This is an important feature in a multithreaded environment, without a dedicated interrupt stack each thread has to reserve enough space, for interrupts servicing, within its own stack.

• 这在多线程的环境中是一个重要的特性，如果没有专用的中断堆栈，每个想成都必须在自身的堆栈中为中断服务程序预留足够的空间。