Avoid iterating over all sockets to remove dead sockets

kernel/libs/aster-bigtcp/src/boolean_value.rs

@@ -0,0 +1,32 @@
+// SPDX-License-Identifier: MPL-2.0
+
+/// Defines a struct representing a boolean value.
+///
+/// In some cases, it is beneficial to use a struct instead of
+/// a plain boolean value to clarify the semantics.
+/// This macro provides a convenient way to define a struct
+/// that represents a boolean value.
+#[macro_export]
+macro_rules! define_boolean_value {
+    (
+        $(#[$attr:meta])*
+        $name: ident
+    ) => {
+        $(#[$attr])*
+        #[derive(Debug, Clone, Copy)]
+        pub struct $name(bool);
+
+        impl $name {
+            pub const TRUE: Self = Self(true);
+            pub const FALSE: Self = Self(false);
+        }
+
+        impl core::ops::Deref for $name {
+            type Target = bool;
+
+            fn deref(&self) -> &Self::Target {
+                &self.0
+            }
+        }
+    };
+}