堆栈是一个后进先出(LIFO)队列，它保存了子例程的返回地址、数据项、指针等等。

The stack is a last-in-first-out (LIFO) queue that holds subroutine return addresses, items of data, Pointers, and so on.

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在Linux kernel中，所有的进程都是用双链表表示的，双链表带的数据是task_struct . kernel保存一个current指针，指向当前系统中执行的进程。

Within the Linux kernel, all active processes are represented using a doubly linked list of task_struct. The kernel maintains a pointer-current-to the process currently executing on the system.

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