线程解析（二）

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                printf("create tid_b = %u\n",tid_b);

        err = pthread_create(&tid_c,NULL,thread_c,(void *)&tid_c);
                if(err < 0)
                {
                        perror("pthread_create thread_c");
                }
                printf("create tid_c = %u\n",tid_c);

                sleep(5);
                if(pthread_cancel(tid_a) != 0)
                {
                        perror("pthread_cancel tid_a");
                }

                sleep(5);
                if(pthread_cancel(tid_b) != 0)
                {
                        perror("pthread_cancel tid_b");
                }

        sleep(5);
                if(pthread_cancel(tid_c) != 0)
                {
                        perror("pthread_cancel tid_c");
                }
                sleep(30);
                printf("the main close\n");
                return 0;
        }

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