Answer Posted / kiran baviskar

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

pthread_mutex_t x,wsem;
pthread_t tid;
int readcount;

void intialize()
{
pthread_mutex_init(&x,NULL);
pthread_mutex_init(&wsem,NULL);
readcount=0;
}

void * reader (void * param)
{
int waittime;
waittime = rand() % 5;
printf("
Reader is trying to enter");
pthread_mutex_lock(&x);
readcount++;
if(readcount==1)
pthread_mutex_lock(&wsem);
printf("
%d Reader is inside ",readcount);
pthread_mutex_unlock(&x);
sleep(waittime);
pthread_mutex_lock(&x);
readcount--;
if(readcount==0)
pthread_mutex_unlock(&wsem);
pthread_mutex_unlock(&x);
printf("
Reader is Leaving");
}

void * writer (void * param)
{
int waittime;
waittime=rand() % 3;
printf("
Writer is trying to enter");
pthread_mutex_lock(&wsem);
printf("
Write has entered");
sleep(waittime);
pthread_mutex_unlock(&wsem);
printf("
Writer is leaving");
sleep(30);
exit(0);
}

int main()
{
int n1,n2,i;
printf("
Enter the no of readers: ");
scanf("%d",&n1);
printf("
Enter the no of writers: ");
scanf("%d",&n2);
for(i=0;i<n1;i++)
pthread_create(&tid,NULL,reader,NULL);
for(i=0;i<n2;i++)
pthread_create(&tid,NULL,writer,NULL);
sleep(30);
exit(0);
}

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