code: def synchronize(self):
      check(cl.clFinish(self.queue))
      self.pending_copyin.clear()
  
imports: from __future__ import annotations
  from typing import Tuple, Optional, List
  import ctypes, functools, hashlib
  import gpuctypes.opencl
  from tinygrad.helpers import init_c_var, to_char_p_p, from_mv, OSX, DEBUG
  from tinygrad.dtype import ImageDType
  from tinygrad.codegen.kernel import LinearizerOptions
  from tinygrad.renderer.cstyle import OpenCLRenderer
  from tinygrad.device import Compiled, LRUAllocator
label_desc: Use image node_id 2 for calling the CLDevice obj's underlying member method code with example usage: obj.synchronize() without return types