If a communication paradigm is asynchronous, is it also time-uncoupled? Explain your answer with examples as appropriate.
What will be an ideal response?
Asynchronous communication is where a sender sends a message and then continues and does not have to block until the message is delivered to the receiver, that is the sender and receiver do not have to meet in time to exchange a message. Time uncoupling goes further by stating that senders and receives can have independent existences (see also the discussion in Exercises 6.3 and 6.4).
Many message passing systems are asynchronous but directed towards a recipient that is assumed to exist as a given point in time (for example, the non-blocking variants of MPI as discussed in Section 4.6). In other words, an asynchronous system could decline the send if the recipient doesn't exist at that point in time, and hence is not time-uncoupled.
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