Message passing

Blocking primitives (sync)

  • sender blocked until message recv
  • recver blocked until message arrived

Non-blocking primitives (async)

  • sender resume op after sending, donneed wait for recv
  • recv receives msg if avail / indicates msg not ready, continue
  • not truly async, sent messages are buffered. When buffer is full we have to wait for buffer to flush before we can send again.

implementation with

https://www.geeksforgeeks.org/ipc-using-message-queues/

mq_send, mq_receive

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