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Debugging Multithreaded C/C++ Code in Visual Studio Code (VS Code Tutorial for Developers)
Debugging multithreaded C and C++ code can be a nightmare — especially when dealing with race conditions, deadlocks, or complex thread interactions. In this tutorial, we show how to debug C++ and C programs in Visual Studio Code (VS Code) using UDB, a powerful plugin that enables reverse debugging and deep inspection of concurrent code.

Whether you’re a software engineer, backend developer, or just learning C/C++ programming, this video walks through the real-world process of diagnosing and resolving multithreading issues like mutex misuse, data races, and pthreads synchronization problems. We focus on systems programming and concurrency — critical skills for developing reliable and performant software.

You'll learn how to:
Use VS Code for debugging C/C++ applications
Analyze and fix threading issues and race conditions
Work with shared memory, mutexes, and pthreads
Apply reverse debugging techniques to step back through code
Understand debugging tools that support parallel programming

This tutorial uses the following dependencies:
Undo UDB - free trial available at https://undo.io/udb-free-trial/
The Visual Studio Code (VS Code) extension - available to download free from the VS Code marketplace https://marketplace.visualstudio.com/...

Ideal for:
C and C++ programmers
Developers using Visual Studio Code
Engineers working on multithreaded or concurrent applications
Students or professionals learning systems programming or backend development

Topics covered:
Debugging multithreaded applications
Race conditions in C++
Reverse debugging in VS Code
Pthreads and synchronization issues
Mutex and shared memory debugging
Using VS Code for C/C++ development
Concurrency bugs and how to fix them
Parallel programming and thread tracing

💡Don't yet know about thread fuzzing?
Thread fuzzing allows you to perturb the scheduling of threads to make it easier to expose race conditions.
Learn more at: https://undo.io/resources/thread-fuzz...

💡Technical paper:
Debugging Multithreaded Codebases at Scale: https://info.undo.io/debugging-multit...
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Chapters (Timecodes):

0:00 - Introduction to Debugging Multithreaded Code
0:02 - Why GDB Falls Short for Multithreaded Debugging
0:09 - Overview of Time Travel Debugging with UDB
0:20 - Setting Up the Debugging Environment in Visual Studio Code
0:44 - Installing and Configuring UDB Extension in VS Code
0:54 - Running the Code and Starting the Debugging Session
1:16 - Identifying the Crash and Navigating the Stack Trace
1:36 - Using Reverse Debugging to Track the Problem’s Source
2:04 - Analyzing Variables and Values with UDB
2:48 - Understanding Mutex Issues and Thread Synchronization
3:09 - Using Bookmarks to Track Important Points
3:32 - Leveraging the Last Change Button for Efficient Debugging
4:13 - Investigating Unsafe Thread Increments
4:41 - Using Info Timeline to Visualize Execution Flow
5:03 - Solving the Issue: Moving Thread Functions Under Mutex Lock
5:37 - Real-World Applications of Time Travel Debugging
5:59 - Introduction to Thread Fuzzing for Concurrency Bugs

For more information or to try out UDB for free on your own code, visit: https://undo.io

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