Adds a CFRunLoopSource object to a run loop mode.


func CFRunLoopAddSource(_ rl: CFRunLoop!, _ source: CFRunLoopSource!, _ mode: CFRunLoopMode!)



The run loop to modify.


The run loop source to add. The source is retained by the run loop.


The run loop mode to which to add source. Use the constant commonModes to add source to the set of objects monitored by all the common modes.


If source is a version 0 source, this function calls the schedule callback function specified in the context structure for source. See CFRunLoopSourceContext for more details.

A run loop source can be registered in multiple run loops and run loop modes at the same time. When the source is signaled, whichever run loop that happens to detect the signal first will fire the source.

If rl already contains source in mode, this function does nothing.

See Also

Managing Sources

func CFRunLoopContainsSource(CFRunLoop!, CFRunLoopSource!, CFRunLoopMode!) -> Bool

Returns a Boolean value that indicates whether a run loop mode contains a particular CFRunLoopSource object.

func CFRunLoopRemoveSource(CFRunLoop!, CFRunLoopSource!, CFRunLoopMode!)

Removes a CFRunLoopSource object from a run loop mode.