From: "Lars M." <lars-m@...>
Date: 2003-01-22T01:23:27+09:00
Subject: [Threads + Sockets] Strange behavior

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Hi,

I attached a really simple and short script. If you run it, it works as
expected.

If you comment the bottom and uncomment the part directly above, however, it
does not work as expected anymore, it does not execute the block of code
simultanously 10 times anymore - it waits until one socket is finished and
then another thread continues execution.

It seems the socket is not local to the block of code - that maybe why the
other threads don't touch it until it is closed (when the block of code is
finished) -> maybe they all share _one_ socket, but I do not think that is
what is happening.

So if the socket is not local to the block of code, how can I make it local?

Thanks for any help in advance.

Ciao,

-Lars

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require 'socket'

class ThreadingGroup
	def initialize nThreads
		@threads = Array.new
		@nThreads = nThreads
	end
	
	def start code
		1.upto @nThreads do
			@threads.push(Thread.start {code.call})
		end
		
		done = false
		while not done
			done = true
			0.upto @nThreads  - 1 do |index|				
				if @threads[index].alive?
					done = false
					break
				end
			end
		end
	end
end

#~ @group = ThreadingGroup.new 10
	#~ @group.start proc{
					#~ begin
						#~ puts 'start'
						#~ socket = TCPSocket.open('<invalid>', 80)
						#~ socket.close
					#~ ensure
						#~ puts 'done'
					#~ end
				#~ }
				
	@group = ThreadingGroup.new 10
	@group.start proc {
					puts 'start'
					sleep 5
				}
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