Monitors, synchronization

• monitor

  • lock that grants access to one process / thread at a time
    • mutual exclusion
  • other processes / threads must wait in a queue
  • various "granularities"
    • class, methods, code blocks
    • static, instance
  • once thread has entered lock, it can go through it again
    • reentrant
  • can create deadlock: dining philosophers problem
  • methods
    • wait()
    • notifyAll()

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