From ce34fce82bdb53717da13e5b03aebdb6af8aa84b Mon Sep 17 00:00:00 2001 From: eregon Date: Sat, 17 Aug 2013 11:13:01 +0000 Subject: * process.c: [DOC] MACH_ABSOLUTE_TIME_CLOCK_MONOTONIC is an 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 --- process.c | 10 ++++++++-- 1 file changed, 8 insertions(+), 2 deletions(-) (limited to 'process.c') diff --git a/process.c b/process.c index 551bfd5d84..2ee9f4a04e 100644 --- a/process.c +++ b/process.c @@ -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. -- cgit v1.2.3