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* process.c: [DOC] MACH_ABSOLUTE_TIME_CLOCK_MONOTONIC is an

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available emulation for a monotonic clock on Darwin.
  https://developer.apple.com/library/mac/qa/qa1398/_index.html

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@42594 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
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eregon 2013-08-17 11:13:01 +00:00
parent 2a0482b4d4
commit ce34fce82b
2 changed files with 14 additions and 2 deletions
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10
process.c
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@ -6671,14 +6671,20 @@ rb_proc_times(VALUE obj)
* [CLOCK_UPTIME_PRECISE] FreeBSD 8.1
* [CLOCK_SECOND] FreeBSD 8.1
*
* Also, several symbols are accepted as +clock_id+.
* They may be used as emulation for clock_gettime().
* Also, several other symbols are accepted as +clock_id+.
* There are emulations for clock_gettime().
*
* For example, Process::CLOCK_REALTIME is defined as
* +:POSIX_GETTIMEOFDAY_CLOCK_REALTIME+ when clock_gettime() is not available.
*
* Emulations for +:CLOCK_REALTIME+:
* [:POSIX_GETTIMEOFDAY_CLOCK_REALTIME] Use gettimeofday(). The precision is 1 micro second.
* [:POSIX_TIME_CLOCK_REALTIME] Use time(). The precision is 1 second.
*
* Emulations for +:CLOCK_MONOTONIC+:
* [:MACH_ABSOLUTE_TIME_CLOCK_MONOTONIC] Use mach_absolute_time(), available on Darwin.
* The precision is CPU dependent.
*
* If the given +clock_id+ is not supported, Errno::EINVAL is raised.
*
* +unit+ specifies a type of the return value.