An interactive web-based visualization tool for understanding thread lifecycle states and transitions. This educational tool helps students visualize and interact with the different states a thread can be in during its lifecycle.
- Interactive visualization of thread lifecycle states
- Real-time state transitions with animations
- Multiple thread creation and management
- Detailed explanation of each thread state
- Transition log to track state changes
- User-friendly controls to manipulate thread states
- Thread scheduling simulation with multiple algorithms
- Enhanced concurrency issue demonstrations with step-by-step visualizations:
- Race conditions with memory access visualization and timeline
- Deadlocks with circular dependency visualization and resource tracking
- Livelocks with cyclic behavior visualization and attempted resource acquisitions
- Shared memory visualization and access patterns
- Interactive tutorials with step-by-step guidance
- Comprehensive help center with educational content
- Detailed explanations of concurrency issues with code examples and solutions
- New - Thread is created but not yet started
- Runnable - Thread is ready to run when given CPU time
- Running - Thread is currently executing
- Blocked - Thread is waiting for a monitor lock
- Waiting - Thread is waiting indefinitely for another thread
- Timed Waiting - Thread is waiting for a specified time
- Terminated - Thread has completed execution
- Create New Thread - Creates a thread in the "New" state
- Start Thread - Transitions a thread from "New" to "Runnable"
- Resume - Transitions a thread from "Runnable" to "Running"
- Pause - Transitions a thread from "Running" to "Runnable"
- Sleep - Transitions a thread from "Running" to "Timed Waiting"
- Wake Up - Transitions a thread from "Waiting/Timed Waiting" to "Runnable"
- Block - Transitions a thread from "Running" to "Blocked"
- Unblock - Transitions a thread from "Blocked" to "Runnable"
- Terminate - Transitions any thread to "Terminated"
- Navigate to the project folder
- Open the
open_visualizer.htmlfile with your browser
-
On Mac/Linux:
- Open Terminal in the project folder
- Run
chmod +x run_visualizer.sh(first time only) - Run
./run_visualizer.sh
-
On Windows:
- Double-click
run_visualizer.bat
- Double-click
To test the visualizer across multiple browsers:
# Make the script executable first
chmod +x browser_test.sh
# Run the test script
./browser_test.shThis will attempt to open the visualizer in Chrome, Firefox, Safari (macOS only), and Edge (if available) for cross-browser testing. Use the included test_plan.md to document your testing results.
- Click "Create New Thread" to create a new thread
- Click on any thread to select it
- Use the control buttons to transition the selected thread between states
- Watch the transition log to track state changes
- Click the tutorial button (graduation cap icon) to start interactive tutorials
- Click the help button (question mark icon) to open the educational help center
- Try the concurrency demonstrations to understand common concurrency problems
- N - Create New Thread
- S - Start Thread
- P - Pause
- R - Resume
- Z - Sleep
- W - Wake Up
- B - Block
- U - Unblock
- T - Terminate
- H - Toggle Help Center
- G - Toggle Tutorial Guide
The visualizer includes a comprehensive tutorial guide with step-by-step instructions for:
- Thread basics and states
- Working with multiple threads
- Understanding thread scheduling
- Exploring concurrency issues
- Using shared memory
An in-depth help center provides detailed explanations on:
- Thread lifecycle states
- State transitions
- Common threading problems
- Best practices for thread management
Interactive demonstrations of common concurrency issues with detailed visualizations:
- Step-by-step execution tracking with detailed explanations for each step
- Visual timeline showing thread events with timestamps
- Memory access visualization showing reads and writes
- Resource value tracking and updates
- Clear explanation of the race condition outcome
- Solution box with synchronized code example
- Step-by-step progress tracking with detailed explanations
- Visual timeline showing resource acquisition and waiting
- Clear resource ownership indicators
- Wait visualization showing blocked threads
- Deadlock detection with visual dependency diagram
- Solution with consistent lock ordering example
- Step-by-step progression with detailed explanations
- Timeline showing repeated resource acquisition attempts
- Resource release visualization during conflict avoidance
- Visual representation of continuous cycle without progress
- Comparison with deadlock behavior
- Solution with randomized backoff strategy
Each demonstration includes:
- Detailed explanations for every step of the visualization
- Color-coded timeline events for different threads
- Interactive visual indicators for resource access
- Code examples for both problematic and fixed implementations
The Thread Lifecycle Visualizer is fully responsive and works well on mobile devices:
- Optimized layouts for tablets and phones
- Special optimizations for very small screens (under 375px)
- Touch-friendly controls and buttons
- Simplified views for better mobile experience
- Accessible educational content on all devices
This project can be easily deployed to GitHub Pages:
- Fork this repository
- Go to the repository settings
- Navigate to "Pages" in the sidebar
- Select the main branch as the source
- Click "Save"
Your visualization will be live at https://[your-username].github.io/thread-lifecycle-visualizer/
To test the integration of all components:
npm test
or run directly:
./test_integration.sh
This will verify that all necessary files are present and properly linked, then start a local server for manual testing.
This project is built using:
- HTML5
- CSS3
- Vanilla JavaScript (ES6+)
No external libraries or frameworks are used, making it lightweight and easy to understand.
MIT License - Feel free to use, modify, and distribute this project for educational purposes.
Contributions are welcome! Please feel free to submit a Pull Request.