Answer Posted / ashwini

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

pthread_mutex_t m;

void* writer(void*);
void* reader(void*);

FILE *fp;



main()
{
pthread_t tid1,tid2,tid3;
pthread_mutex_init(&m,NULL);
pthread_create(&tid2,NULL,reader,NULL);
pthread_create(&tid1,NULL,writer,NULL);
pthread_create(&tid3,NULL,reader,NULL);

pthread_join(tid2,NULL);
pthread_join(tid1,NULL);
pthread_join(tid3,NULL);
}
void* writer(void *str)
{
pthread_mutex_lock(&m);

fp=fopen("file1.txt","w");
global += 35;
fprintf(fp,"%d",100);
fclose(fp);
pthread_mutex_unlock(&m);
}
void* reader(void *param)
{
int abc;
pthread_mutex_lock(&m);
fp=fopen("file1.txt","r");
fscanf(fp,"%d",&abc);
printf("%d",global);
fclose(fp);
pthread_mutex_unlock(&m);
}

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