资料来源 : pyDict
心跳
资料来源 : WordNet®
heartbeat
n 1: the rhythmic contraction and expansion of the arteries with
each beat of the heart; "he could feel the beat of her
heart" [syn: {pulse}, {pulsation}, {beat}]
2: a very short time (as the time it takes the eye blink or the
heart to beat); "if I had the chance I'd do it in a flash"
[syn: {blink of an eye}, {flash}, {instant}, {jiffy}, {split
second}, {trice}, {twinkling}, {wink}, {New York minute}]
3: an animating or vital unifying force; "New York is the
commercial heartbeat of America"
资料来源 : Free On-Line Dictionary of Computing
heartbeat
1. The signal emitted by a Level 2 Ethernet
transceiver at the end of every {packet} to show that the
collision-detection circuit is still connected.
2. A periodic synchronisation signal used by software or
hardware, such as a {bus} clock or a periodic {interrupt}.
3. The "natural" oscillation frequency of a computer's clock
crystal, before frequency division down to the machine's clock
rate.
4. A signal emitted at regular intervals by software to
demonstrate that it is still alive. Sometimes hardware is
designed to reboot the machine if it stops hearing a
heartbeat. See also {breath-of-life packet}, {watchdog}.
[{Jargon File}]
(1996-03-12)