code: def testMultiThreaded(self):
      insert_evs = [threading.Event() for _ in range(2)]
      insert_evs_i = 0
  
      class WRKey:
          pass
  
      class ClashingKey:
          def __eq__(self, other):
              return False
  
          def __hash__(self):
              return 333  # induce maximal caching problems.
  
      class GilReleasingCacheKey:
          def __eq__(self, other):
              nonlocal insert_evs_i
              if isinstance(
                  other, GilReleasingCacheKey
              ) and insert_evs_i < len(insert_evs):
                  insert_evs[insert_evs_i].set()
                  insert_evs_i += 1
                  time.sleep(0.01)
              return False
  
          def __hash__(self):
              return 333  # induce maximal caching problems.
  
      def CacheFn(obj, gil_releasing_cache_key):
          del obj
          del gil_releasing_cache_key
          return None
  
      cache = xla_client.weakref_lru_cache(lambda: None, CacheFn, 2048)
  
      wrkey = WRKey()
  
      def Body():
          for insert_ev in insert_evs:
              insert_ev.wait()
              for _ in range(20):
                  cache(wrkey, ClashingKey())
  
      t = threading.Thread(target=Body)
      t.start()
      for _ in range(3):
          cache(wrkey, GilReleasingCacheKey())
      t.join()
  
file_path: tensorflow/third_party/xla/xla/python/weakref_lru_cache_test.py
imports: import threading
  import time
  from absl.testing import absltest
  from xla.python import xla_client
label_desc: Use image node_id 1 for calling the WeakrefLRUCacheTest obj's underlying member method code with example usage: obj.testMultiThreaded() and returns: None, False, int, False, int