feat(kernel): WatchDeath + SetTimer events as notification signals; adapter wakes at earliest deadline

crates/domain/src/timer_tests.rs

@@ -0,0 +1,37 @@
+use super::{Target, Timers};
+use types::{badge::Badge, generation::Generation, id::NotificationId, id::ProcessId, time::Ticks};
+
+fn target(n: u16) -> Target {
+    Target {
+        notification: NotificationId::from_raw(n),
+        generation: Generation::initial(),
+        badge: Badge::NONE,
+    }
+}
+
+fn pid(n: u16) -> ProcessId {
+    ProcessId::from_raw(n)
+}
+
+#[test]
+fn only_expired_timers_fire_and_each_fires_once() {
+    let mut t = Timers::new();
+    t.set(pid(0), Ticks::from_raw(10), target(0));
+    t.set(pid(1), Ticks::from_raw(30), target(1));
+    assert_eq!(t.earliest(), Some(Ticks::from_raw(10)));
+    assert_eq!(t.take_expired(Ticks::from_raw(9)), None);
+    assert_eq!(t.take_expired(Ticks::from_raw(10)), Some(target(0)));
+    assert_eq!(t.take_expired(Ticks::from_raw(29)), None);
+    assert_eq!(t.earliest(), Some(Ticks::from_raw(30)));
+}
+
+#[test]
+fn setting_again_replaces_and_clear_cancels() {
+    let mut t = Timers::new();
+    t.set(pid(2), Ticks::from_raw(10), target(0));
+    t.set(pid(2), Ticks::from_raw(50), target(1));
+    assert_eq!(t.take_expired(Ticks::from_raw(20)), None);
+    t.clear(pid(2));
+    assert_eq!(t.earliest(), None);
+    assert!(!t.set(pid(500), Ticks::from_raw(1), target(0)));
+}