Built up handful of handy features from a bare bones (single-process, almost no syscalls) operating system.

• Implemented userspace
  • Processes, threads, page faults, and appropriate syscalls
• Implemented thread priority
  • Scheduling, timers, deadlock avoidance in synchronization primitives
• Implemented a file system
  • Inodes, path resolution, caching, and appropriate syscalls

For prospective students: this class is fun, but fun and difficult aren’t mutually exclusive.

Source | Highly Recommended Reading

Guide to introduce high school students to microcontroller programming for VEX Robotics competitions.