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Posted to commits@nuttx.apache.org by GitBox <gi...@apache.org> on 2021/04/11 21:56:25 UTC

[GitHub] [incubator-nuttx] btashton edited a comment on issue #3516: clock() and CLOCKS_PER_SEC is not POSIX compliant

btashton edited a comment on issue #3516:
URL: https://github.com/apache/incubator-nuttx/issues/3516#issuecomment-817378907


   My reading of the opengroup page is that it is OK if `CLOCKS_PER_SEC` is not 1M, as it is suppose to be the definition of C N1256 standard (which has no requirement for this), it just usually is 1M.  What is important is that `clock()` / `CLOCKS_PER_SEC` is gives to process duration. Because we are using `clock_systime_ticks` this is not correct. 
   
   My understanding is that we should to make clock() return the process ticks.  It would be _nice_ if we made CLOCKS_PER_SEC be 1M, but it would be ideal to just hide this in the clock() interfaces and use a real CLOCKS_PER_SEC in the OS internals.  This second bit I don't think is technically required.


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