From: Mike Wilson <wmwilson01@...>
Date: 2004-02-27T01:41:12+09:00
Subject: Need some thread help

I'm having some trouble with this code.  I can't figure out where to do the 
thread.join at.  Please excuse the extremely ugly code.

<code>
....snip....

threads = []
check_status = proc {
    $labels.each_key do |aHost|
        threads << Thread.new(aHost) do |host|
            if $look[host] == 1
                if system("ping #{host} 4 > /dev/null 2>&1")
                   ....snip....
                else
                   ....snip....
                end
            end
        end
        # tried to join here, but remained very sequential.
    end
    # tried to join here, but had a bunch of "deadlock" stuff happen.
    updater.configure('text' => "Last update: " + 
Time.new.strftime(DATE_FORMAT + ":%S"))
    Tk.after(tknm_interval, &check_status)
}
check_status.call
threads.each do |t| t.join end
Tk.mainloop()
</code>

Now, the "threads.each do |t| t.join end" currently doesn't work (probably 
obvious).  I know this because the memory stack size increases with every 
loop (which is what I would expect when you keep adding threads without them 
ever "join"ing back), except that if I put the join just inside the 
"labels.each" loop, no actual threading occurs (it acts sequentially).  
Sorry for my bad code and stupidity. :O)  Any help would be appreciated.

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