[#390] Address review comments

Author: elfenpiff

examples/rust/event_multiplexing/wait.rs

@@ -46,7 +46,7 @@ fn main() -> Result<(), Box<dyn std::error::Error>> {
     // attach all listeners to the waitset and store the guard
     for (service, listener) in &listeners {
         let guard = waitset.attach_notification(listener)?;
-        listener_attachments.insert(guard.to_attachment_id(), (service, listener));
+        listener_attachments.insert(AttachmentId::from_guard(&guard), (service, listener));
         guards.push(guard);
     }
 

iceoryx2-bb/posix/tests/file_descriptor_set_tests.rs

@@ -156,7 +156,7 @@ fn file_descriptor_set_timed_wait_works() {
 }
 
 #[test]
-fn file_descriptor_set_blocking_wait_works() {
+fn file_descriptor_set_blocking_wait_immediately_returns_notifications() {
     let socket_name = generate_socket_name();
 
     let sut_receiver = UnixDatagramReceiverBuilder::new(&socket_name)

iceoryx2/src/port/waitset.rs

@@ -26,7 +26,7 @@
 //!     One example is a sensor that shall send an update every 100ms and the applications requires
 //!     the sensor data latest after 120ms. If after 120ms an update
 //!     is not available the application must wake up and take counter measures. If the update
-//!     arrives already after 78ms, the timeout is reset back to 120ms.
+//!     arrives within the timeout, the timeout is reset back to 120ms.
 //! * **Tick** - An interval after which the [`WaitSet`](crate::port::waitset::WaitSet)
 //!     wakes up and informs the user that the interval time has passed by providing a tick.
 //!     This is useful when a [`Publisher`](crate::port::publisher::Publisher) shall send an
@@ -280,6 +280,25 @@ pub struct AttachmentId<Service: crate::service::Service> {
     _data: PhantomData<Service>,
 }
 
+impl<Service: crate::service::Service> AttachmentId<Service> {
+    /// Creates an [`AttachmentId`] from a [`Guard`] that was returned via
+    /// [`WaitSet::attach_interval()`], [`WaitSet::attach_notification()`] or
+    /// [`WaitSet::attach_deadline()`].
+    pub fn from_guard(guard: &Guard<Service>) -> Self {
+        match &guard.guard_type {
+            GuardType::Tick(t) => AttachmentId::tick(guard.waitset, t.index()),
+            GuardType::Deadline(r, t) => AttachmentId::deadline(
+                guard.waitset,
+                unsafe { r.file_descriptor().native_handle() },
+                t.index(),
+            ),
+            GuardType::Notification(r) => AttachmentId::notification(guard.waitset, unsafe {
+                r.file_descriptor().native_handle()
+            }),
+        }
+    }
+}
+
 impl<Service: crate::service::Service> PartialEq for AttachmentId<Service> {
     fn eq(&self, other: &Self) -> bool {
         self.attachment_type == other.attachment_type
@@ -379,25 +398,6 @@ where
     guard_type: GuardType<'waitset, 'attachment, Service>,
 }
 
-impl<'waitset, 'attachment, Service: crate::service::Service>
-    Guard<'waitset, 'attachment, Service>
-{
-    /// Extracts the [`AttachmentId`] from the guard.
-    pub fn to_attachment_id(&self) -> AttachmentId<Service> {
-        match &self.guard_type {
-            GuardType::Tick(t) => AttachmentId::tick(self.waitset, t.index()),
-            GuardType::Deadline(r, t) => AttachmentId::deadline(
-                self.waitset,
-                unsafe { r.file_descriptor().native_handle() },
-                t.index(),
-            ),
-            GuardType::Notification(r) => AttachmentId::notification(self.waitset, unsafe {
-                r.file_descriptor().native_handle()
-            }),
-        }
-    }
-}
-
 impl<'waitset, 'attachment, Service: crate::service::Service> Drop
     for Guard<'waitset, 'attachment, Service>
 {