Menene bambanci tsakanin process da thread?

Question

IT Interview Practice · Accepted Answer

**Process shiri ne mai keɓewa da nasa memory; thread kuwa raka'ar aiwatarwa ce da ke raba memory da wasu threads a cikin process ɗaya.** Process ɗaya na iya ƙunsar threads da yawa.

## Yadda yake aiki

- **Process**: nasa address space, file descriptors, da heap. An keɓe shi ta OS — crash ko kuskuren memory a process ɗaya ba zai iya lalata wani ba. Context switching da sadarwa (IPC) suna da tsada sosai.
- **Thread**: yana zaune a cikin process, yana raba heap ɗinsa da globals, amma yana da nasa stack da registers. Mai arha wajen ƙirƙira da canzawa, amma raba memory yana nufin kana buƙatar synchronization.

```text
Process A                     Process B
├─ heap (shared by threads)   ├─ heap
├─ Thread 1 (own stack)       └─ Thread 1
└─ Thread 2 (own stack)
   ↑ threads share heap → must lock shared data
```

## Misali

```python
import threading, multiprocessing
# Threads share 'counter' — needs a lock
counter = 0
threading.Thread(target=lambda: work(counter)).start()

# Processes get separate copies — isolated, pass data via IPC/queue
multiprocessing.Process(target=work, args=(data,)).start()
```

Scheduler yana ba threads lokacin CPU; OS yana haɗa threads a ƙarƙashin processes don mallakar albarkatu da keɓewa.

## Me ya sa yake da muhimmanci

Cinikin daidaito yana motsa zaɓin ƙira. Threads suna da sauƙi kuma suna raba bayanai kai tsaye amma suna haɗarin race conditions; processes sun fi aminci kuma suna scale a kan injina amma suna biyan farashin sadarwa. Sanin wannan yana bayyana, misali, dalilin da Python ke amfani da multiprocessing don kewaye GIL ga aikin CPU.

Yadda yake aiki

Misali

Me ya sa yake da muhimmanci

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