Nachos

We designed and implemeted some of the main OS mechanisms on top of the Not Another Completely Heuristic Operating System (Nachos). The mechanisms in which we worked on are:

• Console Input/output:
  • Asynchronous and synchronous.
  • PutChar system call.
  • EOF (End of File) Detection.
• Multithreading:
  • User Threads.
  • Several Threads per Process.
  • Automatic Termination.
• Virtual Memory:
  • Paging and Virtual Addresses.
  • Executing several user programs at the same time.
  • Implemeted a shell.
  • Dynamic Memory Allocation.
• File System:
  • Implemented a directory tree.
  • IOpen Files Table.
  • Concurrent Access to Files.
  • Implementing files of variable size.

This project was part of the Operating System course project during the first year of my Masters degree. Teammates: Lucas Demarne, Paul de Montleau, Lucas Gisselaire.