Fixed core dumped on close

imagescanner.py

@@ -134,13 +134,11 @@ class ScannerWorker(QRunnable):
         sizes_to_check = self.target_sizes if self.target_sizes is not None \
             else SCANNER_GENERATE_SIZES
 
-        if self._is_cancelled:
-            if self.semaphore:
-                self.semaphore.release()
-            return
-
-        fd = None
         try:
+            if self._is_cancelled:
+                return
+
+            fd = None
             # Optimize: Open file once to reuse FD for stat and xattrs
             fd = os.open(self.path, os.O_RDONLY)
             stat_res = os.fstat(fd)
@@ -285,6 +283,7 @@ class CacheWriter(QThread):
         self._condition_new_data = QWaitCondition()
         self._condition_space_available = QWaitCondition()
         # Soft limit for blocking producers (background threads)
+        self.setObjectName("CacheWriterThread") # Add this line
         self._max_size = 50
         self._running = True
 
@@ -334,6 +333,7 @@ class CacheWriter(QThread):
         self._running = False
         # Do not clear the queue here; let the run loop drain it to prevent data loss.
         self._condition_new_data.wakeAll()
+        logger.debug(f"{self.objectName()} stop requested, waking all.")
         self._condition_space_available.wakeAll()
         self._mutex.unlock()
 
@@ -380,6 +380,7 @@ class CacheWriter(QThread):
                     self.cache._batch_write_to_lmdb(batch)
                 except Exception as e:
                     logger.error(f"CacheWriter batch write error: {e}")
+        logger.debug(f"{self.objectName()} run method exiting.")
 
 
 class CacheLoader(QThread):
@@ -1328,6 +1329,7 @@ class CacheCleaner(QThread):
     def stop(self):
         """Signals the thread to stop."""
         self._is_running = False
+        self.wait()
 
     def run(self):
         self.setPriority(QThread.IdlePriority)
@@ -1914,3 +1916,4 @@ class ImageScanner(QThread):
         self.mutex.lock()
         self.condition.wakeAll()
         self.mutex.unlock()
+        self.wait()