SysV IPC Facilities

• Semaphores: objects used to synchronize access to shared resources. Think of them as “locks.”

• Message queues: a header pointing to a linked list of messages. Each message contains a 32-bit “type” value, followed by the “data” area.

• Shared memory: a region of physical memory that is shared by multiple processes.

  • Singly the fastest method of IPC

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