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Lab 10 Message Queue and Shared Memory

Lab 10 Message Queue and Shared Memory. Message Queue. Message Queue. provide a reasonably easy and efficient way of passing data between two unrelated processes. Message queue 1. message. Process 1. process2. 0. 0. 0. r. w. x. r. w. x. r. w. x. owner permission.

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shmget() : Argument Values

shmget() : Argument Values. key same as before; we use getuid() to make it unique size number of bytes to allocate shmflag Creating: IPC_CREAT and permissions 0 for accessing only. Notes on shmat() arguments. shmid is as before

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Lab 10 Message Queue and Shared Memory

shmget() : Argument Values