Function uikit_sys::CFRunLoopObserverCreate

pub unsafe extern "C" fn CFRunLoopObserverCreate(
    allocator: CFAllocatorRef, 
    activities: CFOptionFlags, 
    repeats: Boolean, 
    order: CFIndex, 
    callout: CFRunLoopObserverCallBack, 
    context: *mut CFRunLoopObserverContext
) -> CFRunLoopObserverRef