
one, then doing a "join" would be easier.

I hope that helps,

Eric

====

LearnRuby.com offers Rails & Ruby HANDS-ON public & ON-SITE workshops.
Please visit http://Lea... for all the details.

Guillermo.Acilu

7/1/2008 10:23:00 AM

0

[Note: parts of this message were removed to make it a legal post.]

Hello Oliver,

I needed to do something similar than you once, but in my case I needed to
wait until all the threads were finished.

I've just looped in the main thread while the Thread.list.size was greater
than 1.

I hope this helps,

Guillermo






From:
Oliver Fox <olifoxpaul@googlemail.com>
To:
ruby-talk@ruby-lang.org (ruby-talk ML)
Date:
30.06.2008 19:00
Subject:
help with threads



hi all,
i'm trying to do some automated tasks with threads.
Basically, my app is initialized with an input file, and an output path
and some processing is done on that.
I'm trying to automatically detect when the thread dies, so that it can
tell the parent class that this thread is complete.
Is there a nice way to do this without polling every thread? I seem to
recall something relating to the Rufus::Scheduler stuff being able to do
similar, but i can't remember the name of that or where i found it. any
information would be great!

thanks,
ol.
--
Posted via http://www.ruby-....

Charles Oliver Nutter

7/1/2008 1:06:00 PM

0

Oliver Fox wrote:
> hi all,
> i'm trying to do some automated tasks with threads.
> Basically, my app is initialized with an input file, and an output path
> and some processing is done on that.
> I'm trying to automatically detect when the thread dies, so that it can
> tell the parent class that this thread is complete.
> Is there a nice way to do this without polling every thread? I seem to
> recall something relating to the Rufus::Scheduler stuff being able to do
> similar, but i can't remember the name of that or where i found it. any
> information would be great!

A thread won't die without reason. If the thread completes normally, you
can set a flag or set the thread's result to something non-nil
(Thread.current[:some_key] = result) that you can check for. If it
terminates early due to an exception, you can either rescue that
exception or let it bubble out and terminate the thread, which will set
the thread's value to the exception object.

To avoid constantly polling, you want some kind of synchronization
mechanism like those in the 'thread' library (Monitors, Semaphores, etc).

- Charlie