Inter-process communication (IPC) is a mechanism that allows processes to:

Question

BlackTom AI · Accepted Answer

Inter-process communication (IPC) is the set of mechanisms that let separately running processes exchange information and coordinate their behavior. Relevant concepts include process address spaces, message passing, shared memory, and synchronization primitives (semaphores, mutexes, condition variables).

Step-by-step reasoning:
1. Processes normally run in isolated address spaces; to exchange data they must use OS-provided IPC facilities. Common IPC methods: pipes and FIFOs (unidirectional streams), message queues (structured messages), shared memory (fast data exchange region), sockets (networked or local communication), and signals (simple notifications).
2. Synchronization is essential when multiple processes access shared resources or communicate: semaphores and mutexes prevent race conditions; condition variables and barriers coordinate ordering (e.g., wait until data produced before consuming).
3. Because IPC provides both data transfer and coordination mechanisms, its primary purpose is to enable communication and synchronization between processes.

Why the correct answer is correct:
- Option b ("Communicate and synchronize their actions") directly describes the twin goals of IPC: transferring information and coordinating timing/ordering of actions. IPC primitives are explicitly designed for these tasks.

Why the other options are incorrect:
- Option a ("Access hardware directly"): Direct hardware access is controlled by the kernel and device drivers; user processes do not gain hardware access through IPC. IPC is for inter-process data exchange, not hardware control.
- Option c ("Manage memory independently"): Processes already have independent memory spaces by default. IPC is used when processes need to share or transfer data, not to manage memory independently.
- Option d ("Execute in parallel"): Parallel execution is a property of scheduling and available CPU cores/threads. IPC does not make processes execute in parallel; it enables them to communicate when they do.

Conclusion: IPC enables processes to communicate and synchronize their actions, so the correct choice is b.

Inter-process communication (IPC) is a mechanism that allows processes to:单项选择题

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