From: "Andrew S. Townley" <andrew.townley@...>
Date: 2005-08-29T22:50:55+09:00
Subject: Re: Associating a name with a thread?


Hi Robert & Logan,

I went ahead and already have a "NamedThread" class (not particularly
exciting):

  # Hack to provide a name to the thread so we can see where
  # all of these critters are comming from.
 
  class NamedThread < Thread
    def initialize(name, *args)
      super(*args)
      @name = name
    end
 
    def to_s
      "#{@name}:#{super}"
    end
 
    def inspect
      "#{@name}:#{super}"
    end
 
    attr_accessor :name
  end

This tells me that I've created as many threads as I expect, however
there are still a large number of threads that are created elsewhere
that don't have names.  I suppose this is the wrong approach because I
really want to know who created them and where.  I guess I'll run the
whole thing with trace and see what I get.

I had hoped I wasn't missing anything obvious.  Question though:  if I
re-open the Thread class to add a name attribute, does that apply to
all, pre-existing threads or just new ones?  There are 2 others that I
know about, but...

Anyway, thanks for the quick responses.

ast

On Mon, 2005-08-29 at 14:41, Logan Capaldo wrote:
> On Aug 29, 2005, at 9:19 AM, Andrew S. Townley wrote:
> 
> >
> > Hi.  Me again.
> >
> > I'm doing some research/work using threads with ruby.  I saw this  
> > in the
> > ri docs for Thread#inspect:
> >
> > ---------------------------------------------------------  
> > Thread#inspect
> >      thr.inspect   => string
> > ---------------------------------------------------------------------- 
> > --
> >      Dump the name, id, and status of _thr_ to a string.
> >
> > And was wondering how you assign a meaningful name to a thread.  Right
> > now, I have about 2X as many threads created as I would've thought
> > (using Thread.list.length).  Desk-checking the code doesn't show
> > anything obvious, but I have instrumented it to the point that I have
> > output with the Thread information, e.g.
> >
> > #<Thread:0xb7f94e94>: doing something
> >
> > But, what I want is to be able to do something like
> >
> > task1 = Thread.new("task1") { ... }
> >
> > or at least
> >
> > task1 = Thread.new { ... }
> > task1.name = "task1"
> >
> > to get it to show up during execution.
> >
> > Maybe I'm going about this the wrong way.  Any pointers in the right
> > direction would be appreciated.
> >
> > Cheers,
> >
> > ast
> >
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> 
> Well I can't find anything that seems to indicate that threads have  
> this functionality, but you have two choices:
> 
> 1) Subclass thread and add a name method.
> 2) Add a name method to thread.
> 
> either way it would proabably look like:
> 
> class Thread # or NamedThread < Thread
>             attr_accessor :name
>             alias __old__thread__inspect inspect # not neccessary if  
> subclassing thread
>             def inspect
>                   inspection = __old_thread__inspect # or inspection  
> = super if subclassing
>                  unless @name.nil?
>                        inspection.sub(Regexp.new("^#<#{class.name}:)0x 
> [a-fA-F0-9]+")) { |match| match + @name}
>                   else
>                        inspection
>                   end
>             end
> end
> 
> 
> 

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