QNX's lean, efficient architecture lets you build high-performance applications using standard PC-class hardware. Less OS overhead, less hardware, less development time. It all adds up to more performance with QNX. Other trademarks are property of their respective owners. Customer Login. It's small, scalable, extensible, and fast. The microkernel at a glance The QNX microkernel handles process creation, memory management, and timer control. Embedded filesystem Our embedded filesystem, Efsys, comes in several versions.
Block filesystem Our block filesystem, Blkfsys , implements the full driver and user interface of the POSIX filesystem, but for block special files only. Device Management The QNX Device Manager, Dev , is a high-throughput, low-overhead server that provides the interface between all processes and terminal devices. Less means more QNX's lean, efficient architecture lets you build high-performance applications using standard PC-class hardware.
Data Files. Realtime applications, for instance, depend on the OS to handle multiple events and to ensure that the system responds to those events within predictable time limits.
QNX Neutrino is ideal for embedded realtime applications. It can be scaled to very small sizes and provides multitasking, threads, priority-driven preemptive scheduling, and fast context-switching — all essential ingredients of an embedded realtime system. QNX Neutrino is also remarkably flexible. Developers can easily customize the OS to meet the needs of their applications.
QNX Neutrino achieves its unique degree of efficiency, modularity, and simplicity through two fundamental principles:. Buzzwords often fall in and out of fashion. Vendors tend to enthusiastically apply the buzzwords of the day to their products, whether the terms actually fit or not.
Let's try to define the term. A microkernel OS is structured as a tiny kernel that provides the minimal services used by a team of optional cooperating processes, which in turn provide the higher-level OS functionality. The microkernel itself lacks filesystems and many other services normally expected of an OS — those services are provided by optional processes.
Modularity is the key, size is but a side effect. With the exception of those IPC services, a microkernel is roughly comparable to a realtime executive, both in terms of the services provided and in their realtime performance.
The microkernel differs from an executive in how the IPC services are used to extend the functionality of the kernel with additional, service-providing processes. Since the OS is implemented as a team of cooperating processes managed by the microkernel, user-written processes can serve both as applications and as processes that extend the underlying OS functionality for industry-specific applications.
Moreover, user-written extensions to the OS won't affect the fundamental reliability of the core OS. Such an environment is only a subset of the multi-process model that POSIX assumes; it cannot support the fork function. As the following diagrams show, a true microkernel offers complete memory protection , not only for user applications, but also for OS components device drivers, filesystems, etc.
With each successive product revision, we have applied the experience from previous product generations to the latest incarnation: QNX Neutrino, our most capable, scalable OS to date. We believe that this time-tested experience is what enables the QNX Neutrino OS to deliver the functionality it does using the limited resources it consumes.
The kernel is the heart of any operating system. But our microkernel is truly a kernel. First of all, like the kernel of a realtime executive, it's very small.
Secondly, it's dedicated to only a few fundamental services:. The only thing a component can crash is itself. Such crashes can be easily detected, and, since the kernel is unaffected, the faulty component can be restarted while the system is running with minimal impact on performance.
In short, in the event of a kernel crash in a monolithic kernel system the only response is to reboot the system, while with a microkernel OS the system can usually repair itself to provide a much better mean time between failures MTBF. The Biggs study examined all critical CVEs Common Vulnerability Enumeration, a popular vulnerability database known to be present in Linux in late , each vulnerability categorized based on how it would affect a microkernel OS.
Of the critical vulnerabilities, a microkernel would eliminate nearly a third, and more than three-quarters would be at least partially mitigated, with the following distribution and examples:. With the QNX RTOS, embedded systems designers can create compelling, safe, and secure devices built on a highly reliable RTOS serving as the foundation that helps guard against system malfunctions, malware and security breaches. BlackBerry uses cookies to help make our website better. Some of the cookies are necessary for proper functioning of the site, while others are to help us understand how you use it.
Read more here about our cookies, and how you can opt out. By continuing to use this site you accept our use of cookies. QNX Aviage software products accelerate your innovation by offering the following:. For more information about QNX Aviage middleware, contact your sales representative. Copyright Community.
Figure 1. The QNX Neutrino architecture. SMI interrupts may be generated by the motherboard or peripheral hardware, and can't be masked by the operating system.
0コメント