code: def _ensure_debugger_port_open_thread_safe():
      """
      This is a thread safe method that ensure that the debugger port
      is open, and if not, open it.
      """
  
      # The lock is acquired before checking the debugger port so only
      # one thread can open the debugger port.
      with debugger_port_lock:
          debugpy = _try_import_debugpy()
          if not debugpy:
              return
  
          debugger_port = (
              ray._private.worker.global_worker.debugger_port
          )
          if not debugger_port:
              (host, port) = debugpy.listen(
                  (ray._private.worker.global_worker.node_ip_address, 0)
              )
              ray._private.worker.global_worker.set_debugger_port(port)
              log.info(f"Ray debugger is listening on {host}:{port}")
          else:
              log.info(
                  f"Ray debugger is already open on {debugger_port}"
              )
  
file_path: ray/python/ray/util/debugpy.py
imports: import logging
  import os
  import sys
  import threading
  import importlib
  import ray
  from ray.util.annotations import DeveloperAPI
label_desc: Use image node_id 3 for calling a global function with example usage: _ensure_debugger_port_open_thread_safe() without return types