Rubén Norte
d1c72016c1
Summary: Pull Request resolved: https://github.com/facebook/react-native/pull/44725 Changelog: [internal] ## Context We're currently testing synchronous state updates in Fabric (committing shadow trees for state updates synchronously in the thread where they were dispatched, instead of always scheduling it in the JS thread). In these experiments we saw a problem caused by a recent change in the Android mounting layer (done to fix a problem with the Event Loop) where we were doing the mount operations inside a mutex lock. The problem is that we didn't have recursive commit+mount operations (because we were dispatching state updates in the JS thread) but now that we do we get a deadlock here. {F1659804385} These recursive commit+mount operations happen because it's possible to trigger state updates while we mount changes in the host platform (e.g.: we create the scroll view and we update the state to set the content offset). Those state updates trigger more mount operations, which deadlock in the mentioned place. ## Changes This fixes the described issue by restricting the lock only to access the list of pending operations, but not to apply them. In the current implementation, `mountingManager->executeMount` is protected by the lock, whereas in the new version it isn't (so it can be safely called recursively). The synchronization of the mount operations is done directly at the mounting layer on Android. Reviewed By: sammy-SC Differential Revision: D57968936 fbshipit-source-id: 52f996d212cad691646610632b03b5223e7e90ca
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 13.4 and Android 6.0 (API 23) 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.