INTER PROCESS COMMUNICATION

INTER PROCESS COMMUNICATION-Interprocess Communication (IPC)Mechanism for processes to communicate and to synchronize their actions
:Message system– processes communicate with each other without resorting to shared variables.
:IPC facility provides 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) considered later
>> logical (e.g., logical properties) now