What is the running state of a process?

Question

BlackTom AI · Accepted Answer

The running state of a process is when it is actively executing instructions on the CPU.

1. Relevant knowledge points and concepts
- Process states in an operating system typically include: new, ready, running, waiting/blocked, and terminated. 
- "Ready" means the process is prepared to run and is waiting in the ready queue for CPU allocation. 
- "Running" means the process has been dispatched by the scheduler and is currently using the CPU. 
- "Waiting/blocked" means the process cannot proceed until some event or I/O completes. 
- The scheduler moves processes between these states.

2. Step-by-step reasoning
- Examine each answer option and map it to the standard process-state definitions.
- Option A: "when process is scheduled to run after some execution" — this describes a process that is prepared to run or will be scheduled, which corresponds to the ready state (waiting for CPU), not running.
- Option B: "none of the mentioned" — only choose if none match the definition of running; other options do match other states, so this is not correct.
- Option C: "when process is unable to run until some task has been completed" — this matches the waiting or blocked state (waiting for I/O or event).
- Option D: "when process is using the CPU" — this exactly matches the definition of the running state.

3. Intermediate reasoning steps (no numeric calculations)
- Compare phrase-by-phrase: "using the CPU" = active execution → running.
- "Scheduled to run after some execution" = queued/prepared → ready.
- "Unable to run until some task completed" = blocked/waiting.

4. Why the correct answer is correct
- The running state explicitly denotes that the process is currently executing on the CPU. Being "using the CPU" is the defining attribute of running.

5. Why other options are incorrect
- Option A corresponds to the ready state, not running.
- Option C corresponds to the waiting/blocked state, not running.
- Option B is false because a correct matching option exists.

6. Conclusion
The correct answer is "when process is using the CPU", which matches the provided answer.

What is the running state of a process?单项选择题

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