[GitHub] [incubator-nuttx] xiaoxiang781216 edited a comment on pull request #5432: sched/wdog: fix delay calculation in wd_start()

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xiaoxiang781216 edited a comment on pull request #5432:
URL: https://github.com/apache/incubator-nuttx/pull/5432#issuecomment-1031237159


   > If this change will be rejected I will probably need to implement something like http://www.makelinux.net/ldd3/chp-7-sect-4.shtml and base POSIX timers and `timerfd` on top of it.
   
   Linux timer API even with the latest code still suffer the same issue as wdog since both use the tick as unit. You should add a new set API like hrtimer which use nanosecond unit: https://www.kernel.org/doc/html/latest/timers/hrtimers.html. And implement all other timer related api on top of hrtimer. Since the unit of arch(up_alarm_xxx or up_timer_exx) API in tickless mode use nanosecond unit, it's very lucky that we don't need introduce the new arch API to support the high resolution timer.
   


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