United States International University (USIU - Africa)
APT 2040
-
Spring 2015
Batch Scripts
Example 1 Creating a script
md lesson1
copy list1.txt .\lesson1
cd lesson1
dir
cd.
Example 2 - @echo of
rem Review & Displaying
@echo of
Echo "My second batch file"
Example 3 input & output
rem User Input
@echo of
set /p name=What is your
United States International University (USIU - Africa)
APT 2040
-
Spring 2015
Submit printed copies of your source programs and the sample screen of the running
programs.
Question 1
a) Write C code to sum the elements of an array of int. Use it to sum the array
int a[] = cfw_1, 2, 3, 4, 5, 6;
(The answer, of course, should be 21).
United States International University (USIU - Africa)
APT 2040
-
Spring 2015
Write a program to enter student names and three assignment marks into three arrays (array1=names;
array2=Asg1; array3=Asg2) and compute the total assignment and place it in fourth array
(array4=TotalAsg).
Compute the average class score for each assignme
United States International University (USIU - Africa)
APT 2040
-
Spring 2015
QUESTION1
Consider the following set of processes, with the length of the CPU-burst time given in
milliseconds:
Process
Burst Time
Arrival Time
Priority
P1
12
0
2
P2
5
2
4
P3
2
4
1
P4
3
5
3
P5
4
6
4
The processes are assumed to have arrived in the order i
United States International University (USIU - Africa)
APT 2040
-
Spring 2015
OPERATING SYSTEMS
BY L. Mutanu Mwaura
Process Control Block
Process - a program in
execution
process execution proceeds in
a sequential fashion
Contains information associated
with each process
Process State - e.g. new, ready,
running etc.
Process Nu
United States International University (USIU - Africa)
APT 2040
-
Spring 2015
INTRODUCTION TO SYSTEM PROGRAMMING
Contents
Threads.1
Creating a thread.1
Making a thread wait.1
Creating multiple threads.2
Threads
NB: Compile the program as follows:
gcc myprog.c -o myprog -lpthread
Creating a thread
#include <pthread.h>
#include <stdi
United States International University (USIU - Africa)
APT 2040
-
Spring 2015
Process
A process is basically a program in execution. The execution of a process
must progress in a sequential fashion.
A process is defined as an entity which represents the basic unit of work to be
implemented in the system.
To put it in simple terms,
United States International University (USIU - Africa)
APT 2040
-
Spring 2015
INTRODUCTION TO SYSTEM PROGRAMMING
Contents
Processes.1
Create a child processes.1
Assigning different tasks to child.2
Making Parent Wait for child.2
Processes
Create a child processes
#include <stdio.h>
#include <unistd.h>
int main()
cfw_
fork();
printf
United States International University (USIU - Africa)
APT 2040
-
Spring 2015
OPERATING SYSTEMS
BY L. Mutanu Mwaura
Process Control Block
Process - a program in
execution
process execution proceeds in
a sequential fashion
Contains information associated
with each process
Process State - e.g. new, ready,
running etc.
Process Nu
United States International University (USIU - Africa)
APT 2040
-
Spring 2015
OPERATING SYSTEMS
BY L. Mutanu Mwaura
CH1: OVERVIEW OF OPERATING SYSTEMS
Compiled by L. Mutanu
What is the operating system?
2
CH1: OVERVIEW OF OPERATING SYSTEMS
Compiled by L. Mutanu
An OS is a program that acts an
intermediary between the user of a
com
United States International University (USIU - Africa)
APT 2040
-
Spring 2015
OPERATING SYSTEMS
BY L. Mutanu Mwaura
CH2: OPERATING SYSTEM SRUCTURE
Computer System Architecture
Device Controllers
Each device controller is in
charge of a particular
device type
Each device controller
has a local buffer. I/O is
from the device to loc
