Function core_foundation_sys::runloop::CFRunLoopObserverCreate

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