Ensure that only one thread accesses settings.xml

Avoids corruption of settings.xml

resources/lib/utils.py

@@ -8,6 +8,7 @@ from logging import getLogger
 from sqlite3 import connect, OperationalError
 from datetime import datetime
 from unicodedata import normalize
+from threading import Lock
 try:
     import xml.etree.cElementTree as etree
     import defusedxml.cElementTree as defused_etree  # etree parse unsafe
@@ -36,6 +37,10 @@ LOG = getLogger('PLEX.utils')
 WINDOW = xbmcgui.Window(10000)
 ADDON = xbmcaddon.Addon(id='plugin.video.plexkodiconnect')
 
+# If several threads access  the settings.xml file concurrently, it gets
+# corrupted
+SETTINGS_LOCK = Lock()
+
 # Grab Plex id from '...plex_id=XXXX....'
 REGEX_PLEX_ID = re.compile(r'''plex_id=(\d+)''')
 # Return the numbers at the end of an url like '.../.../XXXX'
@@ -122,6 +127,7 @@ def settings(setting, value=None):
     setting and value can either be unicode or string
     """
     # We need to instantiate every single time to read changed variables!
+    with SETTINGS_LOCK:
         addon = xbmcaddon.Addon(id='plugin.video.plexkodiconnect')
         if value is not None:
                 # Takes string or unicode by default!