From ee4965f4d4d1fc5d40be24b99341620e32386d40 Mon Sep 17 00:00:00 2001
From: Christian Kolset <ckolset@colostate.edu>
Date: Mon, 27 Jul 2026 17:34:30 -0600
Subject: Enhance protocol layers: implement I/O locking for thread safety in
 serial communication

---
 api_layers/protocols/base_protocol.py | 1 +
 1 file changed, 1 insertion(+)

(limited to 'api_layers/protocols/base_protocol.py')

diff --git a/api_layers/protocols/base_protocol.py b/api_layers/protocols/base_protocol.py
index 096151d..bb45d6b 100644
--- a/api_layers/protocols/base_protocol.py
+++ b/api_layers/protocols/base_protocol.py
@@ -30,6 +30,7 @@ class BaseProtocol(ABC):
 
         self._cache:  Dict[str, float]          = {}
         self._lock    = threading.Lock()
+        self._io_lock = threading.Lock()  # guards self._ser — shared by poll thread and write() callers
         self._running = False
         self._thread: Optional[threading.Thread] = None
         self._ser     = None
-- 
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