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Definition of "First In First Out" |
In computer programming, FIFO (first-in first-out) is an approach to handling program work requests from queues or stacks so that the oldest request is handled next. LIFO (last-in, first-out) is an approach in which the most recent request is handled next and the oldest request doesn't get handled until it is the only remaining request on the queue (or in the stack). Although LIFO seems "unfair," it may be more efficient. A stack that is handled using LIFO is sometimes referred to as a push-down or push-down pop-up stack or list. |
Definition of "First-In First-Out" |
[FIFO] A queuing discipline in which entities in a queue leave the queue in the same order in which they arrive. A 74ALS236 TTL logic gate. An integrated circuit used to buffer or interface an incoming data stream arriving at one rate from one circuit to another circuit retrieving data at a different rate [using status flags to indicate when the FIFO becomes full or empty]. |
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