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mthOS

An Operating System simulator written in C

Functions simulated:

  • Process scheduling
  • Interrupts
  • Semaphores
  • Memory management / paging
  • I/O requests

About the program file structure

The synthetic program files must obey the following format:

file.prog:

programName
segmentID (not used)
priority (not used)
amount of memory needed by program (in kbytes)
list of semaphores used by the program (single character, separated by spaces)

<operations>

Simulation of the following operations is supported:

  • exec t: execute for t units of time
  • read k: read track k (for k units of time)
  • write k: write on track k (for k units of time)
  • P(s): wait on semaphore s
  • V(s): post semaphore s
  • print t: print for t units of time

This file must have lines separated exclusively by Line Feeds (no carriage returns allowed)

How to check for Carriage Returns

you can run the following command to check if your program contains CR characters:

xxd -b <programFilename> | grep 00001101 &> /dev/null && echo "has CRs" || echo "has no CRs"

Remove Carriage Returns from file

To remove all carriage return characters from your program files, run the following command:

sed -i s/$(echo -e "\x0D")//g <programFilename>