present clock time

First, prefaceClock is the basis of a timer, and any timer needs to work on a given clock. The kernel maintains a number of clock, the second chapter of this article describes the basic concept of clock and some statically defined POSIX clock.

Original Address http://www.dzsc.com/data/html/2011-1-17/88338.html1 IntroductionIn distributed systems, a global time is often needed to determine the sequence of events in the system, to coordinate the transmission of various messages, and to

Http://blog.sina.com.cn/s/blog_68f909c30100pli7.htmlReal-time Clock: RTC Clock, which provides real time information for years, months, days, hours, minutes, seconds, and weeks, powered by a back-up battery, and RTC still maintains the correct time

The arm arch in kernel-2.6.22 has added support for dynticks, clocksource/event. We have found some recent changes to the kernel clock and timer subsystems.Generally, soft-timer (timer wheel/hrtimer) is composed of hardware-timer (such as clock

1. In stm32, there are five clock sources:HSI,HSE,LSI,LSE,PLL. ①HSIIt is a high-speed internal clock, RC oscillator, and the frequency is 8 MHz. ②HSEIt is a high-speed external clock, which can be connected to a Z/Ceramic Resonator or an external

Amazon's Dynamo [9] and Facebook's Cassandra [], relax the consistency Model,and offer only eventual consistency. Others such as HBase [1] and BigTable [4] offer strong consistency only for operations touching a single partition, but no T across the

1. There are two types of clocks under Linux:1.1 Real Clock RTCThe "Real Time Clock", which is powered by the onboard battery, is also called the RTC or the CMOS clock, the hardware clock. When the operating system shuts down, use this to record the

Bit: in a binary system, each 0 or 1 is a bit, which is the minimum unit of memory. Word Length: in computer technology, the number of digits of the binary number that the CPU can process at a time in a unit of time (at the same time) is called

Http://blog.sina.com.cn/s/blog_630630870100l340.html Abstract: This paper introduces the working principle of high-precision analog-to-digital converter ad7671, and describes the implementation method of high-speed and high-precision data collection

The first two sections of this series discuss clock sources for timing: clocksource and some representation of kernel internal time, but for real users, we perceive the real time of the real world, that is, the so-called wall time. clocksource can