Compared with other niches within the IT industry, operating systems may not seem especially exciting. The same OS platforms — Windows, Linux, and macOS — have dominated for decades. OS architectures and features evolve more slowly and are much less trendy than, say, cloud-native application design or generative AI.
Yet, there is one aspect of OS design that could turn into a cutting-edge feature for some use cases: real-time operating system (RTOS) capabilities. Although real-time OS platforms are not new, real-time operating systems may become increasingly important in areas such as edge computing and the internet of things (IoT).
Keep reading for a look at what real-time operating systems are and why they may become one of the next big things (or, at least, something you'll hear more about in coming years) in the world of tech.
What Is a Real-Time Operating System?
A real-time operating system is one capable of guaranteeing that certain tasks will be performed in as close to real time as possible.
If that sounds confusing, it might be because standard operating systems typically appear to operate in real time. Usually, if you tell a computer to start an application or copy a file, for example, it will do it right away. The process may take time to complete, but the OS response to your request appears to happen immediately.
In reality, though, there is always some delay between when you ask a computer to do something and when it actually starts to do it. The delays are often imperceptible to humans, but they exist nonetheless — and they can become more noticeable when a machine is under heavy load or receives many requests at once. If you have a hundred browser tabs open, for instance, you may notice a delay when you add another one, because it takes your computer time to switch away from the tasks running in the existing tabs and start the task of opening a new tab.
Real-time operating systems provide the ability to prioritize certain requests such that the computer begins handling them right away. Thus, instead of waiting for your computer to get around to opening a new browser tab on top of the hundred you already have running, a real-time operating system would allow you to tell the OS that opening a new tab is a top priority and to react to the request as quickly as possible.
It's important to note that real-time operating systems don't actually perform tasks in true real time. As with standard OSes, there will always be some delay between when a user makes a request and when the computer responds. Thus, the term real-time OS is something of a misnomer. However, the key difference between a real-time OS and a conventional OS is that a real-time OS is able to prioritize certain tasks so that delays are minimal.
How Do Real-Time Operating Systems Work?
There are different approaches to implementing real-time operating systems. But in general, an RTOS works by providing a special task scheduling system that allows users or applications to assign priority levels to tasks. When a task with a high priority is introduced, the RTOS recognizes it and begins responding to it immediately.
In contrast, the schedulers of traditional operating systems usually try to balance all requests equally, allocating resources in a way designed to guarantee the best overall performance across all tasks and processes. A real-time OS is different because it can prioritize certain tasks over others.
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