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1. Unix-shell Unix-shell Public

   A Unix shell in C: pipelines, redirection, job control and history, built on fork, exec, pipe and waitpid.

   C

2. xv6-shared-memory xv6-shared-memory Public

   xv6-riscv extended with cross-process shared memory (page-table level, PTE ownership bit) and a lock-free CAS-based multi-process logger

   C

3. Chess Chess Public

   Two-player chess in C++ with the full rules: castling, en passant, promotion, checkmate and stalemate. Play it in the console, or in the browser via WebAssembly.

   C++

4. xv6-process-syscalls xv6-process-syscalls Public

   New process system calls for xv6-riscv: forkn, waitall, memsize and exit messages, with tests that run in QEMU on CI

   C

5. xv6-tournament-lock xv6-tournament-lock Public

   xv6 kernel with Peterson locks and a tournament-tree lock for up to 16 processes, plus an interactive visualizer of the algorithm.

   C

6. Compact-routing-in-networks Compact-routing-in-networks Public

   Thorup-Zwick stretch-3 compact routing: each node stores only ~O(sqrt(n) log n) entries yet routes within 3x of the shortest path. Python implementation plus an interactive in-browser visualizer.

   HTML