https://github.com/llefranc/42_philosophers

School project: introduction to the basics of threading a process and how to work on the same memory space.
https://github.com/llefranc/42_philosophers

42 42born2code 42paris 42school mutex philo philosophers semaphore threads

Last synced: 8 months ago
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School project: introduction to the basics of threading a process and how to work on the same memory space.

• Host: GitHub
• URL: https://github.com/llefranc/42_philosophers
• Owner: llefranc
• Created: 2020-10-27T10:02:49.000Z (almost 5 years ago)
• Default Branch: main
• Last Pushed: 2021-10-26T20:12:10.000Z (almost 4 years ago)
• Last Synced: 2025-01-16T21:40:24.989Z (9 months ago)
• Topics: 42, 42born2code, 42paris, 42school, mutex, philo, philosophers, semaphore, threads
• Language: C
• Homepage:
• Size: 1.54 MB
• Stars: 2
• Watchers: 1
• Forks: 1
• Open Issues: 0
• Metadata Files:
  • Readme: README.md

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README

          
# philosophers (@42Paris)

"I’ve never thought philosophy would be so deadly"

![Alt text](https://github.com/lucaslefrancq/42_philosophers/blob/main/philo_example.png)

## About

Philosophers is a project of the mandatory part of the cursus.

It's only made in C and the main goal was to understand how threads works in language C and use them to solve a logical problem.

The simulation will stop if all philosophers have eaten enough or if one philosopher die.

- There are three different version of the algorithm :

    - Philo_one is about using threads and mutexs

    - Philo_two is about using threads and semaphores

    - Philo_three is about using processes and semaphores

- Here is the [subject][1]

`This project was code for MACOS`

### Building and running the project

1. Download/Clone this repo

        git clone https://github.com/llefranc/42_philosophers.git

2. `cd` into the root directory, then `cd` into philo_x (one, two or three) and run `make`

        cd 42_philosophers/philo_one

        make

3.  run `./philo_x arg1 arg2 arg3 arg4 (arg5)` from the directory philo_x.

    - arg1 is the number of philosopher

    - arg2 is the time to die in ms

    - arg3 is the time to eat in ms

    - arg4 is the time to sleep in ms

    - arg5 (optional) is the number of time each philosopher needs to eat to end the simulation

    

## Sources

- [Programmation système en C sous UNIX (FR)][5]

- [Processus et threads (FR)][2]

- [Cours sur les threads (FR)][3]

- [Optimizing philo algo][4]

- [Comprendre les sémaphores (FR)][6]

- [How to use sempahores on fork processes][7]

[1]: https://github.com/lucaslefrancq/42_philosophers/blob/main/philosophers.en.subject.pdf

[2]: https://zestedesavoir.com/tutoriels/607/les-systemes-dexploitation/processus-et-threads/

[3]: https://cours.polymtl.ca/inf2610/documentation/notes/chap4.pdf

[4]: https://www.notion.so/philosophers-VM-c60be9c836084edfbcd9c07e29b429c4

[5]: https://pub.phyks.me/sdz/sdz/la-programmation-systeme-en-c-sous-unix.html#Lesthreads

[6]: https://sites.uclouvain.be/SystInfo/notes/Theorie/html/Threads/coordination.html

[7]: https://stackoverflow.com/questions/16400820/how-to-use-posix-semaphores-on-forked-processes-in-c