The document provides an overview of the OSEK/VDX automotive software standard, including its key characteristics, specification, architecture, and concepts. It describes OSEK/VDX's scalability, portability, and configurability. It also explains the standard's three processing levels, four conformance classes, the concepts of basic and extended tasks, interrupt processing, event mechanism, and mixed preemptive scheduling policy.
43. the OSEK operating system switches to a higher-priority task, or interrupt occurs which cause the processor to switch to an interrupt service routine (ISR).
45. In contrast to basic tasks extended tasks are allowed to use the operating system call WaitEvent, which may result in a waiting state
46. The waiting state allows the processor to be released and to be reassigned to a lower-priority task without the need to terminate the running extended task