unix timer

Overview The timer is a basic component. Whether it is user space program development or kernel space program development, a timer is often needed as the basic component, the implementation of the timer is also different. This article discusses

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

10.5.2 proficient in timer settings The timer set by the function alarm can only be accurate to seconds, while the following functions can theoretically be accurate to the subtle: #include  #include  int getitimer(int which, struct

The timer set by the function alarm can only be accurate to seconds, while the following functions can theoretically be accurate to the subtle: # Include # Include Int getitimer (INT which, struct itimerval * value ); Int setitimer (INT which,

Author: gaopenghigh (gaopenghigh@gmail.com), reprinted please indicate the source. The kernel needs to do two things about time: Save the current time and date. Maintain the timer. Real-time clock of hardware and circuit (RTC) Real-Time Clock

1. Time Representation In the program, we often need to output the current time of the system, for example, the output result using the date command. At this time, we can use the following two functions: # Include Time_t time (time_t * tloc ); Char *

　　The current development tools of the software industry, from C to C + +, from Java to. NET, new architecture, new components, the knowledge that today just learned, perhaps tomorrow is outdated. In order to gain a foothold in the fierce

Use of timers in Linux -- alarm () & setitimer (): 1. Alarm-------------------------------------------Alarm () and signal () are enough if they are not required to be accurate.Unsigned int alarm (unsigned int seconds)Function Description: Alarm ()

Purgatory Time-out detectionWhen a delayedopeartion time-out (timeout), it needs to be detected and then call its callback method. It seems simple, but it's not easy to do it well.The implementation of the 0.8.x Kafka is straightforward, but

Implementation plan framework In the previous section, we learned how to use the scheduler framework and compared it with the Java timer framework. Next, I will show you how to implement this framework. In addition to the scheduleiterator interface