SignalProxy now uses thread-safe timer.

SignalProxy.py

 # -*- coding: utf-8 -*-
 from Qt import QtCore
 from ptime import time
+import ThreadsafeTimer
 
 __all__ = ['SignalProxy']
 
@@ -27,7 +28,7 @@ class SignalProxy(QtCore.QObject):
         self.signal = signal
         self.delay = delay
         self.args = None
-        self.timer = QtCore.QTimer()
+        self.timer = ThreadsafeTimer.ThreadsafeTimer()
         self.timer.timeout.connect(self.flush)
         self.block = False
         self.slot = slot

ThreadsafeTimer.py

+from pyqtgraph.Qt import QtCore, QtGui
+
+class ThreadsafeTimer(QtCore.QObject):
+    """
+    Thread-safe replacement for QTimer.
+    """
+    
+    timeout = QtCore.Signal()
+    sigTimerStopRequested = QtCore.Signal()
+    sigTimerStartRequested = QtCore.Signal(object)
+    
+    def __init__(self):
+        QtCore.QObject.__init__(self)
+        self.timer = QtCore.QTimer()
+        self.timer.timeout.connect(self.timerFinished)
+        self.timer.moveToThread(QtCore.QCoreApplication.instance().thread())
+        self.moveToThread(QtCore.QCoreApplication.instance().thread())
+        self.sigTimerStopRequested.connect(self.stop, QtCore.Qt.QueuedConnection)
+        self.sigTimerStartRequested.connect(self.start, QtCore.Qt.QueuedConnection)
+        
+        
+    def start(self, timeout):
+        isGuiThread = QtCore.QThread.currentThread() == QtCore.QCoreApplication.instance().thread()
+        if isGuiThread:
+            #print "start timer", self, "from gui thread"
+            self.timer.start(timeout)
+        else:
+            #print "start timer", self, "from remote thread"
+            self.sigTimerStartRequested.emit(timeout)
+        
+    def stop(self):
+        isGuiThread = QtCore.QThread.currentThread() == QtCore.QCoreApplication.instance().thread()
+        if isGuiThread:
+            #print "stop timer", self, "from gui thread"
+            self.timer.stop()
+        else:
+            #print "stop timer", self, "from remote thread"
+            self.sigTimerStopRequested.emit()
+        
+    def timerFinished(self):
+        self.timeout.emit()
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