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Thread safety and deadlocks, explained and demonstrated

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MicrosoftCodingLast asked Aug 2026

A fast concepts round. What makes code thread-safe? Show the common ways a deadlock happens (for example two threads taking two locks in opposite order) and the ways to prevent each: lock ordering, timeouts, fewer locks. Some interviewers ask you to write a deadlock on purpose and then fix it. Short follow-ups compare arrays and linked lists for access, insertion and memory.

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