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hrtime.h: add note explaining current use of uint64_t [ci skip] 

[ruby-core:88678]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@64554 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
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normal 2018-08-27 08:48:49 +00:00
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hrtime.h
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@ -8,7 +8,8 @@
/* /*
* Hi-res monotonic clock. It is currently nsec resolution, which has over * Hi-res monotonic clock. It is currently nsec resolution, which has over
* 500 years of range (unsigned). * 500 years of range (with an unsigned 64-bit integer). Developers
* targeting small systems may try 32-bit and low-resolution (milliseconds).
* *
* TBD: Is nsec even necessary? usec resolution seems enough for userspace * TBD: Is nsec even necessary? usec resolution seems enough for userspace
* and it'll be suitable for use with devices lasting over 500,000 years * and it'll be suitable for use with devices lasting over 500,000 years