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int makethread(void *(*fn),void *arg)
{
       int err;
       pthread_t    tid;
       pthread_attr_t attr;
       err = pthread_attr_init(&attr);
       if(err != 0)
           return (err);
      err = pthread_attr_setdetachstate(&attr,PTHREAD_CREATE_DEATCHED);
     if(err == 0)
        err = pthread_create(&tid,&attr,fn,arg);
     pthread_attr_destroy(&attr);
    return (err);
}