Explain concept of buffering, Operating System

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Buffering

Messages exchanged by communication processes reside in a impermanent queue. Such a queue can be executed in three ways.

Zero capacity: The queue length is 0. In this case, the sender must block unless the recipient receives the message.
Bounded capacity: The queue has finite length n, at most n message can reside in it.

If the link is full, the sender must block unless space is available in the queue.

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