spinlock: Fix ticket_spinlock::is_locked check

If multiple waiters call ::lock, next_ticket_ is pushed forward multiple times.
managarm · Nov 14, 2024 · 011c88c · 011c88c
1 parent 805d23e
commit 011c88c
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/include/frg/spinlock.hpp b/include/frg/spinlock.hpp
@@ -43,7 +43,7 @@ struct ticket_spinlock {
 
 	bool is_locked() {
 		return (__atomic_load_n(&serving_ticket_, __ATOMIC_RELAXED) + 1)
-			== __atomic_load_n(&next_ticket_, __ATOMIC_RELAXED);
+			<= __atomic_load_n(&next_ticket_, __ATOMIC_RELAXED);
 	}
 
 	void unlock() {