When two or more processes continuously change their state in response to changes in the other process(es) without doing any useful work.

This is similar to deadlock in that no progress is made but differs in that neither process is blocked or waiting for anything.

A human example of livelock would be two people who meet face-to-face in a corridor and each moves aside to let the other pass, but they end up swaying from side to side without making any progress because they always move the same way at the same time.

(this is from The Free On-line Dictionary of Computing)

Previous definition taken from Jargon file is AFAIK describing the term starvation rather than livelock ... but I'm not the expert ...
Live Free Or Die! = L = liveware

livelock /li:v'lok/ n.

A situation in which some critical stage of a task is unable to finish because its clients perpetually create more work for it to do after they have been serviced but before it can clear its queue. Differs from deadlock in that the process is not blocked or waiting for anything, but has a virtually infinite amount of work to do and can never catch up.

--The Jargon File version 4.3.1, ed. ESR, autonoded by rescdsk.

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