QNX and VxWorks are real-time operating systems that perform different functions. They mainly used in industrial and academic environments. The main difference is the architecture they are based on, where QNX is based on passing messages while VxWorks lends itself to share memory architecture.
QNX is a microkernel-based operating system; it is a small operating system that leverages system calls to manage the services, while VxWorks is a monolithic kernel operating system which manages all basic server and user services.
QNX was developed in the early 1980s, which was first developed by the Quantum software systems; it is a real commercial time operating system where elements on the Operating system run as tasks known as Resource Managers.
QNX is based on passing messages, while VxWorks was developed by a California based wind river systems, it is proprietary software, it is also self-contained. On QNX, all process has its own priority while on VxWorks uses only two types of schedule which are preemptive priority degree of control and round-robin scheduling.
QNX and VxWorks are two types of operating systems. Both are real time, but between the two QNX is used for commercial purposes. One difference between them is the architecture they are based on. QNX is based on the message passing architecture. VxWorks is based off shared memory architecture.
Another difference between them is the type of kernel it uses QNX uses a microkernel, while VxWorks uses a monolithic kernel. Along with the type of kernels it uses, VxWorks must exist in the same type of space, wheres QNX does not have any dependencies on the type of software used.
If you are not familiar with these, these are known to be software system tools that you can use. They do come with some differences. QNX will work in such a way that it is a message-passing architecture. VxWorks, on the other hand, will work differently. It will provide shared memory architecture.
It is important for the message to be passed on within the system, especially if there are different people who would need to gain the proper information within a short amount of time.
The kernel that there are using is also different from each other. VxWorks uses a monolithic kernel, while QNX will use a microkernel OS. The basic services that will then be offered by the two are a bit different from each other.