Compare RTOS Platforms

RTOS Comparison

See how LightOS compares to other popular RTOS platforms for silicon validation and embedded firmware.

Quick Comparison

Boot Time Comparison

LightOS: 5 FreeRTOS: 100 Zephyr: 1000 ThreadX: 50

Why boot time matters for silicon validation:

• Each RTL simulation run has fixed overhead
• Faster boot = more test iterations per regression
• LightOS boots 20x faster than FreeRTOS, 200x faster than Zephyr

Memory Footprint

Minimum Configuration

Typical Validation Configuration

Feature Comparison

Scheduler

Synchronization

Architecture Support

Developer Experience

API Style

LightOS (C++20):

#include <lightos/thread.hpp>

lightos::thread worker("Worker", priority::normal, [](void*) {
    while (true) {
        auto msg = queue.receive(timeout::infinite);
        process(msg);
    }
});
worker.start();

FreeRTOS (C99):

#include "FreeRTOS.h"
#include "task.h"

void worker_task(void* param) {
    while (1) {
        Message msg;
        xQueueReceive(queue, &msg, portMAX_DELAY);
        process(&msg);
    }
}
xTaskCreate(worker_task, "Worker", 256, NULL, 1, &handle);

Zephyr (C99):

#include <zephyr/kernel.h>

void worker_thread(void* p1, void* p2, void* p3) {
    while (1) {
        struct message msg;
        k_msgq_get(&queue, &msg, K_FOREVER);
        process(&msg);
    }
}
K_THREAD_DEFINE(worker_id, 1024, worker_thread, NULL, NULL, NULL, 5, 0, 0);

Testing & Quality

Use Case Fit

Silicon Validation

Embedded Firmware

Migration Guides

From FreeRTOS

• Similar threading model
• API mapping available
• FreeRTOS Migration Guide →

From Zephyr

• Device tree not required
• Simpler configuration
• Zephyr Migration Guide →

From ThreadX

• Familiar priority model
• Similar sync primitives
• ThreadX Migration Guide →

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