🚀 Executing Threads in a Specific Order: When to Use Multiple Threads vs. a Single Thread

Why Not Just Use a Single Thread? 🤔

A common question when dealing with multi-threading is: “Why not use a single-threaded executor to run tasks sequentially instead of multiple threads waiting for each other?”

🚀 Executing Threads in a Specific Order: When to Use Multiple Threads vs. a Single Thread

The answer lies in the nature of the problem. If tasks are fully sequential with no need for parallel execution, a single-threaded executor is fine. However, when you have groups of dependent tasks that can run in parallel, using multiple threads with synchronization (e.g., join()) becomes a better approach.

Real-World Scenario: Order Packing System 📦

Imagine a warehouse where orders are processed simultaneously. Each order consists of three steps that must be executed in a strict sequence: ✅ Step 1: Pack Item A
✅ Step 2: Pack Item B (after A)
✅ Step 3: Pack Item C (after B)

Now, let’s say we have 100 orders to process.

• Using a Single Thread: Orders would be processed one by one, causing delays.
• Using Multi-Threading: We can parallelize the orders while ensuring the steps within each order maintain the correct sequence.