package main

import $($

$"$fmt$"$

"strings"

$"$sync$"$

"time"

$)$

type Philosopher struct $\{$

Name string

ChopstickL $*$sync$.$Mutex

ChopstickR $*$sync$.$Mutex

$\}$

type DiningPhilosophers struct $\{$

state $[5]$int

self $[5]*$sync$.$Cond

mutex sync$.$Mutex

$\}$

func $($td $*$DiningPhilosophers$)$ pickup$($i int$)\{$

td$.$mutex.Lock$()//$Aquire the mutex lock

defer td$.$mutex.Unlock$()//$Ensure lock is releasing

td$.$state$[$i$]=$ HUNGRY $//$Input state is hungry

td$.$test$($i$)//$Check and see if the philopsher is eating

if td$.$state$[$i$]!=$ EATING $\{$

td$.$self$[$i$].$Wait$()//$iF NOT EATING THEN WAIT

$\}$

$\}$

func $($td $*$DiningPhilosophers$)$ putdown$($i int$)\{$

td$.$mutex.Lock$()//$Aquire the mutex lock

defer td$.$mutex.Unlock$()//$Ensure lock is releasing

td$.$state$[$i$]=$ THINKING

td$.$test$(($i $+4)\%5)$

td$.$test$(($i $+1)\%5)$

$\}$

func $($td $*$DiningPhilosophers$)$ test$($i int$)\{$

if $($td$.$state$[($i$+4)\%5]!=$ EATING$)$ && $($td$.$state$[$i$]==$ HUNGRY$)$ && $($td$.$state$[($i$+1)\%5]!=$ EATING$)\{$

td$.$state$[$i$]=$ THINKING

td$.$self$[$i$].$Signal$()//$unlocks the mutex

$\}$

$\}$

func $($td $*$DiningPhilosophers$)$ initialization$()\{$

td$.$mutex.Lock$()//$Aquire the mutex lock

defer td$.$mutex.Unlock$()//$Ensure lock is releasing

for i :$=0$; i $<5$; i$++\{$

td$.$self$[$i$]=$ sync$.$NewCond$($&sync$.$Mutex$\{\})//$Each philosopher has its own condition variable and mutex to coordinate their actions.

$\}$

$\}$

func main$()\{$

dine :$=$ DiningPhilosophers$\{\}$

dine.initialization$()//$sets all original values to THINKING

var philosophers $[5]*$Philosopher

for i :$=0$; i $<5$; i$++\{$

fmt$.$Printf$("$Enter philosopher $\%$v name: $",$ i$+1)$

var name string

fmt$.$Scanln$($&name$)$

$//$ Check if the input is an empty string

if strings.TrimSpace$($name$)==""\{$

break $//$if no input is entered then break

$\}$

philosophers$[$i$]=$ &Philosopher$\{$

Name: name,

ChopstickL: &sync$.$Mutex$\{\},$

ChopstickR: &sync$.$Mutex$\{\},$

$\}$

$\}$

fmt$.$Println$("$Table is Empty"$)$

for i$,$ philosopher :$=$ range philosophers $\{$

go func$($idx int, p $*$Philosopher$)\{$

for $\{$

dine.pickup$($idx$)$

fmt$.$Printf$("\%$s Seated

$",$ p$.$Name$)$

fmt$.$Printf$("\%$s Eating

$",$ p$.$Name$)$

time.Sleep$($time$.$Second$)//$ Simulate eating time

fmt$.$Printf$("\%$s Satisfied

$",$ p$.$Name$)$

dine.putdown$($idx$)$

$\}$

$\}($i$,$ philosopher$)$

$\}$

select $\{\}//$select allows for communication to wait on mutliple channels for data$/$signals

$\}$

const $($

THINKING $=$ iota

HUNGRY $//$iota is $1$

EATING $//$iota is $2$

$)$ Fix the folowing dining philospher code for GO there is an issue with the Unlock and Locking sequence for The putdowna nd putin sections