THE DOCUMENT HAS YOUR ASSIGNMENT GUIDE FOR THE CURRENT SEMESTER. THE SOLUTIONS ARE COMPILED AS PER UNISA STANDARDS AND REGULATIONS. HENCE IT WILL MAKE IT EASY FOR YOU TO COMPILE YOUR OWN ASSIGNMENTS.
Assignment 1 – COS 3721
UNISA
UNIQUE NUMBER…………………
STUDENT NUMBER ……………….
, Question 1 – Based on Chapter 1 of SGG
1.1 What is the purpose of interrupts? How does an interrupt differ from a trap? Can
traps be generated intentionally by a user program? If so, for what purpose?
Answer: An interrupt is a hardware-generated change-of-flow within the system. An interrupt
handler is summoned to deal with the cause of the interrupt; control is then returned to the
interrupted context and instruction. A trap is a software-generated interrupt. An interrupt can be
used to signal the completion of an I/O to obviate the need for device polling. A trap can be used
to call operating system routines or to catch arithmetic errors.
1.2 Describe some of the challenges of designing operating systems for mobile devices
compared with designing operating systems for traditional PCs.
Besides a core kernel, middleware must be designed in mobile operating systems to
support a set of software frameworks that provide additional services to application
developers.
Different from using a physical keyboard and mouse, mobile devices need to
features a touch screen and let user interact with the system by pressing and swiping
fingers across the screen.
Mobile operating system must balance the performance with the battery life
Mobile operating system must have a good support for external peripheral devices
like GPS, HDMI which is essential for mobile devices.
Mobile operating system must consider the limited resources since the mobile
devices are much smaller compared with PC.
The mobile devices are more and more related to people's privacy, so the security of
the operating system for the mobile devices counts even more than the traditional
PCs and harder to prevent malicious code and access.
1.3 Identify several advantages and several disadvantages of open-source operating
systems. Include the types of people who would find each aspect to be an advantage or
a disadvantage.
Answer
The benefits of buying summaries with Stuvia:
Guaranteed quality through customer reviews
Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.
Quick and easy check-out
You can quickly pay through EFT, credit card or Stuvia-credit for the summaries. There is no membership needed.
Focus on what matters
Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!
Frequently asked questions
What do I get when I buy this document?
You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.
Satisfaction guarantee: how does it work?
Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.
Who am I buying this summary from?
Stuvia is a marketplace, so you are not buying this document from us, but from seller Abacus1995. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy this summary for R75,00. You're not tied to anything after your purchase.
