Your own details, each highlighted inside the course: Link to the engineering standards or style guide, Where completion is recorded, Who to ask for help or to report a concern, Link to the self-paced course. Then edit anything else you like: wording, scenarios, your logo.

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Concurrency safety: Threads, locks and race conditions

A ready-made course, live deck and two surveys for back-end developers and systems engineers. AhaSlides tracks progress, completion and scores for you. 40 minutes, 6 lessons. Last reviewed 21 October 2026; not legal advice.

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Course outline at a glance

The bug
What went wrong

Timeline
Quiz

Compare
Which model?

Sorting activity
Flashcards
Matching quiz

Tools
Pick the tool

Tabs
Scenario
Quiz
Multi-select quiz

Deadlock
Break it

Timeline
Scenario
Quiz

Patterns

Accordion
Quiz

Review checklist

Checklist
Quiz

Try some questions from the course

Question 1 of 3

What was the root cause of the short total?

Two workers changed shared state without protection.

Lesson 1, A counter that was wrong every tenth run, teaches this. See the outline

Question 2 of 3

What does a mutex guarantee?

A mutex gives one owner at a time.

Lesson 3, Locks, mutexes and semaphores, teaches this. See the outline

Question 3 of 3

What is the usual way to prevent this kind of deadlock?

A fixed order stops a circular wait.

Lesson 4, Race conditions and deadlock, teaches this. See the outline

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Learners earn a certificate

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Alex Morgan

has completed

Concurrency safety: Threads, locks and race conditions

Completed on12 October 2026

Sample certificate with a placeholder learner name.

Style 1 of 6: Slate mono

Everyone who finishes gets a certificate with their name, the course title and the completion date. Add your own logo, colours and signer.

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The Concurrency safety: Threads, locks and race conditions course as a learner first sees it

Who has finished
See who has not started, who is in progress and who has completed the course.
Every score
Each learner's answers to the quizzes and activities in the course.
What landed
Survey results show what people took away, and the 30-day check-in shows whether they use it.

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Lesson 1: A counter that was wrong every tenth run · 8 min
Before you begin · The bug · What went wrong
Lesson 2: Threads, processes and async · 8 min
Compare · Which model? · Check
Lesson 3: Locks, mutexes and semaphores · 8 min
Tools · Pick the tool · Check
Lesson 4: Race conditions and deadlock · 6 min
Deadlock · Break it
Lesson 5: Concurrency patterns by language · 5 min
Patterns · Check
Lesson 6: Reviewing concurrent code and final assessment · 5 min
Review checklist · Practice

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Common questions

Yes. The course, the live deck and both surveys are free. Claiming the template into your AhaSlides account is free too.

Yes. The course is self-paced and online, and the live deck lets you add a live session in the room or online.

At onboarding of back-end engineers, and after a race-condition incident.

Back-end developers and systems engineers; run by senior engineers and engineering managers with L&D.

Record completion in your own LMS or record system, so you can show who finished the course and when.

Yes, everything. Change the wording, swap scenarios for ones from your workplace, add your logo, or remove parts that don't apply.

Your own details, each highlighted inside the course:

Link to the engineering standards or style guide
Where completion is recorded
Who to ask for help or to report a concern
Link to the self-paced course

Then edit anything else you like: wording, scenarios, your logo.

Visit the help centre (opens in a new tab)

Concurrency safety: Threads, locks and race conditions

Course outline at a glance