pgrx_pg_sys

Function DefineCustomRealVariable

Source 
pub unsafe fn DefineCustomRealVariable(
    arg_name: *const c_char,
    arg_short_desc: *const c_char,
    arg_long_desc: *const c_char,
    arg_valueAddr: *mut f64,
    arg_bootValue: f64,
    arg_minValue: f64,
    arg_maxValue: f64,
    arg_context: Type,
    arg_flags: c_int,
    arg_check_hook: GucRealCheckHook,
    arg_assign_hook: GucRealAssignHook,
    arg_show_hook: GucShowHook,
)