extended-xv6

An extended version of xv6 kernel with modified system calls, scheduling schemes, and synchronization and concurrency components.

Phase 1 (Introduction):

Printing our names after boot.
Added Ctrl+c, Ctrl+v, Ctrl+x, Ctrl+b.
Added a user program named lcm.

Phase 2 (System Calls)

Added new system calls: reverse_number, print_trace, get_children, trace_syscalls.

Phase 3 (CPU Scheduling)

Added multiple queue scheduling including RR, Lottery, and BJF.
Added aging to processes.

Phase 4 (Synchronization And Concurrency)

Implemented semaphores.
Implemented readers writers problem.