Daemonize all threads to avoid breaking IOLoop exception handling (i.e tornado)

pipe_io_server/pipe_io_server.py

@@ -9,7 +9,7 @@ from .terminate_process_on_failure import terminate_process_on_failure
 
 class PipeIOServer(ABC, Thread):
     def __init__(self, in_pipe=None, out_pipe=None, permissions=0o600):
-        super().__init__()
+        super().__init__(daemon=True)
         self._in_pipe, self._out_pipe = in_pipe, out_pipe
         self._create_pipes(permissions)
         self._stop_event = Event()

pipe_io_server/pipe_reader_thread.py

@@ -11,7 +11,7 @@ class PipeReaderThread(Thread):
     stop_sequence = b'stop_reading\n'
 
     def __init__(self, pipe_path, stop_event, message_handler):
-        super().__init__()
+        super().__init__(daemon=True)
         self._message_handler = message_handler
         self._pipe_path = pipe_path
         self._stop_event = stop_event

pipe_io_server/pipe_writer_thread.py

@@ -9,7 +9,7 @@ from .deque import Deque
 
 class PipeWriterThread(Thread):
     def __init__(self, pipe_path, stop_event):
-        super().__init__()
+        super().__init__(daemon=True)
         self._pipe_path = pipe_path
         self._stop_event = stop_event
         self._write_queue = Deque()