SingletonImmutableSet

MODBUS是工业领域通信协议的业界标准。这是周立功MODBUS的源码，适合应用和学习，需要的朋友可以看看。(MODBUS communication protocol is the industry standard in the industry. This is Zhou Ligong MODBUS source code, suitable for application and study, need friends can look at.)

基于C#网络通信编程，SOCKET客户端与服务端通信协议的程序连接测试，IPADDRESS类使用。-Network communication based on C# programming, SOCKET client and server communication protocols to connect test, IPADDRESS class to use.

DOS下串口通信程序来传送文件的C源代码，能实现文件传送-DOS serial communication procedures to document transmission C source code can achieve file transfer

该代码主要实现了FTN的编程，包括图形的呈现，FTN基于根升余弦波形的行程(This code mainly implements FTN programming)

模拟交通信号灯控制，一般情况下正常显示，有急救车到达时，两个方向交通 信号灯全红，以便让急救车通过。设急救车通过路口时间为10 秒，急救车通过后，交通恢 复正常，用单次脉冲申请外部中断，表示有急救车通过。(simulated traffic signal control, under normal circumstances normal show that emergency vehicles arrived, the two directions of traffic lights all red, in order to allow emergency vehicles through. Based emergency vehicles through the intersection for 10 seconds, after the passage of emergency vehicles, traffic returned to normal, with a single pulse for external interrupts, saying that a first aid trucks.)

TODO(jar): This is not needed when TCMalloc_PageMap1_LazyCommit has an API supporting commit and reservation of memory.

说明：  利用FlashPaper将Word、Excel、PPT等转换成swf，实现在线预览(Using FlashPaper to convert Word, Excel, PPT and so on into swf to realize online preview)

javascript写的打飞机游戏,有背景音乐，下载解压后打开html文件即可(airplane battle game)

UNIX网络编程影印版 UNIX网络编程的经典之作。附录中给出了测量各种IPC形式性能的方法。 本书内容详尽且具权威性，几乎每章都提供精选的习题，并提供了部分习题的答案，是网络研究和开发人员理想的参考书。(Network programming in UNIX Second Edition UNIX network programming classic. The appendix gives measurements of various IPC form of the performance of the method. The contents of this book is a detailed and authoritative, almost every chapter with a selection of exercises, and provides part of the answer, is a network of research and development personnel to the ideal reference book.)

(1).本程序是用powerbuilder语言编写的，运行环境是powerbuilder9.0。 (2).本程序能实现基本的四则运算，平方运算，阶乘运算，开方运算，自然对数运算， 求正弦、余弦，N与∏的乘积运，本程序能显示17位整数，超过17位则自动转换成 科学计数法形式，并保留15位小数。 (3).出现计算器页面后点击on/off后方可运行。 (4).本程序提供键盘和按钮输入两种方法。((1) This procedure is used powerbuilder language, the operating environment is powerbuilder9.0. (2) This procedure can achieve the four basic arithmetic, squaring, factorial computation, root operation, the natural logarithm operation, sine, cosine, N and Π product shipped, the program can display 17 integer, more than 17 bit is automatically converted to scientific notation form, and retain 15 decimal places. (3) The emergence of the calculator page and click on/before after running off. (4) This program provides two ways to enter the keyboard and buttons.)