+ int err;
+ pthread_t tid1, tid2;
+ void *tret;
+
+ printf("thread main, thread id : %lu, pid %lu\n", pthread_self(), getpid());
+ err = pthread_create(&tid1, NULL, thr1, NULL);
+ if(err!=0) exit(1);
+
+ err = pthread_create(&tid2, NULL, thr2, NULL);
+ if(err!=0) exit(1);