Crucial Exams

ISC2 Certified Secure Software Lifecycle Professional (CSSLP) Practice Question

Performance profiling shows a C++ microservice where thousands of threads mostly read a shared stdmap of customer balances, while updates are rare. A single stdmutex guards all accesses but throttles throughput. Which change best maintains correctness and reduces contention in this read-heavy scenario?

  • Remove the lock entirely and rely on CPU cache coherence to keep the map consistent across threads.

  • Replace the single mutex with a readers-writer (shared) lock so multiple threads can read concurrently but writers still lock exclusively.

  • Mark the shared std::map variable as volatile to ensure all threads observe the latest values without locking.

  • Guard accesses with a counting semaphore whose permit count equals the number of worker threads.

ISC2 Certified Secure Software Lifecycle Professional (CSSLP)
Secure Software Implementation
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