From: Craig Williams <craig@...80.com>
Date: 2009-03-16T08:55:19+09:00
Subject: Re: Keep thread in memory

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thanks everyone - I found the Daemons wrapper and a simple loop was well
simple :) and it works great.

I also know what ctrl-z does now .... learning is fun ;-)

-c

On Sun, Mar 15, 2009 at 6:29 PM, Craig Williams <craig@ip80.com> wrote:

> thanks Robert,
>
> A simple loop..do will work and yes, a daemon is what I want to create.
> I'll
> look it up and see if I can find some theory around this in Ruby. I should
> have said a TSR right ;-)
>
> Is it good practice in Ruby to sleep when in an infinite loop? or will Ruby
> protect me from that kind of issue?
>
> thanks,
>
> -c
>
>
> On Sun, Mar 15, 2009 at 6:22 PM, Robert Klemme
> <shortcutter@googlemail.com>wrote:
>
> > On 15.03.2009 22:35, Craig Williams wrote:
> >
> >> [Note:  parts of this message were removed to make it a legal post.]
> >>
> >> 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
> >>
> >
> > First of all, why are you using a thread here?  Do you have other work
> that
> > needs to be done concurrently?
> >
> >  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?
> >>
> >
> > Depends on the condition.  If you want this to run indefinitely you can
> > simply do
> >
> > loop do
> >  ...
> > end
> >
> >  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.
> >>
> >
> > "Go into memory"???  All programs are executed in memory.  What you
> > probably rather need is a demon, i.e. a program that continues to work
> even
> > if the terminal gets removed (ssh close).
> >
> >  I tried leaving off the server_thread.join but then it just quits. Could
> >> someone explain exactly what Thread.start is doing here.
> >>
> >
> > In your example above the thread is completely superfluous since you do
> not
> > do anything concurrently.  A plain old infinite loop would do the same
> job.
> >  Basically your code is equivalent to
> >
> > PORT = 1234
> > server = UDPSocket.open
> > server.bind("127.0.0.1", PORT)
> >
> > 100.times { #do something }
> >
> > Kind regards
> >
> >        robert
> >
> >
>

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