Which of the following statements about threads is/are TRUE? A) Threads can only be implemented in kernel space B) Each thread has its own file descriptor table for open files C) All the threads belonging to a process share a common stack D) Threads belonging to a process are by default not protected from each other

Official answer: D) Threads belonging to a process are by default not protected from each other. Explanation: Let us examine each statement about threads: - (A) is False: Threads can be implemented in user space (User-Level Threads / ULT), kernel space (Kernel-Level Threads / KLT), or as a hybrid combination of both. - (B) is False: All threads belonging to the same process share the process's open file table and file descriptor table. - (C) is False: Each thread has its own independent stack to maintain its function call frames, local variables, and return addresses, although they share the heap, data, and code segments. - (D) is True: Threads within a process share the same address space, so by default there is no hardware or OS-level memory protection between threads of the same process; any thread can read or modify another thread's accessible memory. Therefore, only statement D is TRUE.

A) Threads can only be implemented in kernel space

B) Each thread has its own file descriptor table for open files

C) All the threads belonging to a process share a common stack

Processes, Threads and IPC

GATE CSE 2024 Set 1 · Q24

MSQ1 markEasy

Time00:00

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

Select all that applyOne or more correct

Pick every correct option

Solution

Step-by-step verified solution

Official answer: D) Threads belonging to a process are by default not protected from each other

Processes, Threads and IPC

Let us examine each statement about threads:

(A) is False: Threads can be implemented in user space (User-Level Threads / ULT), kernel space (Kernel-Level Threads / KLT), or as a hybrid combination of both.
(B) is False: All threads belonging to the same process share the process's open file table and file descriptor table.
(C) is False: Each thread has its own independent stack to maintain its function call frames, local variables, and return addresses, although they share the heap, data, and code segments.
(D) is True: Threads within a process share the same address space, so by default there is no hardware or OS-level memory protection between threads of the same process; any thread can read or modify another thread's accessible memory.

Therefore, only statement D is TRUE.

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This Processes, Threads and IPC previous year question is Q24 of the GATE CSE 2024 Set 1 paper. Find more GATE CSE PYQs on Processes, Threads and IPC in Operating Systems, or browse all GATE CSE PYQs.

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Processes, Threads and IPC in GATE CSE

Processes, Threads and IPC has 15 GATE CSE PYQs across 13 papers from 2011 to 2026. 4 of them are 1-mark MSQs like this one, and GATE CSE 2024 Set 1 has 2.

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Independent practice explanation verified by the GateAI team. GATE is conducted by the IITs; question text follows the official paper.