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| n | For the
sender: it is more natural not to be |
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| blocked after
issuing send(.,.) |
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| u | can send several
messages to multiple dest. |
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| u | but sender
usually expect acknowledgment of |
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| message receipt
(in case receiver fails) |
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| n | For the
receiver: it is more natural to be |
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| blocked after
issuing receive(.,.) |
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| u | the receiver
usually needs the info before |
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| proceeding |
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| u | but could be
blocked indefinitely if sender |
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| process fails
before send(.,.) |
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