# Dining Philosophers Problem Solution Using Semaphores In C With Code Examples

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Dining Philosophers Problem Solution Using Semaphores In C With Code Examples

We’ll try to make use of programming on this lesson to resolve the Dining Philosophers Problem Solution Using Semaphores In C puzzle. This is demonstrated within the code under.

`#embody<stdio.h>#embody<stdlib.h>#embody<pthread.h>#embody<semaphore.h>#embody<unistd.h>sem_t room;sem_t chopstick[5];void * thinker(void *);void eat(int);int principal(){	int i,a[5];	pthread_t tid[5];		sem_init(&room,0,4);		for(i=0;i<5;i++)		sem_init(&chopstick[i],0,1);			for(i=0;i<5;i++){		a[i]=i;		pthread_create(&tid[i],NULL,thinker,(void *)&a[i]);	}	for(i=0;i<5;i++)		pthread_join(tid[i],NULL);}void * thinker(void * num){	int phil=*(int *)num;	sem_wait(&room);	printf("nPhilosopher %d has entered room",phil);	sem_wait(&chopstick[phil]);	sem_wait(&chopstick[(phil+1)%5]);	eat(phil);	sleep(2);	printf("nPhilosopher %d has completed consuming",phil);	sem_post(&chopstick[(phil+1)%5]);	sem_post(&chopstick[phil]);	sem_post(&room);}void eat(int phil){	printf("nPhilosopher %d is consuming",phil);}/* BY - ANUSHKA DESHPANDE */`

As we’ve seen, the Dining Philosophers Problem Solution Using Semaphores In C drawback was solved through the use of a variety of totally different cases.

## What is Dining Philosophers Problem write an answer utilizing semaphores?

An answer of the Dining Philosophers Problem is to make use of a semaphore to characterize a chopstick. A chopstick may be picked up by executing a wait operation on the semaphore and launched by executing a sign semaphore.24-Jun-2020

two semaphores

## How many philosophers might eat concurrently within the Dining Philosophers drawback with 7 philosophers?

A thinker take chopsticks provided that each chopsticks have been there. If all philosophers starvation concurrently, then solely two philosophers who can eat, as a result of philosophers took two chopsticks on the identical time. Dining Philosophers Problem is likely one of the basic points within the working techniques.

## What is the issue in eating thinker drawback?

The eating thinker’s drawback is the classical drawback of synchronization which says that Five philosophers are sitting round a round desk and their job is to suppose and eat alternatively. A bowl of noodles is positioned on the middle of the desk together with 5 chopsticks for every of the philosophers.

## What is semaphore and its varieties?

Overview : Semaphores are compound knowledge varieties with two fields one is a Non-negative integer S.V and the second is Set of processes in a queue S.L. It is used to resolve crucial part issues, and through the use of two atomic operations, it is going to be solved. In this, wait and sign that’s used for course of synchronization.31-May-2021

## What is semaphore clarify why is it used for?

A semaphore is just an integer variable that’s shared between threads. This variable is used to resolve the crucial part drawback and to realize course of synchronization within the multiprocessing surroundings. This is also called mutex lock. It can have solely two values – 0 and 1.22-Sept-2022

## What is eating thinker drawback and the way can it’s solved utilizing mutex locks?

To handle this drawback, we might think about every chopstick as a shared merchandise protected by a mutex lock. Each thinker, earlier than he can eat, locks his left chopstick and locks his proper chopstick. If the acquisitions of each locks are profitable, this thinker now owns two locks (therefore two chopsticks), and may eat.

two philosophers

## How can we keep away from impasse in eating thinker drawback?

The waiter answer to Dining Philosophers Strategy: Every thinker should request every of their (shared) chopsticks from a waiter, who might refuse the request at first with the intention to keep away from a impasse. For comfort, we assume that each one philosophers request their left chopstick first, then their proper chopstick.