Issue #12808 has been updated by Yui NARUSE.

Status changed from Open to Closed

It will be an Ruby 2.4 feature by r56200.

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Bug #12808: Ruby builds do not produce Process::UPTIME constant on macOS Sierra
https://bugs.ruby-lang.org/issues/12808#change-60764

* Author: Andrew Smith
* Status: Closed
* Priority: Normal
* Assignee: 
* ruby -v: ruby 2.1.9p490 (2016-03-30 revision 54437) [x86_64-darwin16]
* Backport: 2.1: UNKNOWN, 2.2: UNKNOWN, 2.3: UNKNOWN
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Due to the fact that macOS Sierra does not define CLOCK_UPTIME in /usr/include/time.h the UPTIME constant is never generated during the Ruby build.

macOS defines CLOCK_UPTIME_RAW instead as..

clock that increments monotonically, in the same manner as CLOCK_MONOTONIC_RAW, but that does not increment while the system is asleep.  The returned value
is identical to the result of mach_absolute_time() after the appropriate mach_timebase conversion is applied.

It appears this is done to provide a selection for uptime value based on sleeping or non sleeping return value.





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