ex3_spawn_wrapper/
lib.rs

1#[macro_export]
2macro_rules! spawn_wrapper {
3    ($f:expr) => {
4        if IS_PROCESSING.with(|is_processing| is_processing.get()) {
5            return;
6        }
7        IS_PROCESSING.with(|is_processing| is_processing.set(true));
8        spawn($f);
9        IS_PROCESSING.with(|is_processing| is_processing.set(false));
10    };
11}