Synchronization With Messages

• Send:
  • Blocking send
    • Sender process is blocked till receiver process receives the message
  • Non-blocking send
    • Sender process resumes after send.
• Receive
  • Blocking receive
    • Receiver process waits until a message is received
  • Non-blocking receive
    • Receiver process does not wait if the message is not ready.
      Return status indicates if message is ready or not.

Buffering Model

• Buffer capacity:
  • Zero capacity.
    • Link can not have any waiting message.
    • Sender must block till receiver is ready to receive
  • Bounded capacity.
• Finite storage of waiting messages.
• Sender blocks when link is full.
• Unbounded capacity.
• Sender never blocks.