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update ipc
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wolverinn committed Feb 27, 2020
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6 changes: 3 additions & 3 deletions Operating Systems.md
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4. 信号(Signal)
5. 共享内存
6. 信号量(Semaphore):初始化操作、P操作、V操作;P操作:信号量-1,检测是否小于0,小于则进程进入阻塞状态;V操作:信号量+1,若小于等于0,则从队列中唤醒一个等待的进程进入就绪态

![https://blog.csdn.net/sweetyoyy/article/details/77926871](_v_images/20191202162008435_14938.png)

7. 套接字(Socket)

更详细的可以参考(待整理):
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- [ ] 进程同步问题:生产者-消费者问题...
- [ ] 银行家算法
- [ ] 文件与文件系统、文件管理?
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<img src="_v_images/20191202162008435_14938.png" width=540px></img>
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