Using available physical CPU core in pthread in Linux
thread1 in proccessor 0
thread2 in proccessor 1
.
.
.
threadn in processor n

if(for thread 1 )
        {
        pthread_attr_init(&pta);
        CPU_SET(0,&cpuset);
        pthread_setaffinity_np(thread1, sizeof(cpu_set_t), &cpuset);
        pthread_create(&thread1,&pta,&sendimsg,(void*)&message);
        pthread_join(thread1,NULL);
        printf("User for Thread One : %dn",numb.fir);
        pthread_attr_destroy(&pta);
        CPU_ZERO(&cpuset);
        }

            else if(for thread 2)
            {
            pthread_attr_init(&pra);
            CPU_SET(1,&cpuset1);
            pthread_setaffinity_np(thread2, sizeof(cpu_set_t), &cpuset);
            pthread_create(&thread2,&pra,&sendimsg,(void*)&message);
            pthread_join(thread2,NULL);
            printf("User for Thread Two : %dn",numb.sec);
            pthread_attr_destroy(&pra);
            CPU_ZERO(&cpuset1);
            }

            for eight thread that way.