Operating Systems 2016

This repository contains two course assignments for the Operating Systems university course for the academic period of 2016-2017 done by Panagiotis Charalampopoulos.

Assignment 1

Developed a minimal shell in C that has the following features:

• It reads the name of a program from the keyboard and if the program exists in any directory inside the $PATH variable, it executes it.
• It supports multiple parameters
• It provides an exit and a cd command that supports both absolute and relative paths as arguments.
• It supports multiple pipes using the | character.

Compilation Instructions

gcc -o mysh4 mysh4.c

Usage

./mysh4

Assignment 2

Performed process synchronization using semaphores and also thread synchronization using pthreads API's mutexes and condition variables in C in order to avoid race conditions when two or more processes or threads are using the same resource respectively.

Compilation Instructions

gcc syn_process_1.c display.c -o syn_process_1
gcc syn_process_2.c display.c -o syn_process_2
gcc -pthread syn_thread_1.c display.c -o syn_thread_1
gcc -pthread syn_thread_2.c display.c -o syn_thread_2

Usage

./syn_process_1
./syn_process_2
./syn_thread_1
./syn_thread_2

License

All files except assignment-2.pdf and assignment-3.pdf are licensed under the AGPL-3.0 license.

Copyright © Panagiotis Charalampopoulos