Awake the pool client outside the critical section

diff --git a/psycopg3/psycopg3/pool.py b/psycopg3/psycopg3/pool.py
index 358203ec5e4d0ff385053753e0ba506af2ee429c..b4a9eaf17986c79c718dbba4a3bf6df2a48e7948 100644 (file)
--- a/psycopg3/psycopg3/pool.py
+++ b/psycopg3/psycopg3/pool.py
@@ -148,14 +148,18 @@ class ConnectionPool:
         # Critical section: if there is a client waiting give it the connection
         # otherwise put it back into the pool.
         with self._lock:
+            pos: Optional[WaitingClient] = None
             if self._waiting:
-                # Give the connection to the client and notify it
+                # Extract the first client from the queue
                 pos = self._waiting.popleft()
-                pos.set(conn)
             else:
-                # No client waiting for a connection: put it back into the queue
+                # No client waiting for a connection: put it back into the pool
                 self._pool.append(conn)
 
+        # If we found a client in queue, give it the connection and notify it
+        if pos:
+            pos.set(conn)
+
     def _reset_transaction_status(self, conn: Connection) -> None:
         """
         Bring a connection to IDLE state or close it.