40 Questions
What is the purpose of the sleep(10000) function in the Consumer class?
To wait for 10 seconds before starting work.
What is the main objective of the programming task in Exercise 2 - Lab 1 Preparation?
To develop the control program for an alarm clock.
What are the three main parts of the interface between the control software and the hardware?
Input, Output, and Time.
What is the name of the package that models the functionality of the hardware?
done
What is the purpose of the Buffer class in the given code?
To hold and manage data for the consumer thread.
What is the purpose of the run() method in the Consumer class?
To start the execution of the consumer thread.
Why is the try-catch block used in the run() method of the Consumer class?
To handle exceptions and let the thread terminate.
What is the role of the emulator in the laboratory session?
To emulate the hardware for testing the control software.
What is started by the simulator after creating an instance of the AlarmClock class?
A new thread.
What method does the new thread start executing?
The AlarmClock.run() method.
What is the purpose of the ClockInput interface?
To handle user actions via hardware/software.
What is the purpose of the ClockOutput interface?
To display information on the hardware/software.
What is the purpose of the AlarmClock class?
To implement the actual alarm clock software.
What happens when the applet is stopped?
There is a call to control.terminate().
What is the purpose of the doAlarm() method?
To wake up the clock user.
What is needed to fulfill the optional specification item 5?
To override the terminate() method.
What is the primary objective of the lab preparation in designing a real-time system for the AlarmClock?
To design a real-time system for the AlarmClock using threads, semaphores, and provided hardware interfaces.
What are the two Java packages provided in the handout code for the AlarmClock assignment?
The two packages are 'done' and 'todo'.
What is the limitation of the ClockOutput.doAlarm() method in the provided code?
It only makes one beep.
What is the purpose of the Semaphore object in the AlarmClock class?
It is used for synchronization and mutual exclusion.
What is the effect of calling sleep(1000) in a thread to wait for the next second?
It will cause the clock time to be inaccurate.
What type of data structures are needed to support concurrent access from different threads?
Global data structures with mutual exclusion using semaphores or mutexes.
What is the purpose of the MutexSem class in the provided code?
It is used to implement mutual exclusion and synchronization.
What is the primary goal of the AlarmClock class in the provided code?
To implement a real-time system that beeps upon key presses.
What is the primary concern in developing the GUI classes, and how does this impact the control software?
The primary concern is ensuring the classes developed will run on real hardware without changes to the source code, and as a result, these classes cannot be accessed from the control software.
How frequently should the displayed clock time be updated, and what happens when the user selects Set alarm or Set time?
The displayed clock time should be updated every second, and when the user selects Set alarm or Set time, the hardware/emulator shows the set time and an update of the clock time will have no effect on the clock.
How are synchronization and mutual exclusion handled in this system, and what is the purpose of this approach?
Synchronization and mutual exclusion are handled using semaphores, which allows for efficient and safe concurrent access to shared resources.
What happens when the clock time equals the alarm time and the Alarm on is selected, and how can the alarm sound be terminated?
The alarm should beep once a second for 20 seconds, and the sound can be turned off by pushing any button while the alarm is sounding.
How is the user's input handled when setting the clock time or alarm time, and what is the role of the ClockInput object?
The user's input is handled internally by the hardware/emulator, and the set value is written to the ClockInput object, which triggers the semaphore's give method.
What is the purpose of the additional information panel below the actual clock panel, and how does it impact testing?
The additional information panel displays the clock time for verification and convenience during testing, ensuring that the software accurately keeps track of time.
What programming language and concurrency mechanism are required for this system, and why?
The program should be written in Java, using the Thread class, and all synchronization and mutual exclusion should be achieved by using semaphores.
How does the system handle the transition between modes, such as when the user selects another mode after setting the alarm or clock time?
When the user selects another mode, the set value is written to the ClockInput object and the semaphore's give method is called.
What is the purpose of the Semaphore in the ClockInput class?
To signal when the user has changed any setting.
What is the return type of the getSemaphoreInstance() method?
Semaphore
What is the purpose of the alarmOn attribute in the ClockInput class?
To indicate if the alarm is activated according to the checkbox.
What is the purpose of the getAlarmFlag() method?
To get the checkbox state.
What is the purpose of the getChoice() method?
To get the radio-button choice.
What is the format of the return value of the showTime() method?
hhmmss, where h, m, and s are hours, minutes, and seconds digits respectively.
What is the purpose of the lastValueSet attribute in the ClockInput class?
To store the last value set by the user.
What is the purpose of the SET TIME, SET ALARM, and SHOW TIME constants?
To represent the different states of the clock display.
This quiz is about Java multithreading, focusing on the consumer thread and its interaction with a buffer. It covers the implementation of a consumer thread and its run method.
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