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# CFRunLoopRun()

Runs the current thread’s CFRunLoop object in its default mode indefinitely.

```
func CFRunLoopRun()
```

## Discussion

The current thread’s run loop runs in the default mode (see [Default Run Loop Mode](/documentation/CoreFoundation/default-run-loop-mode)) until the run loop is stopped with [`CFRunLoopStop(_:)`](/documentation/CoreFoundation/CFRunLoopStop(_:)) or all the sources and timers are removed from the default run loop mode.

Run loops can be run recursively. You can call [`CFRunLoopRun()`](/documentation/CoreFoundation/CFRunLoopRun()) from within any run loop callout and create nested run loop activations on the current thread’s call stack.

---

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