CFRunLoopAddSource(_:_:_:)
Adds a CFRunLoopSource object to a run loop mode.
Declaration
func CFRunLoopAddSource(_ rl: CFRunLoop!, _ source: CFRunLoopSource!, _ mode: CFRunLoopMode!)Parameters
- rl:
The run loop to modify.
- source:
The run loop source to add. The source is retained by the run loop.
- mode:
The run loop mode to which to add
source. Use the constant Commonmodes to addsourceto the set of objects monitored by all the common modes.
Discussion
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.