📄 cmps 111 homework #1.htm
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<H2>CMPS 111: Introduction to Operating Systems (Winter
2003)</H2></TD></TR></TBODY></TABLE>
<H2 align=center>Homework #1</H2>
<P align=left><B>Assigned:</B> 9 January<BR><B>Due:</B> 16 January at 8 AM. Late
homeworks will not be accepted.</P>
<P>Please read this <A
href="http://www.cs.ucsc.edu/~elm/Classes/111/w03/homework.shtml#submit">information</A>
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href="http://www.cs.ucsc.edu/~elm/Classes/111/w03/syllabus.shtml#honesty">academic
honesty policy</A> for this class.</P>
<OL>
<LI>What are the two main functions of an operating system?
<LI>On early computers, each word of data transferred to or from a device was
directly handled by the CPU (<I>i.e.</I>, no DMA). What implications (if any)
does this have for multiprogramming?
<LI>The basic Intel x86 design was set in the mid 1980's (if not earlier). Why
are we still using this design nearly two decades later?
<LI>List some differences between personal computer operating systems and
mainframe operating systems. Is this difference disappearing?
<LI>Which of the following operations should be allowed only in kernel mode?
Explain your decision for each one briefly.
<OL type=a>
<LI>Disable all interrupts
<LI>Cause a trap
<LI>Read the time-of-day clock
<LI>Set the time-of-day clock
<LI>Read the memory map for the current process </LI></OL>
<LI>For each of the following system calls, give a condition that causes it to
fail:
<OL type=a>
<LI>wait() [ also known as waitpid()]
<LI>exec()
<LI>unlink()
<LI>write() </LI></OL>
<LI>To a programmer, a system call looks like any other call to a library
procedure. Is it important that a programmer know which library procedures
result in system calls? Under what circumstances, and why? </LI></OL>
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<ADDRESS>Last updated 9 Jan 2003 by <A href="http://www.cs.ucsc.edu/~elm/"
target=_blank>Ethan L. Miller</A> (elm at cs xxx ucsc xxx edu [replace xxx with
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