Advanced UNIX programming

1
Advanced UNIX programming

• Fall 2002
• Instructor Ashok Srinivasan
• Lecture 22

Acknowledgements The syllabus and power point
presentations are modified versions of those by
T. Baker and X. Yuan
2
Announcements

• Reading assignment
• Chapter 27
• Sections 27.1 and 27.2
• Section 27.6
• Chapter 7
• Sections 7.1 7.6 and 7.9 7.11
• Project will be announced today
• Quiz Monday

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Week 8 Topics

• Client-Server design
• Concurrent server
• Programming assignment 3 discussion
• Client-server design alternatives
• Server with multiplexed I/O
• Preforked server

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Client-server design alternatives

• Server with multiplexed I/O
• Preforked server

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Preforked server

• Main limitation of concurrent server
• fork overhead
• Instead, prefork N processes and use them forever
• See example1.c and example2.c