try avoid camera deadlock

swissmx.py

@@ -45,7 +45,7 @@ ts=timestamp()
 ts.log('Import part 1/8:')
 import sys, os, time
 import json, re
-import random, signal
+import random, signal,threading
 
 #import Wigis #ZAC: orig. code
 #import jungfrau_widget #ZAC: orig. code
@@ -217,6 +217,8 @@ class StartupSplash:
 Ui_MainWindow, QMainWindow = loadUiType("swissmx.ui")
 
 class WndSwissMx(QMainWindow, Ui_MainWindow):
+  sigNewCamImg = pyqtSignal()  # index in self._grids
+
   #pixelsPerMillimeter = pyqtSignal(float)
   #beamCameraCoordinatesChanged = pyqtSignal(float, float)
   addGridRequest = pyqtSignal(float, float)
@@ -629,6 +631,7 @@ class WndSwissMx(QMainWindow, Ui_MainWindow):
       event.ignore()
 
   def cb_update_center_widget(self, index):
+    _log.debug('TODO: check to not connect smultiple igNewCamImg')
     if index > 0:  # not showing camera image
       _log.warning("listening to zescape")
       self.timer.stop()
@@ -641,12 +644,16 @@ class WndSwissMx(QMainWindow, Ui_MainWindow):
       try:
         self.cb_new_frame_sim()
       except AttributeError:
+        self.sigNewCamImg.connect(self.cb_update_img)
         app._camera.run(self.cb_new_frame_pv)
 
   def cb_new_frame_pv(self, **kwargs):
-    #_log.debug('new_frame_pv_cb count {}'.format(kwargs['count']))
+    #thrd=threading.current_thread()
+    #_log.debug(f'thread:{thrd.getName()}, {thrd.native_id}')
+
     app=QApplication.instance()
-    sz=app._camera._sz
+    cam=app._camera
+    sz=cam._sz
     if kwargs['count']==sz[0]*sz[1]:
       pic=kwargs['value'].reshape(sz[::-1])
     else:
@@ -655,7 +662,18 @@ class WndSwissMx(QMainWindow, Ui_MainWindow):
     if pic.dtype==np.int16:
       pic.dtype=np.uint16
     camera.epics_cam.set_fiducial(pic, 255)
-    self._goImg.setImage(pic)
+    cam._pic=pic
+    # self._goImg.setImage(cam._pic) caused some deadlocks.
+    # therefore try to update the image with signals instead
+    self.sigNewCamImg.emit()
+
+  def cb_update_img(self):
+    #thrd=threading.current_thread()
+    #_log.debug(f'thread:{thrd.getName()}, {thrd.native_id}')
+
+    app=QApplication.instance()
+    cam=app._camera
+    self._goImg.setImage(cam._pic)
 
   def cb_new_frame_sim(self, **kwargs):
     app=QApplication.instance()