volatile int

I. macro definition: Mainly some Syntax problems and skills For example: # Define find (S, e) (size_t) & (struct s *) (0)-> E) // calculates the offset of the variable in the structure to the struct. # Define seconds_per_year (360*24*60*60) UL //

The volatile keyword is a type modifier that uses the type variables it declares to indicate that it can be changed by unknown factors of Some compilers, such as operating systems, hardware, or other threads. When the variable declared by this

#include #include #include #include #include #include #include #include #include #include #include / * After loading mode, execute "cat/proc/devices" command to see the device name */#define DEVICE_NAME "Key_poll"/ * Automatically create

The meaning of volatile is "volatile, easy to change". The meaning of this qualifier is to indicate to the compiler that the contents of a variable may change as a result of another program's modification. Usually when a variable is declared in a

function volatileFunction: As a directive keyword, ensure that this instruction is not omitted by the compiler optimization and requires a direct read value each time. To put it simply, prevent the compiler from optimizing the code. For example,

#include #include #include #include #include #include #include #include #include #include #if!defined (__attribute__) && (defined __cplusplus) | |!defined (__gnuc__) | | __gnuc__ = 2 && __gnuc_min or__ #define __ATTRIBUTE__ (A) #endif

#include #include #include #include #include #include #include #include #include #include #define Key_device_count1#define Key_device_name"Key"/*key character device structure body */struct Key_dev{struct CDEVCdev;unsigned

WusiDeep understanding of the function call stackA stack is a space that the C language program must run with a record call path and parametersThe role of the stack Function call Framework Passing parameters Save return address

1, the difference between process and thread, and comparison of pros and consThe main difference between processes and threads is that they are different ways to manage operating system resources. The process has a separate address space, and after

Const and volatile in C language and constvolatile Baidu was abused by volatile during the interview, which is also used in many places in the kernel. The probability of this interview is too high, so some results have been collected for your

Lkm-Based System Call hijacking in linux2.4.18 Kernel Linux is now used more and more, so the security issues of Linux are gradually becoming more and more people's attention. Rootkit is a tool set used by attackers to hide traces and retain root

From: http://blog.csdn.net/linweig/article/details/5060143 C language testing is an essential and effective way to recruit embedded system programmers. Over the years, I have participated in and organized many such tests, during which I realized

C language testing is {Function onclick (){Tagshow (Event)}} "> Recruitment {Function onclick (){Tagshow (Event)}} "> Embedded {Function onclick (){Tagshow (Event)}} "> System {Function onclick (){Tagshow (Event)}} "> It is a required and effective

C language testing is an essential and effective way to recruit embedded system programmers. Over the years, I have both participated in and organized many such tests. During this process, I realized that these tests can provide a lot of useful

Embedded programmer C Language Test typical questions This is an article by Daniel. It is estimated that the author is a project manager for embedded software development, who organizes some common written examinations, interview questions, and some

1.Pointer Parameters Void F (char * P) { P = (char *) malloc (10 ); } IntMain () { Char * P = NULL; F (p ); Free (P ); Return0; } Free (null) is acceptable, but the pointer variable for function parameters is still one-way value transfer, and the P

C language testing is an essential and effective way to recruit embedded system programmers. Over the years, I have both participated in and organized many such tests. During this process, I realized that these tests can provide a lot of useful

A variable defined as volatile means that this variable may be unexpectedly changed, so that the compiler will not assume the value of this variable. Precisely, the optimizer must carefully re-read the value of this variable (from memory) every time

Source: Network 0x10 basic issues that embedded programmers should know 1. Use the preprocessing command # define to declare a constant to indicate the number of seconds in a year (ignore the leap year problem)# Define seconds_per_year (60*60*24*365)

C Language Testing: 0x10 basic issues that embedded programmers should know 11:18:53 from: http://www.chinaunix.net   C language testing is an essential and effective way to recruit embedded system