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Date: Fri, 24 Apr 2015 00:13:33 +0000
From: Eric Wong <e@80x24.org>
To: Jason Hines <jason@greenhell.com>
Cc: unicorn-public@bogomips.org
Subject: Re: Will restarting a Unicorn process (via HUP signal) wait for
 worker threads?
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Jason Hines <jason@greenhell.com> wrote:
> In my application, I have some background jobs which are executed in
> separate threads.  (using SuckerPunch/Celluloid framework)
> 
> If I send a HUP signal to the Unicorn master, the application is reloaded
> and gracefully restarts the workers.    But, if those workers have child
> threads, does Unicorn wait for those threads to finish before the restart
> or are they terminated immediately?

unicorn itself does not know about any threads spawned by the application.

However, you can setup an END/at_exit block in the worker to wait on
those threads since unicorn workers perform graceful exit:

	at_exit do
	  join_all_threads
	end