VxWorks has no processes[1]. It has tasks. Basically, you write kernel code, there's no user mode. [1] As someone mentioned, VxVorks 6 did introduce processes

VxWorks has no processes[1]. It has tasks. Basically, you write kernel code, there's no user mode. [1] As someone mentioned, VxVorks 6 did introduce processes and "usermode", called RTP. As with most features of VxWorks, you compile that into your image if you want the feature. But there's a lot of inertia, and much of the VxWorks stuff I see doesn't use RTP yet.