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Topic: Sleeping barber problem

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In the News (Tue 23 Jul 19)

  CPSC 331 Sleeping Barber Solution
Meanwhile, the barber cannot proceed past the "waiting for customers" stage until signalled by the customer, which occurs after the customer has sat in the barber chair.
The barber cannot proceed past the "waiting for customers" stage again until the next customer is seated in the barber's chair.
Each customer signals the barber when they've sat down, and using semaphores means that the order in which the customer signals and the barber waits doesn't matter.
math.hws.edu /~bridgeman/courses/331/f05/handouts/barber.html   (435 words)

 Sleeping barber problem - Wikipedia, the free encyclopedia
In computer science, the sleeping barber problem is a classic inter-process communication and synchronization problem between multiple operating system processes.
This problem involves only one barber, and it is therefore also called the single sleeping barber problem.
A multiple sleeping barbers problem is similar in the nature of implementation and pitfalls, but has the additional complexity of coordinating several barbers among the waiting customers.
en.wikipedia.org /wiki/Sleeping_barber_problem   (523 words)

 [No title]
This problem from the Spring 2001 midterm is similar to the classical "sleeping barber" problem, also known locally as "sleeping professor".
Problem 2: Sellshort This problem was intended to be immediately recognizable to the initiated as a reader/writer lock with writer priority.
Problem 3: Got Milk This is a direct bounded producer/consumer problem similar to BoundedBuffer in Lab 3.
www.cs.duke.edu /~chase/cps110-archive/midterm01s-sol.txt   (1759 words)

 Sleeping Barber Applet - Fall 1997 CS 533   (Site not responding. Last check: 2007-10-12)
When a customer arrives and finds the barber sleeping, the customer awakens the barber, sits in the barber's chair, and sleeps while the barber cuts his hair.
If the barber is busy when a customer arrives, the customer goes to sleep in one of the other chairs.
If there are waiting customers, the barber then awakens one and cuts it's haif, otherwise, the barber falls back to sleep until a new customer arrives.
coyote.csusm.edu /public/margo/sb/SleepingBarber.html   (193 words)

 Laboratory Exercises For Computer Science 213   (Site not responding. Last check: 2007-10-12)
Sleeping Barber Problem: Many books, including our textbook, state variations of the Sleeping Barber Problem, which was first proposed by Edsger W. Dijkstra in 1968.
The barber sleeps (or daydreams) when no customer customer is waiting (and is not in the barber's own chair).
If at least one barber is sleeping, the customer looks at a sign, wakes up the barber who has been sleeping the longest, and sits in that barber's chair (after the barber has stood up).
www.math.grin.edu /~walker/courses/213.fa00/lab-barbershop.html   (575 words)

 91.308 Assignment 7: Threads and the Sleeping Barber Problem
When a customer is available, the barber wakes up and gives him a haircut, and the customer leaves.
The Sleeping Barber problem is a classical IPC (inter process communication) problem that models waiting queues (e.g., a telephone service call center).
The implementation is written in C and uses pthreads to implement the customer and barber processes.
www.cs.uml.edu /~fredm/courses/91.308-fall05/assignment7.shtml?print   (604 words)

 62.306 Systems Programming - Assignemnt 2
The second readers and writers problem requires that threads wishing to read must wait behind threads that are already waiting to write.
The second is that the barber does not actually cut hair himself, but has a minion do it on his behalf.
With this change, the sleeping barber resembles a device driver, the minion resembles the device, and the customers resemble I/O-requesting processes.
flinflon.brandonu.ca /dueck/2000/62306/A2.htm   (651 words)

 Instructor Handout IV (Lab 4)
A barbershop consists of a waiting room with n chairs, and a barber room with one barber chair.
If the barber is busy, but chairs are available, then the customer sits in one of the free chairs.
If the barber is asleep, the arrival of a customer wakes up the barber.
gram.eng.uci.edu /~carden/ece142f03/notes/a4.html   (289 words)

 The Sleeping Barber Problem
There are three doors: from the street to the waiting room, from the waiting room to the chair, and from the barber chair to the street.
The doors are assumed to be narrow and allow at most one person to pass at a time.
If there is a customer, escort him to the chair; otherwise go to sleep in the barber chair.
cs.millersville.edu /~webster/cs380/assignment4.html   (192 words)

 Semaphore (programming) Summary
In the 1960s, the problem of mutual exclusion in computing environments, where processors had to be restricted in their access to shared resources, arose.
Many semaphore implementations also have "thundering herd" problems and lose atomicity if there is a significant amount of contention between processes; the implementation can get overwhelmed with P requests and behave in incorrect ways, thus destroying the functionality expected of the semaphore design.
Semaphores are the classic solution to the dining philosophers problem, although they do not prevent all deadlocks.
www.bookrags.com /Semaphore_(programming)   (2001 words)

 [No title]
Sleeping Barber Problem: The shop has a barber, a barber chair, and a waiting room with several chairs.
When a barber finishes cutting a customer's hair, the barber fetches another customer from the waiting room if there is a customer, or stands by the barber chair and daydreams if the waiting room is empty.
If the barber is busy but there is a waiting room chair available, the customer takes a seat.
www.cse.buffalo.edu /~bina/cse421/spring2005/Project2.doc   (1179 words)

 Solutions to Problem Set 2
If additional customers arrive while the barber is cutting a customer's hair, they either sit down (if there are empty chairs) or leave the shop (if all chairs are full).
When the barber is through with a customer, he looks to the waiting room to see if there are any more customers.
If there are, the next customer is told that the barber is ready, so the customer then goes to the barber for a haircut.
ei.cs.vt.edu /~cs5204/fall99/Problems/Solutions/SolutionToProblemSet2.html   (985 words)

 CS354 - Operating Systems
In the expansion he is going to add 2 more barber chairs (with narcoleptic barbers) and a cashier.
This extension to the Sleeping Barber problem from our text was inspired by a similar problem in "Operating Systems Internals and Design Principals: Third Ed." by William Stallings, (Prentice-Hall Inc., 1998).
This problem is a knock-off of the "Cigarette-Smokers Problem" from "Operating Sytems Concepts, Fifth Ed." by Silberschatz and Galvin (Addison Wesley, 1998).
www.dickinson.edu /~braught/courses/cs354s00/classes/class18.html   (448 words)

 [No title]
In this problem you are to compare reading a file using a single-threaded file server and a multithreaded server.
If a disk operation is needed, as is the case one-third of the time, an additional 75 msec is required, during which time the thread sleeps.
Explain the LL/SC mechanism for solving the CS problem (see slides) and show the code that uses it see also url:  HYPERLINK "http://www.cs.berkeley.edu/~culler/cs258-s99/slides/lec09/sld012.htm" http://www.cs.berkeley.edu/~culler/cs258-s99/slides/lec09/sld012.htm Solve the sleeping barber problem using Monitors.
www.cs.bgu.ac.il /~os022/targil1.doc   (272 words)

 Process Synchronization   (Site not responding. Last check: 2007-10-12)
All barbers can cut hair concurrently, but only one can use the dryer at one time.
If there are no customers waiting, the barbers sleep.
After barber completes his work then leave chair.
www.cse.iitd.ernet.in /~csd01428/barber.htm   (178 words)

 CS 4560 Assignments
Implement a solution to the Sleeping Barber problem (Exercise 6.11) using POSIX threads.
The barber thread should print a message whenever he or she wakes up, goes to sleep, starts to cut someone's hair, or finishes cutting someone's hair.
Submit a run or runs that feature the barber sleeping, and customers leaving when the shop is full.
www.mcs.csuhayward.edu /~tebo/Classes/4560/W06/assignments.html   (1411 words)

 CS2403: Assignment #3
The Sleeping-Barber Problem: A barber shop has one barber, one barber chair, and n chairs for waiting customers (if there are any) to sit in.
If there are no customers present, the barber sits down in the barber chair and falls asleep.
The problem is to program the actions of the barber and his customers without getting into race conditions.
www.cs.unb.ca /~nwebber/CS2403/assignments/assignment3.html   (253 words)

 Modern Operating Systems Reading Notes
Problem with this is that its not wise to give processes control over interrupts; you may not be able to predict exactly what will happen.
This is a compiler command that does the Test and Set in one command, and avoids race condition by disabling all interrupts as its called.
The one problem he mentions with this is what he calls the Priority Inversion problem.
mason.gmu.edu /~wwagner/ModOpSysCh2.htm   (2343 words)

 COMP 340 - Assignment 3   (Site not responding. Last check: 2007-10-12)
(50 marks) Using the sleeping barber is a model, consider The Cigarette-Smokers Problem where there are three smokers and one agent process.
(50 marks) Using the sleeping barber is a model, consider The Santa Claus Model 5.22 p 262.
Prepare your answers using the sleeping barber problem in the handout from class as a guideline.
www.ucfv.bc.ca /cis/drysdales/340a4.html   (484 words)

 Laboratory Exercises For Computer Science 295
While this program presents code that solves the Producers/Consumers Problem, the program is incomplete for it does not contain any comments.
The Sleeping-Barber Problem: A barbershop consists of a waiting room with n chairs, and the barber room containing the barber chair.
It is acceptable to have multiple processes reading the data base at the same time, but if one process is writing (i.e., changing) the data base, no other processes may have access to the data base, not even readers.
www.math.grin.edu /~walker/courses/295.sp97/lab7.html   (773 words)

 Monitor Programming Assignment   (Site not responding. Last check: 2007-10-12)
Write a multi-class multithreaded Java program that simulates multiple sleeping barbers, all in one barbershop that has a finite number of chairs in the waiting room.
In other words, if barber A finishes cutting a customer followed a bit later by barber B finishing cutting, it is acceptable for barber B to get another customer to cut before barber A. Input Data
These represent the number of customers, the number of barbers, the upper bound on customer hair growing time for the random number generator, the upper bound on hair cutting time for the random number generator, the number of waiting room chairs, and the simulation runtime, respectively.
www.mcs.drexel.edu /~shartley/ConcProgJava/Labs/sleepingBarbersMON.html   (377 words)

 [No title]
Provide an example problem that is best solved by that paradigm.
Workflow problems can be solved with this paradigm.
b) In the Sleeping Barber problem, we started off with counters (like taking a ticket number at a store) and we incremented them whenever someone entered the barber shop.
www-scf.usc.edu /~csci599c/oldmidterm.doc   (683 words)

 Sleeping problems,insomnia problem sleeping.
Rather than just popping a pill which can be habit forming and lead to more sleep problems in the long term, try these sleeping tips.
The heat of the water relaxes the muscles and also causes the core body temperature to drop afterwards which sends a sleep signal to the brain.
Our brains are hard wired to go to sleep when it's dark and wake when its light.
www.neptunicum.com /page91.htm   (315 words)

 exam2   (Site not responding. Last check: 2007-10-12)
Using enable/disable interrupts to solve the critical section problem is not a good solution because:
Which one of the following is not a process synchronization problem.
Consider the procedure put_forks in the solution to the dining philosophers problem.
www.cs.ecu.edu /~gopal/os1/exam2/exam2.html   (797 words)

In solving the dining philosophers problem be sure to treat each philosopher as an independent entity acting on his or her own schedule.
When there is no customer waiting the barber sits in the barber chair and usually takes a nap.
When the barber finishes a haircut and the customer has left the chair, the barber will check for any waiting customers.
www.cs.rit.edu /~icss544/Threads.html   (1732 words)

As a reminder, the barbershop consists of a waiting room with n chairs and the barber chair.
If the barber is busy and there are free chairs, the customer sits in one of the chairs.
Note that I have added to logic to synchronize the payment to the barber and the issuing of a receipt back to the customer.
www.cs.fit.edu /~dclay/OSques/procsync4.htm   (160 words)

 CSE 120 (Fall 2004) -- Homework #2
If the barber is asleep, the customer wakes up the barber.
The mutex and condition variable have the semantics described at the end of the "Semaphore and Monitor" lecture in the ping_pong example, and as implemented by you in Project 1.
[Chase] This problem asks you to implement an Event synchronization primitive similar to the fundamental coordination primitives used throughout Windows NT.
www-cse.ucsd.edu /classes/fa04/cse120/hw/hw2.html   (804 words)

 Parallel programming
I have to write a pseudocode of this two problems: - The Sleeping-Barber Problem.
A barbershop consists of a waiting room > with n chairs and the barber room containing the barber chair.
If the barber is busy but chairs are available, then > the customer sits in one of the free chairs.
www.codecomments.com /message318209.html   (1206 words)

 Project Two   (Site not responding. Last check: 2007-10-12)
In particular we will carefully consider how semaphores can be used to solve the Producer-Consumer Problem and the Sleeping Barber Problem.
You should actually run this program many times (a few dozen) and note how it occasionally lets the producer have a long run followed by a long run for the consumer.
I'm sure I've had this experience somewhere sometime myself.) Statements about the barber should be printed by the parent process.
www.drake.edu /mathcs/rieck/Spring2006/cs160/p2.html   (759 words)

 foil on monitor solution to Exercise 11-9 sleeping barber problem   (Site not responding. Last check: 2007-10-12)
foil on monitor solution to Exercise 11-9 sleeping barber problem
customers : condition :=0; % for the barber to wait for a customer
barber : condition := 0; % for a customer to wait for the barber
www.cl.cam.ac.uk /Teaching/2000/ConcSys/csig2/79.html   (141 words)

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