I think every programmer knows the linked list very well. The structure is like a chain, one by one, and the access to it is a bit like a sugar gourd. If you want to eat the second one, you must first eat the first one. This is a one-way linked list. Of course, it also has more advanced features, such as cyclic linked list, bidirectional linked
Data doubly linked list of Linux kernels
Guide
The Linux kernel itself implements a doubly linked list, which can be found in include/linux/list.h. We will begin by introducing the data structure in the kernel from a doubly linked
Use the Linux kernel linked list, hlist macro definition, and operations in user space programming.
List_head and hlist_head/hlist_node in Linux kernel are two important linked list construction tools that concatenate data structures into linked lists. Using their corresponding macro definition, you can easily constru
On the realization of the double linked list, the general textbook defines a two-way linked list node in the following ways:
Copy Code code as follows:
struct list_node{
Stuct List_node *pre;
Stuct List_node *next;
Elemtype data;
}
That is, a list node contains: A pointer to a forward node, a pointer to a subsequent node, and a total
Linux Kernel linked list Transplantation
I have modified the two-way linked list and hash linked list of the transplanted Linux kernel by referring to the online article, so that it applies to Linux and Windows platforms. It can
An in-depth analysis of the Linux operating system kernel linked list-general Linux technology-Linux programming and kernel information. The following is a detailed description.
I. Data Structure of linked lists
A linked list is a commonly used data structure for organizin
internal implementation of the function, learn to check the parameters of these functions or the best way to implement the code or directly to see the kernel source, the knot and the front of the Sourceinsight tool directly search for the names of these functions)Here's an example: for example , check the Init_list_head function,This is the first to import the kernel source code sourceinsight project inside! The source code can be downloaded on the official website, then unzipped under
parameters of these functions and the internal implementation of the function, learn to check the parameters of these functions or implement the code the best way to directly view the kernel source, knot and the previous use of the Sourceinsight tool directly search the names of these functions)
Here's an example: Check the Init_list_head function,
This is to first the kernel source code into the Sourceinsight project inside. Source code can be downloaded on the official web, and then unzipp
1. Ordinary single-linked list2. Kernel link ListI was stolen from other blogs, almost fooled past.I use keynote to draw it myself (alas!!) Drawing really is to let the human heart is very tired ah!! )。The difference is not very obvious ah?!Read the fucking Source Code1. Initialization/*Include/linux/types.h*/structList_head {structList_head *next, *prev;};/* include/linux/list.h *//*xxxxxxxxxxxxxxxxxxxxxxx
There are a number of linked lists used in the Linux kernel: doubly linked lists. The management of the processes used in the kernel is achieved through a doubly linked list. So the operation of the list is very common and very important, so the kernel by providing a common method to help us to facilitate the implementation of the double-linked
definition of the Linux kernel list (defines a doubly linked list, without data fields)defined in the/linux-source-3.13.0/include/linux/types.h header file.1 struct List_head {2 struct list_head *next, *prev; 3 };We can use this data structure to define linked lists
OneThe Linux kernel list is a two-way loop linked list, similar to the linked list in the data structure, no longer detailed. Because the functions implemented in the kernel are classic, porting them is convenient for use in later applications./*********************************** file name: Kernel link
place them in the/var/Cache/Yum Directory, which may take a long time.
Linux Yum package update
Check the updatable RPM package# Yum check-Update update all RPM packages# Yum Update the specified RPM package, such as updating the kernel and kernel source# Yum update kernel-source large-scale version upgrade. Unlike Yum update, the old obsolete package is also upgraded.# Yum upgradeInstallation and deletion of RPM packagesInstall RPM packages like xmm
Recently looking at the code of the Linux kernel, the first to know is the data structure used internally by Linux: Linked list.In fact, the list of links used by the Linux kernel is a two-way circular list. Like a regular linked list
Use Linux kernel list-general Linux technology-Linux programming and kernel information in your program. The following is a detailed description. In our daily programs, we often encounter writing linked lists. For c ++ programs, stl provides two templates: list and vector, w
Linux kernel link list:A linked list typically consists of two fields: a data field and a pointer field.struct list_head{struct List_head *next,*prev;};A wonderful set of linked list data structures is implemented in include/linux/list.h.The traditional linked list pointer p
request memory will not occur.?? List_empty: Checks if the linked list is empty.?? List_for_each_entry: Iterates through the list and gets the pointer to the outer struct by List_entry.use of the kernel chain list?? First define the structure, the data for CH and grade,ch save the student's name, Grade Save the student's performance.?? Then define one, two, thre
is in use.If the above two steps are not return then it is necessary to the PID bitmap in the PID representation of the 0, for the system to use.An understanding of the above code is prone to problems:
(tmp = Pidtype_max;--tmp >= 0;)
201 if (tmp! = Type find_pid (tmp, NR))
202 return;
Why only search other types of hash lists without processing the hash list of the type of PID we just deleted? Because the hash
Basic concepts
1. A linked list is a commonly used data structure that passes through pointers
Connect a series of data nodes into a single data chain.
Phase
For the array, the linked list has a better dynamic nature, and establishes
Linked list without prior knowledge of the total amount of data, you can randomly
Allocate space that can be efficiently in any bit
ACL File Access Control List in Linux
In Linux, objects that can be operated on a file (or resource) are divided into three types: file owner (file owner), group (group, it may not be the group where the file owner is located. other (Others) defines the read, write, execute (read, write and execute) permissions and special permissions for each category. However,
The content source of this page is from Internet, which doesn't represent Alibaba Cloud's opinion;
products and services mentioned on that page don't have any relationship with Alibaba Cloud. If the
content of the page makes you feel confusing, please write us an email, we will handle the problem
within 5 days after receiving your email.
If you find any instances of plagiarism from the community, please send an email to:
info-contact@alibabacloud.com
and provide relevant evidence. A staff member will contact you within 5 working days.