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Embedded Computing Systems Notes
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Write a program that implements solution to Producer – Consumer problem using mutex and...
#include <stdio.h>
#include <semaphore.h>
#include <pthread.h>
#include <stdlib.h>
#include <time.h>
pthread_mutex_t mutex;
sem_t empty, full;
int in=0, out=0, buffer[5];
void *producer(void *pno){
for(int i=0;i<5;i++){
sem_wait(&empty);
pthread_mutex_lock(&mutex);
int x = rand()%100;
buffer[in]=x;
in = (in+1)%5;
printf("Producer %d has put %d in buffern",*((int*)pno), x);
pthread_mutex_unlock(&mutex);
sem_post(&full);
}
}
void *consumer(void* cno){
for(int i=0;i<5;i++){
sem_wait(&full);
pthread_mutex_lock(&mutex);
int x = buffer[out];
out =...
program to perform the following tasks using system calls:
i) Parent process should create a child process
ii) Both parent child processes should display their pid and parent’s pid; parent process should also its child’s pid
iii) Load a new program into child...
Shell program to find the largest of three Numbers
#!/bin/bash
echo "Enter three numbers (space seperated): "
read a b c
echo -n "Largest Number: "
if [ $a -ge $b -a $b -ge $c ]
then
echo "$a"
elif [ $b -ge $a -a $a -ge $c ]
then
echo "$b"
else
echo...
Program that implements solution to Readers-Writers problem using mutex and semaphores.
#include <stdio.h>
#include <semaphore.h>
#include <pthread.h>
pthread_mutex_t mutex;
sem_t wrt;
int cnt=1, numreader=0;
void *writer(void *wno){
sem_wait(&wrt);
cnt = cnt*2;
printf("Writer %d modified cnt to %dn", *((int*)wno), cnt);
sem_post(&wrt);
}
void *reader(void* rno){
pthread_mutex_lock(&mutex);
numreader++;
if (numreader==1)
sem_wait(&wrt);
pthread_mutex_unlock(&mutex);
printf("Reader %d read cnt as %dn", *((int*)rno), cnt);
pthread_mutex_lock(&mutex);
numreader--;
if (numreader==0)
sem_post(&wrt);
pthread_mutex_unlock(&mutex);
}
void main(){
pthread_t write[10], read[10];
pthread_mutex_init(&mutex, NULL);
sem_init(&wrt,0,1);
int...
