keynote timer

Transferred from: http://www.cnblogs.com/hoys/archive/2011/11/14/2248586.htmlTimers are a necessary part of all operating systems and you will find multiple timer mechanisms. We'll start with a brief introduction to some of the Linux timer patterns, and then delve deeper into how they work.The origin of the (Linux) timeIn the Linux kernel, time is measured by a jiffies global variable called, which identifi

Linux Kernel Timer I. Definition /Include/Linux/Timer. h struct timer_list {struct list_head entry;unsigned long expires;void (*function)(unsigned long);unsigned long data;struct tvec_t_base_s *base;#ifdef CONFIG_TIMER_STATSvoid *start_site;char start_comm[16];int start_pid;#endif};Ii. Functions An instance of the timer_list struct corresponds to a timer. in Linu

From: http://blog.163.com/hong_nt/blog/static/10468917120081130103632925/ The main function of the software timer is to implement the timeout mechanism of the state machine and implement the timeout-based counting function.Because the Protocol state machine runs on the Linux kernel, that is, it runs on the user State. InIn Linux, user-Mode Applications can only call three Timers: itimer_real, itimer_virtual, and itimer_prof. In the Protocol state mac

kernel timer (2.6.23) First, the definition:/include/linux/timer.h struct Timer_list {struct List_head entry;unsigned long expires;void (*function) (unsigned long);unsigned long data;struct tvec_t_base_s *base;#ifdef Config_timer_s

The purpose of using a timer is to perform a task periodically, or to perform a task at a specified time. In order to achieve this goal, there are generally two common and more effective methods. One is using the three timer inside Linux, and the other is sleeping or usleep the process to sleep for a while; in fact, there is another way, it is to use Gettimeofday, difftime and so on themselves to calculate

TIMERFD is a timer interface provided by Linux for the user program. This interface is based on file descriptors, and can be used for select/poll scenarios by using the file descriptor's readable event for timeout notification.One, related operation function#include int timerfd_create (int clockid, int flags);int timerfd_settime (int FD, int flags, const struct ITIMERSPEC * new_value, struct itimerspec *old_value);int timerfd_gettime (int fd,

I've been looking at some of the JavaScript principles, and I happen to see an analysis of the author of jquery about the principle of the JavaScript timer, so I decided to translate the original into Chinese, to share with you, and secondly, to deepen your understanding of JavaScript. Original link: http://ejohn.org/blog/how-javascript-timers-work/Original translation:At the basic level, it is important to understand how JavaScript timers work. Becau

This article summarizes the source from the chicken peck rice, thanks to the chicken peck rice. Source: http://www.jizhuomi.com/software/232.htmlTimer INTRODUCTIONTimers that can help developers or users complete a task on a regular basis. When using the timer, we can pass the time interval data to the system, then the system will trigger the timer handler after each time interval, and realize the periodic

From:http://doc3.workerman.net/worker-development/add.htmlAdd$time_interval, callable $callback [,$args = array(), bool $persistent = true])Perform a function or class method on a timed basisParameterstime_intervalHow long it takes to execute, in seconds, with decimals, and accurate to 0.001, that is, to the millisecond level.callbackcallback function注意：如果回调函数是类的方法，则方法必须是public属性argsThe parameters of the callback function must be an array, the element of which is the parameter valuepersistentIf

I. Create a timer object T = timerT = timer('PropertyName1', PropertyValue1, 'PropertyName2', PropertyValue2,...) Parameters in brackets can be provided when timer is created, or you can set and read through the set/get command later. Ii. Timer attribute Parameters 1. attribute settings(1) assign values directly during

1. Introduction to mac802_11 timer related classes The class diagram is as follows: Http://120.img.pp.sohu.com/images/blog/2007/12/3/16/16/1173b4c9ccf.jpg Figure 1 mac802_11 timer-related class structure in NS2. PS: In ~ NS \ common \ timer-handler. [h, CC] defines a timerhandler class, which is a general timer in NS.

the soft interrupts for all registrations under kernel. struct softirq_action{void (*action) (struct softirq_action *);}; The array subscript represents the soft interrupt number, and the softirq_action represents the soft interrupt handler function. The Softirq_vec is similar to irq_desc that characterize hardware interrupts under kernel. /* Please, avoid to allocate new SOFTIRQS, if you need not _really_ high frequency threaded job scheduling. For almost all the purposes tasklets is more than

Timers typically play an important role, whether in client applications or server components, including window services. Writing an efficient timer-driven manageable code requires a clear understanding and mastery of the program flow. The subtlety of the net threading model. NET Framework class library provides three different timer classes: System.Windows.Forms.Timer, System.Timers.Timer, and System.Thread

This article was reproduced from: http://blog.csdn.net/dean_gdp/article/details/25481225Basic operation of HrtimerThe traditional Linux timer is implemented by the time-wheel algorithm (TIMER.C), but Hrtimer is implemented by the red-black tree algorithm. In struct Hrtimer There is a node field, which is a struct rb_node, which represents the position of hrtimer in a red-black tree.Hrtimer_startThe Hrtimer_start function adds a hrtimer to a red-black

PWM Timer TIMER0 Learning notes: First, the timer TIMER0 code used in the register. What these register functions are. What is the meaning of the bits involved in the initialization of these registers. : TCFG0 function is: Timer configuration register, you can set the first Prescaler frequency and the second prescaler frequency of the prescaler frequency factor

Create a Timer: Int timer_create (clockid_t clock_id, struct sigevent * EVP, timer_t * timerid) A process can call timer_create () to create a specific timer, which is owned by each process rather than inherited during fork. Clock_id indicates the clock on which the timer is based. * timerid loads the ID of the created timer