[Frontend][Core] Add shutdown timeout - allowing in-flight requests to finish (#34730)

Signed-off-by: Mark McLoughlin <markmc@redhat.com>
Co-authored-by: Claude Sonnet 4.5 <noreply@anthropic.com>

vllm/v1/engine/coordinator.py

@@ -104,8 +104,10 @@ class DPCoordinator:
         """Returns tuple of ZMQ input address, output address."""
         return self.coord_in_address, self.coord_out_address
 
-    def close(self):
-        self._finalizer()
+    def shutdown(self, timeout: float | None = None) -> None:
+        """Shutdown coordinator process with configurable timeout."""
+        if self._finalizer.detach() is not None:
+            shutdown([self.proc], timeout=timeout)
 
 
 class EngineState: