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20468750
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2013-12-09T10:53:06.820
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2013-12-09T11:07:08.937
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2013-12-09T11:07:08.937
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<blockquote> starting from Rails 4, everything would have to run in threaded environment by default </blockquote> This is not 100% correct. Threadsafe Rails is just on by default. If you still deploy on a multi-process app server like passenger(community) or unicorn there will be no difference at all. This change only concerns you, if you deploy on a multi-threaded environment like Puma or Passenger Enterprise > 4.0 In the past if you wanted to deploy on a multi-threaded app server you had to turn on config.threadsafe, which is default now, because all it did had either no effects or also applied to a rails app running in a single process (<a href="http://tenderlovemaking.com/2012/06/18/removing-config-threadsafe.html">Prooflink</a>). But if you do want all the rails 4 <a href="http://blog.phusion.nl/2012/08/03/why-rails-4-live-streaming-is-a-big-deal/">streaming</a> benefits and other real time stuff of the multithreaded deployment then maybe you will find <a href="http://m.onkey.org/thread-safety-for-your-rails">this</a> article interesting. As @Theo sad, for a rails app, you actauly just have to omit mutating static state during a request. While this a simple practice to follow, unfortionatly you cannot be sure about this for every gem you find. As far as i remember Charles Oliver Nutter from the Jruby project had some tipps about it in <a href="http://rubyrogues.com/124-rr-jruby-with-charlie-nutter/">this</a> podcast. And if you want to write a pure concurrent ruby programming, where you would need some data structures which are accessed by more than one thread you maybe will find the <a href="https://github.com/headius/thread_safe">thread_safe</a> gem usefull
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1. POhow to know what is NOT thread-safe in ruby?
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