>For communication and synchronization
–Shared memory
–OS provided IPC
>Message system
–no need for shared variable
– two operations
•send(message) – message size fixed or variable
•receive(message)
>If P and Q wish to communicate, they need to
–establish a communication link between them
–exchange messages via send/receive
>Implementation of communication link
–physical (e.g., shared memory, hardware bus)
–logical (e.g., logical properties)
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