ase write the code in
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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Transcribed Image Text:Use hardware mechanism test and set or swap to solve synchronization for lab 4 exercise
Lab 4 exercise :
#include <stdio.h>
#include <stdlib.h>
#include <pthread.h>
long long sum=0, num32000000;
pthread_mutex_t mutex = PTHREAD_MUTEX_INITIALIZER;
void *mySumFun (void *vargp)
int step=* (int *) vargp;
for (int i-0;i<num;i++)
//pthread_mutex_lock (&mutex);
sum+=step;
// pthread_mutex_unlock (&mutex);
return NULL;
int main ()
pthread_t tidl,tid2;
int stepl=1, step2=-l;
pthread_create (&tidl, NULL, mySumFun, &stepl);
pthread_create (&tid2, NULL, mySumFun, &step2);
pthread_join (tid2, NULL);
pthread_join (tidl, NULL);
printf ("The sum is $1ld \n", sum);
exit (0);
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