Ejemplo n.º 1
0
// placeholder used to track class loading internal states
// placeholder existence now for loading superclass/superinterface
// superthreadQ tracks class circularity, while loading superclass/superinterface
// loadInstanceThreadQ tracks load_instance_class calls
// definer() tracks the single thread that owns define token
// defineThreadQ tracks waiters on defining thread's results
// 1st claimant creates placeholder
// find_and_add adds SeenThread entry for appropriate queue
// All claimants remove SeenThread after completing action
// On removal: if definer and all queues empty, remove entry
// Note: you can be in both placeholders and systemDictionary
// see parse_stream for redefine classes
// Therefore - must always check SD first
// Ignores the case where entry is not found
void PlaceholderTable::find_and_remove(int index, unsigned int hash,
                       symbolHandle name, Handle loader, Thread* thread) {
    assert_locked_or_safepoint(SystemDictionary_lock);
    PlaceholderEntry *probe = get_entry(index, hash, name, loader);
    if (probe != NULL) {
       // No other threads using this entry
       if ((probe->superThreadQ() == NULL) && (probe->loadInstanceThreadQ() == NULL)
          && (probe->defineThreadQ() == NULL) && (probe->definer() == NULL)) {
         remove_entry(index, hash, name, loader);
       }
    }
  }
Ejemplo n.º 2
0
// placeholder is used to track class loading internal states
// placeholder existence now for loading superclass/superinterface
// superthreadQ tracks class circularity, while loading superclass/superinterface
// loadInstanceThreadQ tracks load_instance_class calls
// definer() tracks the single thread that owns define token
// defineThreadQ tracks waiters on defining thread's results
// 1st claimant creates placeholder
// find_and_add adds SeenThread entry for appropriate queue
// All claimants remove SeenThread after completing action
// On removal: if definer and all queues empty, remove entry
// Note: you can be in both placeholders and systemDictionary
// Therefore - must always check SD first
// Ignores the case where entry is not found
void PlaceholderTable::find_and_remove(int index, unsigned int hash,
                                       Symbol* name, ClassLoaderData* loader_data,
                                       classloadAction action,
                                       Thread* thread) {
    assert_locked_or_safepoint(SystemDictionary_lock);
    PlaceholderEntry *probe = get_entry(index, hash, name, loader_data);
    if (probe != NULL) {
       probe->remove_seen_thread(thread, action);
       // If no other threads using this entry, and this thread is not using this entry for other states
       if ((probe->superThreadQ() == NULL) && (probe->loadInstanceThreadQ() == NULL)
          && (probe->defineThreadQ() == NULL) && (probe->definer() == NULL)) {
         remove_entry(index, hash, name, loader_data);
       }
    }
  }