Function pgrx_pg_sys::add_real_reloption

pub unsafe fn add_real_reloption(
    arg_kinds: bits32,
    arg_name: *const c_char,
    arg_desc: *const c_char,
    arg_default_val: f64,
    arg_min_val: f64,
    arg_max_val: f64,
    arg_lockmode: LOCKMODE
)