pub unsafe extern "C" fn aws_bus_unsubscribe(
    bus: *mut aws_bus,
    address: u64,
    listener: aws_bus_listener_fn,
    user_data: *mut c_void
)
Expand description

Unsubscribe a listener from a specific message. This is only necessary if the listener has lifetime concerns. Otherwise, the listener will be called with an address of AWS_BUS_ADDRESS_CLOSE, which indicates that user_data can be cleaned up if necessary and the listener will never be called again.