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View Code? Open in Web Editor NEWOSTEP-操作系统导论 答案 Operating Systems: Three Easy Pieces
OSTEP-操作系统导论 答案 Operating Systems: Three Easy Pieces
如果你也想拥有这样的个人简介,可以参考: 如何在GitHub展示个人简介
你好,我想问问在习题中出现的这段代码:
sub $1, %bx
test $0, %bx
jgt .top
其中的test指令的作用是什么,我感觉作者想表达的应该是cmp指令,即和0进行比较,比0大就继续循环。
但是根据我对test指令的了解,它是对两个参数进行与运算,可是任何数和0相与不都是0吗,这样对条件码的影响会和cmp相同吗?
我看到你的答案里好像也是按照cmp理解的,所以我有些困惑,是我对test指令理解错了吗?
在书中,题目的要求是
creates a pointer to an integer, sets it to NULL, and then tries to dereference it
,也就是创建一个指向NULL的指针并且dereference它。根据C++ Dereferencing中的解释,dereference就是取值的意思,所以题目的要求应该是尝试访问这个指针,因此代码应该类似于:
int *p = NULL;
int i = *p;
而非在创建指针后将其free。
第1个job,响应时间:0
第2个job,响应时间:1x量子长度
第3个job,响应时间:2x量子长度
...
第N个job,响应时间:(N-1)x量子长度
avg响应时间 = [0+1+2+...+(N-1)]x量子长度 = (N-1)/2 x 量子长度
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