From: Michael Malone <michael.malone@...>
Date: 2009-03-16T06:49:49+09:00
Subject: Re: Keep thread in memory

Craig Williams wrote:
> Hi,
>
> I'm writing a simple UDP listening server. It works great using this
>
> PORT = 1234
> server = UDPSocket.open
> server.bind("127.0.0.1", PORT)
>
> server_thread = Thread.start(server) do |server|
>  100.times { #do something }
> end
>
> server_thread.join
>
> The above was based off some code from the Ruby 1.9 book - I have a problem
> now trying to take it a step further.
>
> How do I get the above to run permanently or until some other condition
> besides (100) is reached?
>
> When I run this on my remote server over SSH it works but if I ctrl-z or
> exit ssh, the process seems to be in memory but isn't actually working. I'd
> like to run it and have it go into memory until it is killed and return me
> to the ssh command.
>
> I tried leaving off the server_thread.join but then it just quits. Could
> someone explain exactly what Thread.start is doing here.
>
> thanks!
> -c
>
>   
It does exactly what you think it will do.  It starts a thread, runs the 
block and exits when the block is completed.
If you want it to wait around for things to happen, like something being 
fed down a socket, you just need to make a call to an async function, 
like IO.read(server) which will wait around until there is something to 
read.

I can't explain why your process is still in memory.  To me, it should 
have exited and dropped off the face of the planet.

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