[Java筆記]Concurrency

• java.util.concurrent.atomic.*
  All classes have get and set methods that work like reads and writes on volatile variables.

 

• ReentrantLock 在進入 wait state 之前, 會暫時 release the lock.
• ReentrantLock有2個contructor
  public ReentrantLock()
  public ReentrantLock(boolean fair): the longest waiting thread will get the lock next.
• ReentrantLock 可視為一種取代傳統的 "wait-notify" 機制.

• Executor interface:
  傾向使用已存在的 worker threads.
• Thread pools:
  減少 thread creation 的 overhead.

• Fork/join framework:
  An implementation of the ExecutorService interface.
  利於使用在 multiple processors 的環境.

• interface ConcurrentHashMap<K, V>
  extends AbstractMap<K, V>
  implements ConcurrentMap<K, V>, Serializable
• interface ConcurrentMap<K, V>
  extends Map<K, V>