process: Allow BBUIEventQueue to exit cleanly

Currently the monitoring thread exits with some error code or runs indefinitely. Allow
closure of the pipe its monitoring to have the thread exit cleanly/silently.

Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

1 files changed, 8 insertions, 3 deletions

diff --git a/lib/bb/server/process.py b/lib/bb/server/process.py
index 8a7c43160..3d9077fd0 100644
--- a/lib/bb/server/process.py
+++ b/lib/bb/server/process.py
@@ -499,9 +499,14 @@ class BBUIEventQueue:
     def startCallbackHandler(self):
         bb.utils.set_process_name("UIEventQueue")
         while True:
-            self.reader.wait()
-            event = self.reader.get()
-            self.queue_event(event)
+            try:
+                self.reader.wait()
+                event = self.reader.get()
+                self.queue_event(event)
+            except EOFError:
+                # Easiest way to exit is to close the file descriptor to cause an exit
+                break
+        self.reader.close()
 
 class ConnectionReader(object):