GATE CS 2024 Set 1 Q.24: Processes, Threads and System Calls

Which of the following statements about threads is/are TRUE?

Threads can only be implemented in kernel space

Each thread has its own file descriptor table for open files

All the threads belonging to a process share a common stack

Threads belonging to a process are by default not protected from each other

Official answer and solution

Official answer: D
From: Official GATE 2024 answer key

Solution

Examine what resources threads of the same process share (address space, heap, open files) versus what each thread owns privately (stack, registers, program counter).

(A) is FALSE: Threads can be implemented in user space (user-level threads), in kernel space (kernel-level threads), or in a hybrid manner.
(B) is FALSE: All threads of a process share the process's open file descriptor table.
(C) is FALSE: Each thread has its own private execution stack (for its local variables and function call frames).
(D) is TRUE: Because all threads within a process share the same virtual address space, any thread can read or write memory accessible to other threads in the same process; there is no hardware memory protection between threads of the same process by default.

Final answer

Option (D)

The answer is the one in the official GATE answer key. The solution is this site's own explanation.

Source

Paper: GATE 2024 Computer Science and Information Technology - Set 1 (CS1)
Question: 24 of 65
Section: Computer Science and Information Technology

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