- For Communication and Synchronization
-Share memory
-OS provide IPC
- Message system
-No need for shared available
-Two operations:
1.send (message)-message fixed or variable
2.recieve message
- if P and Q wish to communicate, they need to:
-establish a communication link betweeen them
-exchange message via send/ recieve
- Implemention of communication Link
-physical(e.g. , shared memory, hardware bus)
-logical(e.g. , logical properties)
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