Instance Property


Adds a dispatcher for kernel callbacks to the specified run loop.


IOReturn (*addCallbackDispatcherToRunLoop)(void *self, CFRunLoopRef cfRunLoopRef);



Pointer to IOFireWireAVCLibProtocolInterface.


Reference to a run loop.

Return Value

Returns kIOReturnSuccess on success.


The user space portions of the AVC API communicate with the in-kernel services by messaging the kernel. Similarly, the kernel messages the user space services in response. These responses need to be picked up by a piece of code. This call adds that code to the specified run loop. Most drivers will call this method on the run loop that was created when your task was created. To avoid deadlock you must avoid sleeping (or spin waiting) the run loop to wait for AVC response. If you do this the dispatcher will never get to run and you will wait forever.

Beta Software

This documentation contains preliminary information about an API or technology in development. This information is subject to change, and software implemented according to this documentation should be tested with final operating system software.

Learn more about using Apple's beta software