metric clock

Clock interruption mechanism of Linux operating system kernel-Linux general technology-Linux programming and kernel information. The following is a detailed description. Abstract: This article mainly analyzes the clock interruption and Kernel Time Representation of Linux 2.4.0 kernel from the perspective of kernel implementation. This article is intended for readers and Linux driver developers who want to

S3C2410 has three clock flck, hclk, and pclk (these three are the core hour hands) The S3C2410 chip has such a paragraph: Fclk is used by ARM920T, kernel clock, clock speed. Hclk is used for AHB Bus, which is used by the ARM920T, the memory controller, the interrupt controller, the LCD controller, the DMA and USB Host block. that is, it provides

# Include # Include Using namespace STD;Int main (){Time_t begin, end;Begin = clock ();// Add your code hereEnd = clock ();Cout } UNIX time-related and standard libraryIn 1. The timegm function only converts the struct TM structure to the time_t structure without the time zone information;Time_t timegm (struct TM * TM ); 2. mktime uses time zone informationTime_t mktime (struct TM * TM ); The timelocal fun

Start a new year ~ K60 has been cool in my hand for many days. I haven't finished it for a long time. Today, I 've played it like a baby. It's a little bit of a success. I 'd like to share it with you, because it is only a small skill, it is not included in the series from scratch. In fact, I used to pay attention to this when I started the code. But I didn't try it myself at that time. I always felt that there was no theory, but I didn't know how to do it. As a matter of fact, many people have

#ifndef __sys_h_#define __sys_h_#include "Common.h"#define SYSTEMCORECLOCK 120000000//cpu clock frequency, useful when calculating#define Apbclock 120000000//120m#define Emcclock 60000000//60m#define Usbclock 48000000//48mvoid Systeminit(void); System clock initialization, start code call#endif#include "Sys.h"#define XTAL_FREQ 12000000#define LPC_PBOOST * (volatile unsigned long *) (0X400FC1B0)void Systemin

Original link: Quora translation: Jay Weibo-SophyLink: Http://www.jointforce.com/jfperiodical/news/show/321?m=d03 can also earn money on the Jointforce platform package ~The CPU clock frequency has not increased in the last 5 years is caused by many different categories of reasons.First, the PowerThe graph is the relationship between the clock frequency and the power consumptionWhen designing a CPU's microa

Windows has an alarm clock application starting at 8, and becomes a modern app (modern application) in build 9926 and can be used on the desktop. In the provision of alarm clock function, there are world time, timer, stopwatch and other functions. 1, start the alarm clock. 　　Method One: "Start" button--> "all apps"--> navigate to "Letter N"--click "Alarm

First, the difference between NTPD and ntpdate:Excerpt from: The difference between ntpd and ntpdate-baccarat-Blog Park http://www.cnblogs.com/liuyou/archive/2012/07/29/2614330.html1. Difference: NTPD is the time to adjust, Calibration of the time 1.1 points, and finally the time to correct the right; Ntpdate is the calibration time, that is, the direct adjustment time, does not consider other programs, the direct result is the clock jump.　 　2. Conseq

1, Introduction① How do you define the order in which all events in the system are occurring in a distributed environment? ② How are multiple processes competing for resources in a distributed environment mutually exclusive? ③ What is partial order, what is the role of partial order, what is insufficient? ④ what is the whole order, what is the role of the whole order, what is the shortage? ⑤ Why do I need a physical clock and how is the physical

The Android setting alarm clock is not as simple as iOS, and developers who have made the Android alarm clock know how deep the hole is. Here's a note of my solution to the Android alarm set.Major problems1, API19 began to alarmmanager mechanism changes.2, the application is killed, set the alarm clock does not ring.3, more than 6.0 into the doze mode will make J

Label: strong on, and set the CPU microcontroller to synchronize trWhat clock?First, let's talk about what a clock is. The clock is the heart of the microcontroller. Every beat. All the circuits of the single-chip microcomputer are synchronized. It's like when we were doing broadcast gymnastics, the beat We shouted on the broadcast was 1234, 2234, 3234 .... Then,

1. clock speed The clock speed is also called the clock frequency. The unit is MHz (or GHz), which is used to indicate the speed at which CPU operations and data processing are performed. CPU clock speed = frequency X frequency doubling coefficient. Many people think that the cloc