fix-bug: mbapy/web_utils/task.py: TaskPool: _run_process_loop: sleep …

…sleep_while_empty for empty queue handling to avoid busy waiting

- Introduce sleep_while_empty parameter to handle empty queue scenario
- Add sleep logic when thread result queue is empty to prevent busy waiting

mbapy/web_utils/task.py

@@ -269,6 +269,7 @@ def __init__(self, mode: str = 'async', n_worker: int = None,
         self.MODE = mode
         self.N_WORKER = n_worker
         self.IS_STARTED = False
+        self.sleep_while_empty = sleep_while_empty
         self._async_loop: asyncio.AbstractEventLoop = None
         self._thread_task_queue: Queue = Queue()
         self._thread_result_queue: Queue = Queue()
@@ -317,6 +318,8 @@ def _run_process_loop(self):
                         except Exception as e:
                             self._thread_result_queue.put((task_name, e, TaskStatus.NOT_SUCCEEDED))
                         del tasks_cache[task_name]
+                time.sleep(self.sleep_while_empty)
+            time.sleep(self.sleep_while_empty)
         pool.close()
 
     def _run_isolated_process_loop(self):