Introduction

35 points total.

• At most, 15 points if what you project does not run.
• Minus 35 points for being one minute late - there is no late.
• Up to minus 5 points if your description does not describe your use of semaphores or shared memory (acquiring, attaching, releasing, etc.). We made no requirements on the number of semaphores nor how they were used. Obviously, at least 1 semaphore is need as a mutual exclusion control. After that, there are a number of choices, describe yours.
• Up to minus 5 points if you solution does not describe and use a circular buffer. It is true that once things start running, you do not maintain a circular buffer; but if only one type of customer arrives, the Barber Shop should be a circular buffer.
• Up to minus 5 points if your description does not describe the overall operation of your program, i.e., who forks whom, how program termination occurs, etc.
• 5 Points max for correct performance on each of the following input files (note, run against your original code that was your designated Basic Barber Shop Project.) Attach printouts or screen dumps as appropriate. Also, highlight and annotate the printouts as indicated for each input file . You don't highlight and annotate, you get 0. Please save some paper by using something like lp4.

Input Files:

1. input1.txt -
   • consumer sleep = -1
   • print shop contents
   • producer sleep = -3
   • highlight and annotate: start of the program, final counts
   • Demonstrates: tests the robustness of your argument checking.
   This is the original input with lousy start parameters. Recovery is actually your choice, but you must recognize the bad parameters.
   2 grunts, 3 noncoms, 3 officers

   

2. input2.txt -
   • consumer sleep = 1
   • print shop contents
   • producer sleep = 2
   
   
   • Demonstrates: priority; should see a total of 5 officers, 5 noncoms, 6 grunts.
     
     • 3 officers should get hair cut 1st
     • then some number of noncoms,
     • then a new officer (#4)
     • then noncoms and maybe a grunt
     • then another officer (last input)
     • then finish noncoms & grunts.
   • highlight and annotate:
     Each officer entering Barber Shop and getting hair cut, and processes dying.

   

3. input3.txt -
   • consumer sleep = 66
   • print shop contents
   • producer sleep = 3
   • highlight and annotate:
     Each officer entrance into Barber Shop and hair cut, NonCom entrance into Barber Shop, NonCom hair cut.
   • Demonstrates: ability to handle full queue and to handle new entries having a higher priority then those currently waiting.
   
   should see queue fill up, 18 nc, 1 g, 3 officer. officers should get hair cut 1st, then nc, then grunts.

   

4. input4.txt -
   • consumer sleep = 45
   • print shop contents
   • producer sleep = 3
   • Demonstrates: priority movement.
   • highlight and annotate:
     officers entering Barber Shop and getting hair cut; and processes dying.
   
   see a mixed Barber Shop of officers, noncoms, and grunts. officers should come in and move ahead for haircuts.

What are you to do?

1. Each individual is to resubmit Basic Barber Shop Project with the following stapled together (for those who do not have a stapler, buy one or borrow one - unstapled projects will be immediately rejected)):
   • Basic Barber Shop Student Grade sheet as cover (this page) with you Name on it.
   • Your complete highlighted and annotated listings (use lp4 or some other way to save paper) for runs of the inputs described above.
2. Due Saturday, 9pm, 28 April.