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# dispatchMain()

Executes blocks submitted to the main queue.

```
func dispatchMain() -> Never
```

## Discussion

This function “parks” the main thread and waits for blocks to be submitted to the main queue. Applications that call <doc://com.apple.documentation/documentation/UIKit/UIApplicationMain(_:_:_:_:)-1yub7> (iOS), <doc://com.apple.documentation/documentation/AppKit/NSApplicationMain(_:_:)> (macOS), or <doc://com.apple.documentation/documentation/CoreFoundation/CFRunLoopRun()> on the main thread must not call [`dispatchMain()`](/documentation/Dispatch/dispatchMain()).

This function never returns.

---

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