Interprocess Communication

• 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)