Ensure pipe is_alive is set before triggering event or condition

src/scheme/pipe.rs

@@ -102,17 +102,15 @@ impl KernelScheme for PipeScheme {
         let scheme_id = GlobalSchemes::Pipe.scheme_id();
 
         let can_remove = if is_write_not_read {
-            event::trigger(scheme_id, key, EVENT_READ);
-
-            pipe.read_condition.notify(token);
             pipe.writer_is_alive.store(false, Ordering::SeqCst);
+            event::trigger(scheme_id, key, EVENT_READ);
+            pipe.read_condition.notify(token);
 
             !pipe.reader_is_alive.load(Ordering::SeqCst)
         } else {
-            event::trigger(scheme_id, key | WRITE_NOT_READ_BIT, EVENT_WRITE);
-
-            pipe.write_condition.notify(token);
             pipe.reader_is_alive.store(false, Ordering::SeqCst);
+            event::trigger(scheme_id, key | WRITE_NOT_READ_BIT, EVENT_WRITE);
+            pipe.write_condition.notify(token);
 
             !pipe.writer_is_alive.load(Ordering::SeqCst)
         };