Seeking promotion : linux processes and threads under exercises

What is a good under linux process and thread a small program to practice your hand ?
seeking promotion. . . Thank you !
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Linux programming ; small example above is a good
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http://wenku.baidu. com/view/738c47fe910ef12d2af9e70a.html
Reference

can buy a Linux program design , the above examples can also try
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first of all they must first understand the main ideas of threads and processes , as well as his way of handling the problem , so do the problems in the good time to consider how to design . Exercises are everywhere, you can from life considerations, such as : Do you homework when they want to watch TV , how should I do so . To practice hand , we must be ready and the process of thinking into everyday life, after all, the program loses to solve the problem , as long as the problems encountered in life , you can try using programmed to consider the next , hey , sounds a bit extreme , if crude unjustifiable thick.
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upstairs Beginning Linux Programming and APUE are relevant examples
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recommend watching apue
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there any good recommendation ah ? ?
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I want to become familiar through such exercises a function of processes and threads , is there any good small program to practice your hand ? For example : To learn network programming , and went to write a simple chat program , so that progress was fast !