Deadlock: N. 1. [techspeak] A Situation Wherein Two Or More Processes Are Unable To Proceed Because Each Is Waiting For One Of The Others To Do Something.

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:deadlock: n. 1. [techspeak] A situation wherein two or more
processes are unable to proceed because each is waiting for one of
the others to do something. A common example is a program
communicating to a server, which may find itself waiting for output
from the server before sending anything more to it, while the
server is similarly waiting for more input from the controlling
program before outputting anything. (It is reported that this
particular flavor of deadlock is sometimes called a `starvation
deadlock', though the term `starvation' is more properly used for
situations where a program can never run simply because it never
gets high enough priority. Another common flavor is
`constipation', in which each process is trying to send stuff to
the other but all buffers are full because nobody is reading
anything.) See {deadly embrace}. 2. Also used of deadlock-like
interactions between humans, as when two people meet in a narrow
corridor, and each tries to be polite by moving 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.
-- The AI Hackers Dictionary