Fix React Native atomic_notify_one is unavailable

Resolving React Native 'atomic_notify_one' Unavailability Issue in Xcode 12.5

React Native is a powerful framework for building cross-platform mobile applications, but like any technology, it's not without its challenges. One such challenge arises when working with Xcode 12.5, where an issue related to atomic_notify_one can disrupt the development process. In this article, we'll explore how to address this problem and keep your React Native projects running smoothly.

Issue Details:

The error stems from a discrepancy in the usage of atomic_notify_one within the DistributedMutex-inl.h file. Specifically, the absence of the folly:: namespace qualifier triggers errors during compilation.

Solution:

To resolve this issue, follow these steps:

1. Update DistributedMutex-inl.h:
   Navigate to {project-name}/ios/Pods/Flipper-Folly/folly/synchronization/DistributedMutex-inl.h. Locate the instances of atomic_notify_one and prepend folly:: to the function call. For example:

   atomic_notify_one(state); // Change to
   folly::atomic_notify_one(state);
       

2. Update RCTCxxBridge.mm and RCTTurboModuleManager.mm:
   After making the changes in DistributedMutex-inl.h, errors may surface in RCTCxxBridge.mm and RCTTurboModuleManager.mm files. To address these:
   • RCTCxxBridge.mm (line 770): Modify the parameter type from:

     (NSArray<id<RCTBridgeModule>> *)modules

     to:

     (NSArray<Class> *)modules

   • RCTTurboModuleManager.mm (line 300): Adjust the line from:

     RCTBridgeModuleNameForClass(module))

     to:

     RCTBridgeModuleNameForClass(Class(module)));

Conclusion:

By implementing the above changes, you can successfully overcome the 'atomic_notify_one' unavailability issue encountered in React Native projects running on Xcode 12.5. These adjustments ensure compatibility with the latest Xcode version, enabling you to continue development with confidence and efficiency.

Remember to regularly check for updates and patches from the React Native community, as staying informed about potential issues and their solutions is crucial for maintaining a smooth development workflow.

Stay proactive, stay coding!

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    npx react-native run-ios --simulator="iPad (8th generation)"

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List all available iOS devices:

    xcrun simctl list devices




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