gettimeofday

Reproduced in: http://blog.chinaunix.net/uid-25909722-id-2827364.html architecture and related functions representing "Time" in Linux 2011-09-13 17:01:13Category: C/In the Linux system, there are many structures representing the concept of "time",

System Environment: ubuntu10.041. Common time types under Linuxtime_t, struct TM, struct timeval, struct TIMESPEC1.1 time_t Time TypeThe time_t type is defined in Time.h:typedef long time_t;Visible, time_t is actually a long integer type. Its value

Test code run time in Linux has a function to get the current time, accurate to microseconds----> gettimeofday ()1#include       // int gettimeofday (struct timeval *tv, struct timezone *tz);2 /*********************************************3 *

Test code run time in Linux has a function to get the current time, accurate to microseconds----> gettimeofday ()1#include       // int gettimeofday (struct timeval *tv, struct timezone *tz);2 /*********************************************3 *

Listen to people say gettimeofday in 64bit cache, fast, test under, feel wrong ah.#include #include#include#includeintFoointi) { returni;}Constint64_t Max_count =100000* +;structtimereval {timereval (Const Char*module) {Start_time_=Time (NULL);

3.3.1. About the concept of time 3.3.1.1, GMT (1) GMT is Greenwich Mean Time, which is the local area of Greenwich. (2) What is the meaning of GMT time? "Use Greenwich local time as global international time" to describe the time of global events,

Linux time zone details and common time functions time and time zone The entire earth is divided into 24 time zones, each time zone has its own local time. ø  UTC Time and GMT time We can think of Greenwich Mean Time (GMT = UTC), GMT and

First, prefaceFrom an application perspective, there are three types of time-related services that the kernel needs to provide:1, and system time-related services. For example, when you write a record to a database, you need to record the operation

Related functions: time, ctime, gmtime, localtime // Certificate //--------------------------------------------------------------------------------------------------------------------------------------------------------// Asctime (represents the

From http://blog.csdn.net/outblue/archive/2010/02/04/5288760.aspx Dashboard January 2007 issueMehul PatelUsing uinput driver in Linux-2.6.x to send user input Dashboard January 2007 issueUsing uinput driver in Linux-2.6.x to send

In the previous Linux x86_64 process memory space layout, we talked about the macro distribution of memory space under two different parameters in the process running. Perhaps you will notice such a detail, in each process of the stack above the

Volatile reminds the compiler that the variables defined later can change at any time, so the compiled program will read the data directly from the variable address each time it needs to store or read the variable. If there is no volatile keyword,

Commondef.h Copy Code code as follows: Unit seconds, monitoring the idle list time interval, the task that exceeds Task_destroy_interval time in the idle queue will be automatically destroyed const int check_idle_task_interval = 30

This article describes some of the timing-related problems and solutions in the Linux system. Because in the course of study and research, we often need to count the time of program or program, evaluate their performance. So these problems are often

Reprint please explain source: http://blog.csdn.net/cywosp/article/details/25839551 In the process of time processing is often a problem, the Linux system provides a lot of time processing functions, we can use these functions to complete the

Linux Operating System Computing time:Main function: Time localtime gmtime asctime ctime mktimeDifftime strftime Gmstrftime1.time () functionPrototype: time_t time (time_t * timer)Function: Returns a time_t type of data representing the number of

The importance of volatile is self-evident for Embedded programmers, the understanding of volatile is often used by many companies as a reference to measuring whether a candidate is qualified when recruiting embedded programmers. Why is volatile so

Use C language for timing In user space, you can use the C language function gettimeofday to get the time. The call format is: # Include Int gettimeofday (struct timeval * TV, struct timezone * tz );Int settimeofday (const struct timeval * TV,

Asctime (represents the time and date in string format) #include Define functions char * asctime(const struct tm * timeptr); Function Description Asctime () converts the information in the TM structure referred to by the timeptr parameter to the

ACE_ OS: strcasecmp case-sensitive comparisonACE_ OS: strncasecmp n-character case comparisonACE: execname (prog1); execute the prog1 ProgramACE_ OS _String: strdup string deep copyACE_ OS: uname (& uname); get operating system