xous: thread_parking: fix logic on wakeup race

When waking up a thread and there's a race condition, the logic may be inverted. Or the thread may time out, in which case there is no thread to wake up. Signed-off-by: Sean Cross <[email protected]>
betrusted-io · Dec 24, 2023 · feb0bdd · feb0bdd
1 parent 722c218
commit feb0bdd
Showing 1 changed file with 2 additions and 1 deletion.
diff --git a/library/std/src/sys/xous/thread_parking.rs b/library/std/src/sys/xous/thread_parking.rs
@@ -83,7 +83,8 @@ impl Parker {
             TicktimerScalar::NotifyCondition(self.index(), 1).into(),
         )
         .expect("failed to send NotifyCondition command")[0]
-            == 1
+            != 1
+            && self.state.load(Acquire) != EMPTY
         {
             // The target thread hasn't yet hit the `WaitForCondition` call.
             // Yield to let the target thread run some more.