Function mi_register_output 

pub unsafe extern "C" fn mi_register_output(
    out: mi_output_fun,
    arg: *mut c_void,
)

Register an output function.

• out The output function, use None to output to stderr.
• arg Argument that will be passed on to the output function.

The out function is called to output any information from mimalloc, like verbose or warning messages.

Note: This function is thread safe.