SelectWhat's included
The problem is that this solution doesn’t generalize. For instance, imagine we now also want to filter by country:
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正确做法： 用 java.util.concurrent.locks.ReentrantLock 代替 synchronized，因为 Lock 的等待可以被 JVM 处理为可卸载。
When that happens, the runtime allocates a new, larger stack (typically double the size), copies the old stack contents over, adjusts all the pointers that reference stack addresses, and frees the old stack. The goroutine then continues running on its new, bigger stack as if nothing happened. This is what allows Go to run millions of goroutines — they start small and only grow when they actually need the space.
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