[GitHub] [mynewt-core] andrzej-kaczmarek opened a new pull request #2112: kernel/os: Fix sanity interval handling

[GitBox <gi...@apache.org>]

andrzej-kaczmarek opened a new pull request #2112: kernel/os: Fix sanity interval handling
URL: https://github.com/apache/mynewt-core/pull/2112
 
 
   Previous check causes idle task to skip sanity check if wake up occured
   at the same tick when sanity should happen. This should not be a problem
   because iticks will be 0 and sanity check will be performed after wakeup
   on next tick. The only side effect should be wake up on 2 consecutive
   ticks. However...
   
   It is (unlikely but) possible that (at least) one tick occurs between
   check and entering critical section. If this happens on a tick where
   sanity check is skipped, time to next sanity is calculated as a negative
   value instead of 0 so depending on time to next sched/callout we may not
   wake up for sanity and tickle watchdog on time.

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