6.5 Concurrency & Deadlock

(Difficulty Note: This section is the most abstract and difficult for a 7th-grade audience. The focus will be on the problem of "deadlock" with very simple analogies rather than technical solutions.)

Concurrency means having multiple tasks (processes or threads) running seemingly at the same time. Modern computers are amazing because they can do many things "at once" – you can browse the web, listen to music, and download a file all at the same time. The OS makes this possible by rapidly switching between tasks.

But sometimes, when multiple tasks try to share limited resources, they can get stuck in a tricky situation called deadlock.