Function CFRunLoopObserverCreate 

pub unsafe extern "C-unwind" fn CFRunLoopObserverCreate(
    allocator: Option<&CFAllocator>,
    activities: CFOptionFlags,
    repeats: bool,
    order: CFIndex,
    callout: CFRunLoopObserverCallBack,
    context: *mut CFRunLoopObserverContext,
) -> Option<CFRetained<CFRunLoopObserver>>

👎Deprecated: renamed to CFRunLoopObserver::new

Available on crate feature CFRunLoop only.