When a process executes a TRAP or is interrupted, the operating system uses a separate stack...
When a process executes a TRAP or is interrupted, the operating system uses a separate stack located in memory unavailable to user processes to execute any operating system code rather than the stack of the current process. Why might operating systems designers select this type of implementation?
Homework Answers
The reason for selecting this type of implementation is due to following reasons;-
- Suppose if OS uses same stack then the Process could crash OS, This is why the OS cannot trust the process.
- The operating system needs to give fairness to all the processes, a single process should not utilize CPU time.
- If there is load on Operating system i.e. too many processes are running at a time there must some memory left out so that the OS can have control over the Processes.
- There can be some malicious processes which if utilize the whole stack can affect the CPU i.e. could hang the CPU. So there must be some memory left to have control over such processes and protect the CPU.
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