If the lock was granted, the lock function returns to the caller.

如果授予了锁，那么lock函数返回调用者。

youdao

The calling function must not depend on the parameter list still being on the stack when your function returns to it.

当函数返回到进行调用的函数时，后者一定不能依赖于仍在栈中的参数列表。

youdao

Proceed to call the key-unsafe function, with the link register set, so that the called function returns to the next step below.

继续调用键不安全的函数，使用所设置的连接寄存器，以便被调用的函数返回下面的下一个步骤。

youdao

And then as soon as the function returns, you kinda have to unwind but remember where you were just a moment ago.

一旦函数返回,你必须记得之前在哪个位置。

哈佛公开课 - 计算机科学课程节选

Only the operating system has controlling of byte zero NULL in the computer's RAM and so if a function ever returns null, aka zero, well, something must have gone wrong because that can't possibly belong to me that memory because by human convention zero is owned by the operating system; not by a program I wrote.

只用操作系统在内存中能够控制,字节0，并且如果一个函数返回，或者说0，好的，可能出错了,因为那可能是不属于我的内存,因为惯例上，0是由操作系统拥有的,而不是由我的程序拥有的。

哈佛公开课 - 计算机科学课程节选