Which one or more of the following need to be saved on a context switch from one thread (T1) of a process to another thread (T2) of the same process?

Page table base register
Stack pointer
Program counter
General purpose registers

Correct answer: Stack pointer

Solution

The stack pointer must be saved during a context switch because it indicates the current position in the stack for the thread, which is essential for maintaining the correct execution state when switching between threads.

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