Imran Shitta-Bey
68fd1e5508
Summary: In short, if an RCTEventDispatcher observer sends an event on the same thread that the observer was initially on, there will be a deadlock due to `sendEvent` already having the lock active on the `_observers` NSHashTable. An example where this occurred was when we had react-native-gesture-handler trigger an animated event, which then triggered an event on the underlying component being animated as a result of it being an observer on the animation event. Since this all occurred on the main thread, we ended up with a deadlock and the app froze. To prevent this scenario, I used a `NSRecursiveLock` for _observersLock to be able to dispatch events on the same thread from observers. joebernard ## Changelog <!-- Help reviewers and the release process by writing your own changelog entry. For an example, see: https://github.com/facebook/react-native/wiki/Changelog --> [iOS] [Fix] - Prevent deadlock when dispatching events from observers on the same thread. Pull Request resolved: https://github.com/facebook/react-native/pull/33490 Test Plan: Not sure if there are any tests present for sending events with RCTEventDispatcher already in place, but In regular app usage this solution has proved to be a viable and stable option so far and has prevented the deadlock from occurring. This would still be thread-safe since we are now allowing the event to be sent through observers on the same thread the initial event was dispatched on. The only issue I could see here is the behavior of sending an event could be changed. Reviewed By: RSNara Differential Revision: D35118752 Pulled By: charlesbdudley fbshipit-source-id: 7e93a8d49841e001b235a437ccca1e072dcc7ab1
React Native
Learn once, write anywhere:
Build mobile apps with React.
Getting Started · Learn the Basics · Showcase · Contribute · Community · Support
React Native brings React's declarative UI framework to iOS and Android. With React Native, you use native UI controls and have full access to the native platform.
- Declarative. React makes it painless to create interactive UIs. Declarative views make your code more predictable and easier to debug.
- Component-Based. Build encapsulated components that manage their state, then compose them to make complex UIs.
- Developer Velocity. See local changes in seconds. Changes to JavaScript code can be live reloaded without rebuilding the native app.
- Portability. Reuse code across iOS, Android, and other platforms.
React Native is developed and supported by many companies and individual core contributors. Find out more in our ecosystem overview.
Contents
- Requirements
- Building your first React Native app
- Documentation
- Upgrading
- How to Contribute
- Code of Conduct
- License
📋 Requirements
React Native apps may target iOS 11.0 and Android 5.0 (API 21) or newer. You may use Windows, macOS, or Linux as your development operating system, though building and running iOS apps is limited to macOS. Tools like Expo can be used to work around this.
🎉 Building your first React Native app
Follow the Getting Started guide. The recommended way to install React Native depends on your project. Here you can find short guides for the most common scenarios:
📖 Documentation
The full documentation for React Native can be found on our website.
The React Native documentation discusses components, APIs, and topics that are specific to React Native. For further documentation on the React API that is shared between React Native and React DOM, refer to the React documentation.
The source for the React Native documentation and website is hosted on a separate repo, @facebook/react-native-website.
🚀 Upgrading
Upgrading to new versions of React Native may give you access to more APIs, views, developer tools, and other goodies. See the Upgrading Guide for instructions.
React Native releases are discussed in this discussion repo.
👏 How to Contribute
The main purpose of this repository is to continue evolving React Native core. We want to make contributing to this project as easy and transparent as possible, and we are grateful to the community for contributing bug fixes and improvements. Read below to learn how you can take part in improving React Native.
Code of Conduct
Facebook has adopted a Code of Conduct that we expect project participants to adhere to. Please read the full text so that you can understand what actions will and will not be tolerated.
Contributing Guide
Read our Contributing Guide to learn about our development process, how to propose bugfixes and improvements, and how to build and test your changes to React Native.
Open Source Roadmap
You can learn more about our vision for React Native in the Roadmap.
Good First Issues
We have a list of good first issues that contain bugs which have a relatively limited scope. This is a great place to get started, gain experience, and get familiar with our contribution process.
Discussions
Larger discussions and proposals are discussed in @react-native-community/discussions-and-proposals.
📄 License
React Native is MIT licensed, as found in the LICENSE file.
React Native documentation is Creative Commons licensed, as found in the LICENSE-docs file.