add some definitions to readme

boilerplates-concurrency/daemon_example.py

@@ -0,0 +1,39 @@
+#!/usr/bin/env python3
+
+import time
+import sys
+import multiprocessing
+
+
+def daemon():
+    p = multiprocessing.current_process()
+    print('Starting: {}, {}'.format(p.name, p.pid))
+
+    sys.stdout.flush()
+    time.sleep(1)
+    print('Exiting : {}, {}'.format(p.name, p.pid))
+
+    sys.stdout.flush()
+
+
+def non_daemon():
+    p = multiprocessing.current_process()
+    print('Starting: {}, {}'.format(p.name, p.pid))
+
+    sys.stdout.flush()
+    print('Exiting : {}, {}'.format(p.name, p.pid))
+
+    sys.stdout.flush()
+
+
+
+if __name__ == '__main__':
+    d = multiprocessing.Process(name='daemon', target=daemon)
+    d.daemon = True
+
+    n = multiprocessing.Process(name='non-daemon', target=non_daemon)
+    n.daemon = False
+
+    d.start()
+    time.sleep(1)
+    n.start()