500+ quant interview questions for Jane Street, Citadel, Two Sigma, DE Shaw, and other top quantitative finance firms.
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Difficulty: Hard
Category: low_latency
Practice quant interview questions from top firms including Jane Street, Citadel, Two Sigma, DE Shaw, and other leading quantitative finance companies.
Topics: lfence, spectre, memory-fence, low_latency, speculative-execution, x86
In low-latency trading, market data feeds are processed in tight loops where each packet is validated by a sequence number. A CPU's speculative execution engine can bypass this check, creating a Spectre-class vulnerability that leaks data through side-channels. To mitigate this, a memory fence instruction like lfence is used to serialize execution, ensuring a security check fully resolves before any subsequent sensitive data is accessed. Task Implement the function read_guarded(int seq_expected
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