Answered: Modify the following code by adding…

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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Question

Modify the following code by adding (test and set synchronisation)on it. to run the threads con currently.

#include <stdio.h>
#include <stdlib.h>
#include <pthread.h>

long long sum=0,num=2000000;

void *mySumFun(void *vargp)
{
int step=*(int *) vargp;

for(int i=0;i<num;i++)
{
sum+=step;
}
return NULL;
}
int main()
{
pthread_t tid1,tid2;
int step1=1, step2=-1;
pthread_create(&tid1, NULL, mySumFun, &step1);

pthread_create(&tid2, NULL, mySumFun, &step2);
pthread_join(tid2, NULL);
pthread_join(tid1, NULL);
printf("The sum is = %lld \n", sum);
exit(0);
}

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