From: hemant <gethemant@...>
Date: 2006-09-18T19:15:42+09:00
Subject: handle exception thrown in nested threads from top level thread

In following code, both methos get_client_symbol and sync_clients gets
called and they start their own new threads. Now, what I would like to
do is, whenever a exception is raised from the nested threads..i would
like to catch them in the toplevel thread.

Now..I have tried many things:
 Thread.abort_on_exception = true
and using just rescue or rescue Exception or rescue RuntimeError,
however the exception raised in nested threads won't get caught in the
top level thread. Any clues?

  @threads << Thread.new do
        child_threads = []

        begin
           child_threads << get_client_symbol(temp_client_id)
           child_threads << sync_clients(temp_client_id)
          child_threads.each {|thr| p thr.to_s; thr.join; }

         rescue Exception
           p $!
           p $!.backtrace
           # delete the values from list
           @connected_clients.synchronize do
             @connected_clients.delete(temp_client_id)
             @symbols_being_added.signal
           end #end of sync
           child_threads.each {|thr| Thread.kill(thr) if thr.alive? }
         end

      end #end of threads


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