linux finite element analysis

construct.However, if you changeClass a{public : A () : I (1) { } A (const A a) { } int i; int i1; int i2;}; A func () { a A; return A;} void Func1 () { A B = func ();}　　Compilation can pass, why. Because the const a is passed in means that the object constructed with this value does not modify the value. Or can not be modified. Therefore, you can use this value to construct other objects.But the problem is still a, a is no longer on the stack, how to

Linux kernel initializes the process of high-end memory The kernel calls Mem_init () in the Start_kernel () function to do all the work related to memory initialization. The work associated with initializing high-end memory is done in function set_highmem_pages_init (). Here's a detailed analysis of the process. 109 void __init set_highmem_pages_init (void) 110 { struct zone *zone; 112 int nid; 113 114 For

Strace is a powerful Linux debug Analysis Diagnostic tool that can be used to track process system calls and received signals during program execution, especially for programs that are unreadable by the source code or are not compiled by source code.In a Linux system, the user program runs in a sandbox, and the user process does not have direct access to the comp

related books are introduced, such as the reference to pointers in the various object models in the deep exploration of the C + + object model, and the function pointers in the polymorphic implementation process. Is the idea of such transparency.and the variable storage method of knowledge is very much in the book to be involved in the "deep understanding of computer systems," the book is very specific.Interested cheese can go and have a look. Finally, personal ability is limited, there are fra

. A file can have multiple virtual addresses (identified by multiple vm_area_struct) but can have only one physical address (address_space data structure). Each Address_space object has a unique base tree. Motoki is a binary tree that can quickly retrieve the desired data in the base tree as long as the file offset is specified. This data is called dirty data when the page cache data is newer than the data stored in the background. Writeback in the

List_head *pos; Define a node pointerstruct score *tmp; Define a score struct variableTraversing the entire list, each iteration prints out the data List_for_each (POS, score_head)//The POS here will automatically be assigned a new value {tmp = List_entry (pos, struct score, list); PRINTK (kern_warning "num:%d, 中文版:%d, Math:%d\n", Tmp->num, Tmp->english, Tmp->math);}List_for_each_safe: Release of linked list/** * List_for_each_safe-iterate over a list safe against removal for list entry * @pos:

list /** * List_add_tail-add A new entry * @new: New entry to is added * @head: List head to add it before * * Insert A new entry before the specified head. * This is useful for implementing queues. * /static inline void List_add_tail (struct list_head *new, struct list_head *head) { __list_add (new, head- Gt;prev, head); Usage examples: struct SCORE{int num;int 中文版;int math;struct List_head list;//chain table Access field};struct List_head score_head;//Linked list headerDe

. The array element type is prio_array_t.struct Prio_array {int nr_active; //number of processes struct List_head Queue[maxprio];unsigned long bitmap[bitmap_size];}When the time slice of a normal process is exhausted, its priority and time slice are recalculated, and it is first removed from the active array (the active process collection) and added to the corresponding priority queue in the expired array (the expired process collection)Iv. My views

Originally wanted to write an article about Anaconda, but see here to write so detailed, turn, the original text here: Linux Installer Anaconda Analysis (cont.) (1) disptach.py: Let's take a look at the main interface of the dispatcher class.1 GoToNext Gotoprev: These two interfaces move forward (backwards) from the current installation step (back) to the next (previous) with the user interface installati

\vVersion of Bash\vBash release number, version number plus patch level\wCurrent working directory\wBasic parts of the current working directory\!The history number of this command\#Command number for this command\$If the valid UID is 0, that is #, the other case is $\nnnCharacter corresponding to octal number nnn\\A back slash\[The beginning of a non-printable sequence of characters that can be used to embed the terminal control sequence at the prompt\]End of a non-printable character sequenceT

redirect error is generated. If Word expands to "-", the file descriptor n is closed. If n is not specified, standard input (file descriptor 0) is used.[N]>wordThis operator is also used to copy output file descriptors. If n is not specified, standard output (file descriptor 1) is used. If a number in Word does not specify a file descriptor to be used for output, a redirect error is generated. In special cases, if n is skipped, and word is not expanded to one or more numbers, standard output an