Race Condition
ELI5 — The Vibe Check
A race condition is when two parts of your code are racing to do something at the same time and the winner isn't guaranteed — leading to unexpected, hard-to-reproduce bugs. It's like two people editing the same Google Doc simultaneously and overwriting each other.
Real Talk
A race condition occurs when a system's correctness depends on the relative timing of concurrent operations. Multiple threads or processes accessing and modifying shared state without proper synchronisation can lead to data corruption or unpredictable behaviour.
When You'll Hear This
"That bug only happens under load — classic race condition." / "Use a mutex to prevent the race condition on the shared counter."
Related Terms
Async
Async means 'don't wait around'. You order food at a restaurant, then chat with friends instead of standing at the kitchen window staring.
Concurrency
Concurrency is juggling multiple tasks at once — not necessarily at the exact same instant, but switching between them fast enough that they all seem to be...
Deadlock
A deadlock is when two things are each waiting for the other to go first, and neither ever does. Thread A holds Lock 1 and wants Lock 2.
Idempotent
Idempotent means you can do the same thing multiple times and get the same result as doing it once.
Thread
A thread is a mini-worker inside your program that can run tasks independently.