add lock to soundlib volume utility

soundLib.py

@@ -2,7 +2,7 @@
 Implements all sound functionality
 '''
 import logging, os, hashlib, queue, time, psutil
-from threading import Event
+from threading import Event, RLock
 from exceptionThreading import ExceptionThread, async
 from pygame import mixer
 from subprocess import call
@@ -114,6 +114,7 @@ class SoundLib:
 		
 		self._ttsQueue = queue.Queue()
 		self._stopper = Event()
+		self._lock = RLock()
 
 	def start(self):
 		self._startMonitor()
@@ -137,6 +138,7 @@ class SoundLib:
 		
 	@async(daemon=False)
 	def _fader(self, lowerVolume, totalDuration, fadeDuration=0.2, stepSize=5):
+		with self._lock:
 			alarm = self.soundEffects['triggered']
 			alarmVolume = alarm.volume
 			alarmVolumeDelta = alarmVolume - lowerVolume
@@ -168,6 +170,7 @@ class SoundLib:
 	
 	# will not change sounds that have preset volume
 	def _applyVolumesToSounds(self, volume):
+		with self._lock:
 			self.volume = volume
 			v = volume/100
 			s = self.soundEffects