ljr-ifsp / simos

Simulation of Operating System

simos

SIMulation of Operating System.

Code organization

To compile use

make

`simos' is a static library code. After compiling it, check

lib/libsimos.a

for the binary.

Directories in the project are:

• include/

  The directory include has `simos.h' which has the declaration and prototype of every resource available with simos.

• src/

  Directory containing the codes:

    * simos.c : basic functions to create simulations. Call these 
    	functions to write a simulator. It has a provisory
    	'time' variable to take care about the simulation time.
    	If you need to export this variable, try remove
    	'static' and declare it as 'extern' in the simulator.
  
    * memory.c: create an array of unsigned char representing cells
    	just like in real computer systems. In memory.c must be 
    	implemented memory management issues.
  
    * scheduler.c: has a 'ready' process list and functions to add 
    	and remove process to the simulated system. Scheduling 
    	policies must be implemented in this file. As a good 
    	practice is suggested to put the next process in the 
    	head of the list. To implement preemptive issues, 
    	the processor exiting process must be inserted again,
    	so the insert algorithm should tackle with position 
    	where the process will be placed in the list. For
    	example, for the Round-robin policy, just insert a
    	process in the very last position.
  
    * process.c: process' structure. Information of the process. 
    	Add metrics here. For example, insert arrival_time in
    	the system.
  
    * list.c: a generic approach for the list of process. Sometimes
    	it will be hard to distinguish if a code should be 
    	inserted in scheduler.c or list.c. A simple guideline 
    	is: whether code is not dependent of the policy, put it
    	in list.c, otherwise in scheduler.c. 
  

• examples/

  Directory containing examples of use. Check `simulation.c' for a simple FCFS non-preemptive simulation.

Author

The code was spawned in Sep 7, 2013 by

Lourenco Alves 
São Paulo's Federal Institute of Technology
Araraquara, SP - Brazil
(ljr[dot]ifsp gmail)
http://ljr.sdf.org

This project is intented to help Operating System classes by enabling a simple but sufficient start up for labs like Scheduling policies and Memory management implementations.

You are strongly encouraged to report bugs and contribute to this project.

Long live and prosper.

\\//