feat: stabilize shop simulation and add CI demo#1
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Validate parsed argument values and allocate child PID storage based on the final customer and sales agent counts.
Store reader and waiting-writer counters in shared memory. Use blocking System V semaphore operations, initialize semaphore values explicitly, and allow child processes to finish active operations before terminating.
Use a turnstile-based locking scheme with shared reader state and blocking System V semaphores. Revalidate concurrent order updates and support graceful shutdown for child and manager processes.
Remove unused waiting-writer counters, writer semaphores, and obsolete request parameters after adopting the turnstile-based readers-writers scheme.
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Summary
This pull request turns the original Shop Simulator into a reliable, runnable concurrency demo.
Changes
Validation
-Wall,-Wextra,-Wpedantic, and-Werror;Ctrl+C;