Programming

 
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#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/types.h>
#include <pthread.h>
#include <sys/sem.h>
#include <semaphore.h>
sem_t mysem;
void *thread(void *);
int main()
{
        sem_init(&mysem,0,1);
        pthread_t tid[2];
 
        pthread_attr_t attr[2];
        pthread_attr_init(&attr[0]);
        pthread_attr_init(&attr[1]);
        {
        pthread_create(&tid[0],&attr[0],thread,(void *)0);
        pthread_create(&tid[1],&attr[1],thread,(void *)1);
        }
        {
        pthread_join(tid[0],NULL);
        pthread_join(tid[1],NULL);
        }
        printf("\nThreads finished!\n");
        return 0;
}
void *thread(void *n)
{
        int i;
        i = (int)n;
        int x = 0;
        while(x < 3)
        {
        sem_wait(&mysem);
        printf("%d\n\n",i);
        sem_post(&mysem);
        x++;
        }
        pthread_exit(0);
}

void *thread(void *n)
{
        int i;
        i = (int)n;
        int x = 0;
        while(x < 3)
        {
        sem_wait(&mysem);
        printf("%d\n\n",i);
        sem_post(&mysem);
        x++;
        sleep(1);
        }
        pthread_exit(0);
}

sem_t zero, one;