Programming Assignment 4 CPU Scheduling


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Programming Assignment 4
CPU Scheduling
This project involves implementing several different process scheduling algorithms. The scheduler
will be assigned a predefined set of tasks and will schedule the tasks based on the selected
scheduling algorithm. Each task is assigned a priority and CPU burst. The following scheduling
algorithms will be implemented:
• First-come, first-served (FCFS), which schedules tasks in the order in which they request
the CPU.
• Shortest-job-first (SJF), which schedules tasks in order of the length of the tasks’ next
CPU burst
• Priority scheduling, which schedules tasks based on priority.
• Round-robin (RR) scheduling, where each task is run for a time quantum (or for the
remainder of its CPU burst).
Priorities range from 1 to 10, where a higher numeric value indicates a higher relative priority.
For round-robin scheduling, the length of a time quantum is 10 milliseconds.
Assignment: CPU Scheduler
The implementation of this project may be completed in C/C++, and program files are provided in
the source code download for the text. These supporting files read in the schedule of tasks, insert
the tasks into a list, and invoke the scheduler. The schedule of tasks has the form [task name]
[priority] [CPU burst], with the following example format:
T1, 4, 20
T2, 2, 25
T3, 3, 25
T4, 3, 15
T5, 10, 10
Thus, task T1 has priority 4 and a CPU burst of 20 milliseconds, and so forth. It is assumed that
all tasks arrive at the same time, so your scheduler algorithms do not have to support higherpriority processes preempting processes with lower priorities. In addition, tasks do not have to be
placed into a queue or list in any particular order. There are a few different strategies for organizing
the list of tasks, as first presented in Section 5.1.2. One approach is to place all tasks in a single
unordered list, where the strategy for task selection depends on the scheduling algorithm.
The file driver.c reads in the schedule of tasks, inserts each task into a linked list, and invokes
the process scheduler by calling the schedule() function. The schedule() function executes each
task according to the specified scheduling algorithm. Tasks selected for execution on the CPU
are determined by the pick NextTask() function and are executed by invoking the run() function
defined in the file. A Makefile is used to determine the specific scheduling algorithm that will be
invoked by driver. For example, to build the FCFS scheduler, we would enter make rr and would
execute the scheduler (using the schedule of tasks schedule.txt) as follows: ./fcfs schedule.txt
Refer to the README file in the source code download for further details. Before proceeding,
be sure to familiarize yourself with the source code provided as well as the Makefile
The program will be graded on the basic functionality, error handling and how well the
implementation description was followed. Be sure to name your programming project Note that documentation and style are worth 10% of the assignment’s grade!

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