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What am I guarding? is a cooked quant interview question on concurrency.
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This question tests your grasp of RAII-based synchronization primitives in C++—a core concept for anyone writing low-latency or safety-critical multithreaded code. It's the kind of foundational question that trading firms and systems teams ask to verify you understand not just *what* a lock does, but *how* modern C++ ensures locks are used safely.
The question probes whether you recognize the pattern of acquiring a resource (a mutex) at the point of object construction and releasing it at destruction—and why this pattern matters for correctness. Strong answers demonstrate awareness of scope-based guarantees, exception safety, and the difference between manual locking and automatic lock management.