Implement hardware locks

openflexure_microscope/camera/base.py

@@ -19,6 +19,7 @@ except ImportError:
 from .capture import CaptureObject, capture_from_dict, BASE_CAPTURE_PATH
 from openflexure_microscope.config import USER_CONFIG_DIR
 from openflexure_microscope.utilities import entry_by_id
+from openflexure_microscope.lock import StrictLock
 
 
 def last_entry(object_list: list):
@@ -29,7 +30,6 @@ def last_entry(object_list: list):
         return None
 
 
-
 def generate_basename():
     """Return a default filename based on the capture datetime"""
     return datetime.datetime.now().strftime("%Y-%m-%d_%H-%M-%S")
@@ -87,6 +87,8 @@ class BaseCamera(object):
         self.thread = None  #: Background thread reading frames from camera
         self.camera = None  #: Camera object
 
+        self.lock = StrictLock(timeout=1)  #: Strict lock controlling thread access to camera hardware
+
         self.frame = None  #: bytes: Current frame is stored here by background thread
         self.last_access = 0  #: time: Time of last client access to the camera
         self.event = CameraEvent()