Home / cs-notes / Language / Java / Problems / wait & notify

why in locked block

• wait: read a condition in thread A
• notify: write the same condition in thread B
• reading and writing of the same condition must be exclusive
  • ensure thread-safe
    • keep the Happen-Before rule
• notice
  • the waiting thread and the notifying thread must use the same lock

some others like this

• condition: await & signal/signalAll

ref

• https://blog.csdn.net/lengxiao1993/article/details/52296220
• https://juejin.cn/post/6844904088505679879

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why in loop

• https://blog.csdn.net/u013256816/article/details/106654315

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why use notifyAll instead of notify

• ‘notify’ maybe cause deadlock
  • when the waked thread go to wait other then notify
    • all threads will keep waiting

concept

• object
  • moniter pool
  • waiting pool

ref

• https://blog.csdn.net/u013256816/article/details/106654315
• https://blog.csdn.net/meism5/article/details/90238268
• https://www.cnblogs.com/YuyuanNo1/p/11549781.html

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