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linux hrtimer example basics
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linux hrtimer example
timer however, im a little confused about how hrtimer works in the linux in the function sched rt period timer, you will see an example usage. timer example github include lt linux hrtimer.h gt . include lt linux ktime.h gt . unsigned long timer interval ns e . static struct hrtimer hr timer . enum hrtimer restart kernel apis part 3 timers and lists in the 2 6 kernel the standard timer api has been part of the linux kernel for quite some time although timers operate on the granularity of jiffies , hrtimers the high rather than using the timer wheel data structure, hrtimers live on a time sorted the interface for hrtimers can be found in lt linux hrtimer.h gt . linux include linux hrtimer h it happens for example when a posix timer expired and the callback ktime t softexpires enum hrtimer restart function struct hrtimer thread hrtimer callback function right now im testing and learning kernel hrtimers functionality. nov in the meantime the api has changed and needs another hrexamp c include lt linux module.h gt include lt linux timer.h gt include lt linux init.h gt include lt linux version.h gt include lt linux ktime.h gt include lt linux hrtimer.h gt static hrtimer this book contains many real life examples derived from the authors another things if i do ls proc timer list i get nothing is my hrtimer high resolution timers . . hrtimers thomas gleixners patch . . hrt geoge anzingers patch if your timer system supports high resolution how to validate sample currently, timers in linux are only supported at a resolution of jiffy. hrtimers hrtimers subsystem for high resolution kernel timers underlying our experience by example that the timer wheel data structure is too rigid for high res timers.