Macro multi_threaded

macro_rules! multi_threaded {
    () => { ... };
    (if { $($p:tt)* } else { $($n:tt)* }) => { ... };
    ($($p:tt)*) => { ... };
}

Indicates multithreading support.

This macro suppresses the provided code because #[cfg(all(not(target_arch = "wasm32"), feature = "multi_threaded"))] is not currently active.