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Representation of a FIFO queue. In computing and in systems theory, first in, first out (the first in is the first out), acronymized as FIFO, is a method for organizing the manipulation of a data structure (often, specifically a data buffer) where the oldest (first) entry, or "head" of the queue, is processed first.
FIFO in stock rotation, particularly to avoid food spoilage; FIFO (computing and electronics), a method of queuing or memory management Queue (abstract data type), data abstraction of the queuing concept; FIFO and LIFO accounting, methods used in managing inventory and financial matters
"FIFO" stands for first-in, first-out, meaning that the oldest inventory items are recorded as sold first (but this does not necessarily mean that the exact oldest physical object has been tracked and sold). In other words, the cost associated with the inventory that was purchased first is the cost expensed first.
In computing, a named pipe (also known as a FIFO for its behavior) is an extension to the traditional pipe concept on Unix and Unix-like systems, and is one of the methods of inter-process communication (IPC). The concept is also found in OS/2 and Microsoft Windows, although the semantics differ substantially.
The operations of a queue make it a first-in-first-out (FIFO) data structure. In a FIFO data structure, the first element added to the queue will be the first one to be removed. This is equivalent to the requirement that once a new element is added, all elements that were added before have to be removed before the new element can be removed.
FIFO simply queues processes in the order that they arrive in the ready queue. This is commonly used for a task queue , for example as illustrated in this section. Since context switches only occur upon process termination, and no reorganization of the process queue is required, scheduling overhead is minimal.
It is often abbreviated to FIFO when referring to employment status. This is common in large mining regions in Australia [ 1 ] [ 2 ] and Canada. Similar to the fly-in fly-out roster are the DIDO (drive-in drive-out), BIBO (bus-in bus-out) and SISO (ship-in ship-out) rosters .
First-In First-Out (FIFO) assumes that the items purchased or produced first are sold first. Costs of inventory per unit or item are determined at the time produces or purchased. The oldest cost (i.e., the first in) is then matched against revenue and assigned to cost of goods sold. Last-In First-Out (LIFO) is the reverse of FIFO.