There are several timings in linux

There are four common timings in Linux: 1. Hardware timer, which is provided by the computer’s clock source and managed by the kernel driver; 2. Timer interrupt, through which the kernel can implement periodic timing operations. ; 3. Software timer, a scheduled operation implemented through programming; 4. Timing task scheduling service, Linux provides cron and its related tools for regularly executing specific commands or scripts.

The operating system of this tutorial: Linux5.18.14 system, Dell G3 computer.

In Linux, there are the following common timing methods:

1. Hardware timer:

   Linux kernel support Use hardware timers for high-precision timing operations. Hardware timers are typically provided by the computer's clock source and managed by a kernel driver. Hardware timers can be created and set using system calls such as timer_create(), timer_settime(), etc.

2. Timer interrupt:

   The kernel can implement periodic timing operations through timer interrupts. At each fixed time interval, the timer interrupt is triggered, and then the kernel executes the corresponding processing function or scheduling task. This timing method can be used to implement scheduled task scheduling and periodic operations.

3. Software timer:

   Software timer is a timing operation implemented through programming. You can use sleep(), usleep(), nanosleep() and other functions in the application to pause the specified time interval and implement scheduled operations. Software timers are suitable for simple timing needs.

4. Scheduled task scheduling service:

   Linux provides cron and its related tools for regularly executing specific commands or scripts. cron allows users to schedule the execution of tasks based on a schedule. You can use the crontab command to edit the cron table and set the execution time and frequency of scheduled tasks.

The above are common timing methods in Linux. Which timing method to use depends on the specific needs and scenarios.

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