libcamera: camera_manager: Bind CameraManager to threads

The CameraManager class uses the event dispatcher of the current thread.
This makes the CameraManager::eventDispatcher() and
CameraManager::setEventDispatcher() methods inconsistent, as they access
different event dispatcher instances depending on the calling thread.

Fix this by inheriting from the Object class, which binds the
CameraManager to a thread, and use the event dispatcher of the bound
thread.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Jacopo Mondi <jacopo@jmondi.org>
Reviewed-by: Niklas Söderlund <niklas.soderlund@ragnatech.se>

include/libcamera/camera_manager.h

@@ -11,6 +11,8 @@
 #include <string>
 #include <vector>
 
+#include <libcamera/object.h>
+
 namespace libcamera {
 
 class Camera;
@@ -18,7 +20,7 @@ class DeviceEnumerator;
 class EventDispatcher;
 class PipelineHandler;
 
-class CameraManager
+class CameraManager : public Object
 {
 public:
 	int start();