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Date: Thu, 24 Jul 2014 17:04:24 +0000
From: Eric Wong <e@80x24.org>
To: =?utf-8?Q?Br=C3=A1ulio?= Bhavamitra <braulio@eita.org.br>
Cc: unicorn-public <unicorn-public@bogomips.org>
Subject: Re: Old unicorn workers still receives requests?
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Bráulio Bhavamitra <braulio@eita.org.br> wrote:
> Hello all,
> 
> I would like to know if old unicorn still receives and process requests in
> a QUIT signal is sent to the old master.

During heavy traffic, yes, there's a chance due to the optimization
in worker_loop (lib/unicorn/http_server.rb):

      # make the following bet: if we accepted clients this round,
      # we're probably reasonably busy, so avoid calling select()
      # and do a speculative non-blocking accept() on ready listeners
      # before we sleep again in select().
      unless nr == 0
        tmp = ready.dup
        redo
      end

Note, "receives" requests isn't correct, workers "pull" requests from
a central queue in the kernel.