Which of the following statements about threads is/are TRUE?(A) Threads can only be implemented in k

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Question

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

Accepted Answer

Correct Answer: (D) onlyConcept -- Thread Properties (from Abraham Silberschatz, Peter Galvin, and Greg Gagne, Operating System Concepts):(A) FALSE: Threads can be implemented at both the user level (user-level threads, managed entirely by a runtime library without kernel involvement) and at the kernel level (kernel-level threads, managed by the OS). User-level threads (e.g., as in early POSIX thread libraries or green threads) require no kernel support.(B) FALSE: Threads within a process share the same file descriptor table. The file descriptor table is a per-process data structure, and all threads of a process see the same set of open file descriptors. Individual threads do NOT have their own file descriptor tables.(C) FALSE: Each thread has its own private stack (for local variables, return addresses, and function call frames). This is necessary because threads execute independently and may be at different points in their call chains simultaneously. What threads share is the heap, global data, code segment, and file descriptor table -- not the stack.(D) TRUE: All threads within a process share the same address space (code, heap, global variables). There is no hardware-level memory protection between threads of the same process. One thread can read or write another thread's stack, global variables, or heap memory by default. Protection between threads must be implemented explicitly using synchronization primitives.

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