Acquire microscope lock for state and settings IO

openflexure_microscope/microscope.py

@@ -153,6 +153,7 @@ class Microscope:
         Return:
             dict: Dictionary containing complete microscope state
         """
+        with self.lock:
             state = {"camera": self.camera.state, "stage": self.stage.state}
             return state
 
@@ -160,6 +161,7 @@ class Microscope:
         """
         Applies a settings dictionary to the microscope. Missing parameters will be left untouched.
         """
+        with self.lock:
             logging.debug("Microscope: Applying settings: {}".format(settings))
 
             # If attached to a camera
@@ -197,6 +199,7 @@ class Microscope:
         This is to ensure that settings for currently disconnected hardware
         don't get removed from the settings file.
         """
+        with self.lock:
 
             settings_current = {
                 "id": self.id,
@@ -341,7 +344,7 @@ class Microscope:
             )
 
         # Gether metadata from hardware in a greenlet
-        gevent.spawn(self.add_metadata_to_capture, output, metadata, annotations, tags)
+        gevent.get_hub().threadpool.spawn(self.add_metadata_to_capture, output, metadata, annotations, tags)
 
         logging.info(f"Finished capture to {output.file}")