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CS170 Discussion – 2009-05-01

This project involves implementing a semaphore server in Minix, adding it to the boot process, and extending the posix library with new functions. It also requires solving a synchronization problem involving students asking questions to a professor.

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CS170 Discussion – 2009-05-01

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  1. CS170 Discussion – 2009-05-01 Bryce Boe

  2. Outline • Project 4 Overview • Midterm Information • Midterm questions / project 3 questions

  3. Project 4 • 1) Implement a semaphore server in minix • Add server to the boot process • Add functions to posix library • Add message passing permissions • Service needs to automatically restart if killed • 2) Solve a synchronization problem

  4. Semaphore Service API • intsema_init(intsemaphore_number, intstart_value) • intsema_down(intsemaphore_number) • intsema_up(intsemaphore_number) • intsema_release(intsemaphore_number) • Valid semaphore_numbers: 0-9

  5. Hint, hint • Sending a message in minix is blocks until the reply is received • http://www.usenix.org/publications/login/2006-04/openpdfs/herder.pdf -- read it

  6. Synchronization Problem • Many students want to ask a single professor a question • Synchronize the questions so the professor doesn’t go crazy, and the students have their questions answered

  7. Midterm • 5 Questions, each with multiple parts • Covers material up to and including slide 24 of the deadlocks set (cs-170-06.pdf) • Review _all_ slides and projects

  8. Questions, comments or answers?

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