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Site updated at 2017-01-16 11:53:18 UTC

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<p>On September 29, 2016 we released <a href="https://home-assistant.io/blog/2016/09/29/async-sleepiq-emoncms-stocks/">Home Assistant 0.29</a> as part of our bi-weekly release schedule. This release introduced a complete overhaul of the core spearheaded by <a href="https://github.com/bbangert/">Ben Bangert</a>.</p>
<p>The old core was set up like a “traditional” threaded application. Each resource that was not thread safe (ie. the state of entities) would be protected by a lock. This caused a lot of waiting and potential inconsistency because a task could now end up waiting halfway through it’s job until some resource got freed.</p>
<p>The old core was set up like a “traditional” threaded application. Each resource that was not thread safe (ie. the state of entities) would be protected by a lock. This caused a lot of waiting and potential inconsistency because a task could now end up waiting halfway through its job until some resource got freed.</p>
<p>Our new core is based on an Python’s built-in asyncio module. Instead of having all threads have access to the core API objects, access is now limited to a special thread called the event loop. All components will now schedule themselves as a task to be executed by the event loop. This gives us the guarantee that only one task is executed at once, meaning we no longer need any locks.</p>