Here is a more detailed explanation of how and when they are related and when not: <a href="http:&#x2F;&#x2F;stackoverflow.com&#x2F;questions&#x2F;9238326&#x2F;system-call-and-context-switch" rel="nofollow">http:&#x2F;&#x2F;stackoverflow.com&#x2F;questions&#x2F;9238326&#x2F;system-call-and-c...</a>