Because of virtual memory, the memory can be shared among

Question

BlackTom AI · Accepted Answer

Virtual memory uses page tables to map virtual addresses to physical frames, allowing the same physical page to be mapped into multiple processes’ virtual address spaces. Relevant concepts: virtual address space, physical frames, page tables, memory-mapped files/shared segments, and copy-on-write.

Step-by-step reasoning:
1. Each process is assigned its own virtual address space; the MMU and page tables translate those virtual addresses to physical frames.  
2. The OS can load a single physical page (for example, code from a shared library or a memory-mapped file) and create page table entries in multiple processes that point to that same physical frame. This is how sharing is implemented: different processes’ page tables reference the same physical memory.  
3. Shared memory APIs (mmap, System V shared memory) and dynamically linked libraries commonly rely on this mechanism. Shared pages are usually marked read-only or use copy-on-write so that a write by one process triggers duplication rather than corrupting another process’s view.  
4. Because of these mechanisms, memory can be shared among processes, saving RAM and enabling interprocess communication.

Why the correct answer (processes) is correct:
- Virtual memory provides independent virtual address spaces but also the ability to map common physical pages into multiple of those spaces. This explicit design enables processes to share memory safely and efficiently (e.g., shared libraries, shared memory segments).

Why other options are incorrect:
- Threads: threads within the same process already share the process’s address space; that sharing is a property of threads, not a reason enabled specifically by virtual memory. Virtual memory’s notable sharing capability is between distinct processes.  
- Instructions: this option is vague — instructions (code) can be shared, but the proper actor being shared is whole memory/pages among processes; the option is imprecise.  
- None of the mentioned: incorrect because virtual memory explicitly supports sharing among processes.

Conclusion: The correct answer is processes, matching the given answer.

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