我目前正在为网络方面的考试做准备,我有一些问题:
Are both UDP and IP unreliable to the same degree? Why or Why not?
What is DC component and baseline wandering in digital transmission?
实际上我的物理不是很好,所以如果有人能用“简单英语”给我第二个问题的答案,那就太好了。
假设我有10个过程,如:
process p0 with PID 1.
process p1 with PID 2.
process p2 with PID 3.
process p3 with PID 4.
process p4 with PID 5.
process p5 with PID 6.
process p6 with PID 7.
process p7 with PID 8.
process p8 with PID 9.
process p9 with PID 10.
当我终止一个进程时,例如:
kill 7
进程p6被成功杀死,进程p5和p7之间为空,当我将p10作为进程运行时
我使用的是serial port,在与此通信时,我必须使用tcsetattr()和TCSDRAIN模式更改配置。
TCSADRAIN
The change should take place after all output written to fd has been read by the master pseudoterminal. Use this value when changing terminal attributes that affect output.
当使用tcsetattr()调用TCSDRAIN时,如果缓冲区中仍然保留输出数据,则Linux似乎被阻塞,并在中
在启动其他线程(包括reactor.run() web服务器)之后,我在主线程中启动了带有reactor.run()的反应堆,从而运行了一个Twisted应用程序。下面是一个程序,当Ctrl+C在Linux上按下而不是在Windows上按下时,它会干净地关闭:
from threading import Thread
from signal import signal, SIGINT
import cherrypy
from twisted.internet import reactor
from twisted.web.client import getPage
def stop(si