Function js_sys::Atomics::wait

pub fn wait(
    typed_array: &Int32Array, 
    index: u32, 
    value: i32
) -> Result<JsString, JsValue>

The static Atomics.wait() method verifies that a given position in an Int32Array still contains a given value and if so sleeps, awaiting a wakeup or a timeout. It returns a string which is either “ok”, “not-equal”, or “timed-out”. Note: This operation only works with a shared Int32Array and may not be allowed on the main thread.

MDN documentation