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First In Never Out (FINO) scheduling in Operating System

  • Last Updated : 04 Aug, 2020

First In Never Out (FINO) scheduling is funny technique for handling data structures whereby the primary component is not processed or we say that none of the component is processed and all are held back permanently.

In applied science, FINO may be humorous programming scheduling algorithm as contradictory to traditional first in, first out (FIFO) and last in, first out (LIFO) algorithms.

This scheduling algorithm works in such way that all the process entered are being held back permanently or being blocked. No matter how many tasks are scheduled or how many tasks are there in the queue at any time, no task ever actually takes place

FINO was first mentioned in the Signetics 25120 write-only memory joke datasheet, which was American electronics manufacturer founded in 1961 specifically established to make integrated circuits, as humorous scheduling algorithm whereby the requests once entered in the queue will never be able to get processed.

Implementation of FINO :

// C++ program to demonstrate working of FINO
// using Queue interface in C++
#include <bits/stdc++.h>
using namespace std;
int main()
    queue<int> q;
    int t
        >> t;
    for (int x = 0; x < t; x++)
    return 0;

Where is FINO used?

  • In operating system, memory leak is type of resource leak that occurs when operating system incorrectly manages memory allocations in such way that memory which is no longer needed is not released. And stateful FINO queue is used to implement such memory leak.
  • In write only memory (WOM) –
    Write-only memory (WOM) is fictional computer memory, just opposite of read-only memory (ROM).Technically, WOM is memory device which can be written but never read.

    In the earlier stages, there were no practical use for memory circuit to which data could only be written and can not be read and concept was several times used as pun or funny joke for failed memory device. Until the first use of Write Only Memory was given by Signetics in 1972. The incorporation Signetics published some write-only memory (WOM) theories and literature because results of indoor antic, which is usually referenced within industry, staple of software engineering lexicons and included in collections of best hoaxes.

  • Bit bucket is also related to First In Never Out buffer and Write Only Memory. In computing science and technology, bit bucket is where all lost computerized data has gone, being lost in transmission, computer crash. All these datas are said to have gone to bit bucket, mysterious place on computer where lost data goes.
  • FINO queue is used in black hole in computer networks also. In computer science and networking, black holes refer to virtual places in computer network where incoming and/or outgoing traffic is silently thrown away or dropped, without informing source that data did not reach its intended recipient and all of this, idea and implementation of black hole is based on FINO.

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