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Last Update: November 08, 2008 Asked by: Debajyoti Ghosh |
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Submitted by: sk_seeker
Execution contexts can be of two types: thread/process context OR an Interrupt context. What this means is that to execute code, one has to be in a thread context or a an Interrupt context. OS code or any code for that matter has no context. It is the execution stream that has a context. So, whenever we are executing OS code, we are doing so on behalf of one of the two contexts mentioned above.
The behavior of the OS is controlled by user requests via system calls, by interrupt requests and by the policy and mechanisms put in place to manage resources, provide protection, etc.
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