As per following link http://www.keil.com/support/docs/3901.htm?_ga=2.128675276.1303479980.1563395299-631801781.1552261077
System and Thread Viewer in MDK-ARM v5.23 and older versions doesn't support RTX v5.
As an alternative to System and Thread Viewer, you can use Component Viewer 'RTX RTOS' for RTX v5, as shown in this screenshot.
However in Keil MDK 5.17 i am seeing Missing dialog Options for Target — Debug — Manage Component Viewer Description Files option.
Is any one has success on this ?
Since MDK v5.21, the Component Viewer debug feature was introduced. That means all MDK versions older than v5.21 don't support the Component Viewer, because CMSIS v5.0.0 pack was introduced in MDK v5.22.
You can get more details in the release note http://www.keil.com/update/relnotes/MDK528a.htm
Got confuse with the online documentation: It could be more specific about the versions. Thanks for you respsonse.
yeah, you are right. http://www.keil.com/support/docs/3901 isn't really clear regarding this. We will modify it.