io_uring: add debounce future

src/io_uring/debounce.rs

@@ -0,0 +1,33 @@
+use {
+    crate::{io_uring::IoUringData, utils::numcell::NumCell},
+    std::{cell::Cell, future::poll_fn, rc::Rc, task::Poll},
+};
+
+pub struct Debouncer {
+    pub(super) cur: NumCell<u64>,
+    pub(super) max: u64,
+    pub(super) iteration: Cell<u64>,
+    pub(super) ring: Rc<IoUringData>,
+}
+
+impl Debouncer {
+    #[expect(dead_code)]
+    pub async fn debounce(&self) {
+        let iteration = self.ring.iteration.get();
+        if self.iteration.replace(iteration) != iteration {
+            self.cur.set(0);
+        }
+        if self.cur.fetch_add(1) > self.max {
+            poll_fn(|ctx| {
+                if self.ring.iteration.get() > iteration {
+                    Poll::Ready(())
+                } else {
+                    self.ring.yields.push(ctx.waker().clone());
+                    Poll::Pending
+                }
+            })
+            .await;
+            self.cur.set(0);
+        }
+    }
+}