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Operating Systems — LowLevelCraft

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Operating Systems

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Operating Systems

Comprehensive curriculum covering process management, threads, concurrency, memory management, system calls, file systems, IPC, and building a mini kernel from scratch. Learn OS internals and systems programming.

~3150 Minutes 70 Challenges 7 Subtracks

Deep Dive

How Processes Actually Share the CPU

Multitasking is not magic. It is a rapid switching of contexts orchestrated by the kernel scheduler, and every switch has a cost that compounds in ways most programmers ignore.

8 min read·Read article →

Subtracks (7)

Process Management

How the OS creates, schedules, and terminates processes. Learn about fork(), scheduling algorithms, context switching, and process control blocks.

Threads & Concurrency

Multiple execution contexts sharing an address space. Implement green threads, mutexes with compare-and-swap, and synchronization primitives.

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Difficulty Progression

Easy5

Med24

Hard41

Inflection Point41 hard tasks ahead — take your time and refer to the article deep dives for context.

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Memory Management

How the OS virtualizes physical memory. Implement buddy allocator, slab allocator, page tables, and virtual memory.

10 tasks

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System Calls & Kernel Interface

The boundary between user space and kernel space. Learn raw syscalls, ptrace for tracing, system call interception, and kernel entry points.

File Systems

How data is organized and persisted on disk. Implement in-memory filesystems, directory structures, path resolution, and file operations.

Inter-Process Communication

How processes talk to each other. Implement pipes, shared memory, message queues, signals, and synchronization primitives.

Build a Mini Kernel

Capstone subtrack: build a functioning mini kernel from scratch. Learn the boot sequence, protected mode, GDT, IDT, PIC, timer, keyboard and serial drivers, VGA text mode, physical memory mapping, page tables, context switching, round-robin scheduling, and system call interfaces.