Programming

 
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/types.h>
#include <pthread.h>
#include <semaphore.h>
#include <sys/sem.h>
 
int pargc;
char **pargv;
sem_t sem;
void *Print(void *);
int main(int argc, char *argv[])
{
        pargv = argv;
        sem_init(&sem,0,1);
        pthread_t tid1;
        pthread_t tid2;
        int t1 = 1;
        int t2 = 2;
        pthread_attr_t attr1;
        pthread_attr_t attr2;
        pthread_attr_init(&attr1);
        pthread_attr_init(&attr2);
        {
        pthread_create(&tid1,&attr1,Print,(void *)2);
        pthread_create(&tid2,&attr2,Print,(void *)3);
        }
        {
        pthread_join(tid1,NULL);
        pthread_join(tid2,NULL);
        }
        printf("\nThreads finished!\n");
        return 0;
}
void *Print(void *n)
{
        int i = 0;
        int x;
        x = (int)n;
        for(i = 0;i<3;i++)
        {
        sem_wait(&sem);
        printf("%d ",x);
        sem_post(&sem);
        }
        return (void *)(1);
}