Quant Interview Practice Questions

In quantitative trading systems, worker threads frequently poll concurrent queues to process high-throughput market data or order updates. Implementing cooperative cancellation ensures that these threads can unblock and exit cleanly during system shutdown without data corruption or busy-waiting. Task Implement a CancellableQueue class that provides thread-safe access and supports cooperative cancellation. Your class must implement the following methods:

• void push(double val): Adds val to the