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Concurrency

Multiple tasks in progress during overlapping time periods, sharing resources like threads, memory, and connection pools. Contention for those shared resources — not CPU arithmetic — is what usually exhausts a service under load.

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Concurrency Patterns in Low-Level System Design Interviews

Concurrency problems in multi-threaded systems fall into three fundamental categories: correctness (shared state corrupted by concurrent access, via the check-then-act and read-modify-write patterns)…