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#include <stdio.h>
#include <stdlib.h>
#include <semaphore.h>
#include <pthread.h>
#include <wait.h>
#include <unistd.h>

sem_t pingsemafor,pongsemfor;

void *ping(void *arg){
    while(1){

        sem_wait(&pingsemafor);
        printf("\n Ping");
        sleep(1);

        sem_post(&pongsemfor);
    }

}

void *pong(void *arg){
    while(1){

        sem_wait(&pongsemfor);
        printf("\n Pong");
        sleep(1);

        sem_post(&pingsemafor);
    }

}




int main()
{
    sem_init(&pingsemafor,0,1);
    sem_init(&pongsemfor,0,0);

    pthread_t ping_thread,pong_thread;


    pthread_create(&ping_thread,NULL,ping,NULL);
     pthread_create(&pong_thread,NULL,ping,NULL);

     pthread_join(&ping_thread,NULL);
     pthread_join(&pong_thread,NULL);




    return 0;
}