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git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@42678 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
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akr 2013-08-24 02:19:41 +00:00
parent 8eb27cb16f
commit cd9f60dfa5
1 changed files with 10 additions and 5 deletions
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15
process.c
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@ -6867,7 +6867,12 @@ make_clock_result(struct timetick *ttp,
* [CLOCK_UPTIME_PRECISE] FreeBSD 8.1
* [CLOCK_SECOND] FreeBSD 8.1
*
* Also, several other symbols are accepted as +clock_id+.
* Note that SUS stands for Single Unix Specification.
* SUS contains POSIX and clock_gettime is defined in the POSIX part.
* SUS defines CLOCK_REALTIME mandatory but
* CLOCK_MONOTONIC, CLOCK_PROCESS_CPUTIME_ID and CLOCK_THREAD_CPUTIME_ID are optional.
*
* Also, several symbols are accepted as +clock_id+.
* There are emulations for clock_gettime().
*
* For example, Process::CLOCK_REALTIME is defined as
@ -6875,7 +6880,7 @@ make_clock_result(struct timetick *ttp,
*
* Emulations for +CLOCK_REALTIME+:
* [:GETTIMEOFDAY_BASED_CLOCK_REALTIME]
* Use gettimeofday() defined by Single Unix Specification.
* Use gettimeofday() defined by SUS.
* (SUSv4 obsoleted it, though.)
* The resolution is 1 micro second.
* [:TIME_BASED_CLOCK_REALTIME]
@ -6889,7 +6894,7 @@ make_clock_result(struct timetick *ttp,
*
* Emulations for +CLOCK_PROCESS_CPUTIME_ID+:
* [:GETRUSAGE_BASED_CLOCK_PROCESS_CPUTIME_ID]
* Use getrusage() defined by Single Unix Specification.
* Use getrusage() defined by SUS.
* getrusage() is used with RUSAGE_SELF to obtain the time only for
* the calling process (excluding the time for child processes).
* The result is addition of user time (ru_utime) and system time (ru_stime).
@ -6906,10 +6911,10 @@ make_clock_result(struct timetick *ttp,
* Use clock() defined by ISO C.
* The resolution is 1/CLOCKS_PER_SEC.
* CLOCKS_PER_SEC is the C-level macro defined by time.h.
* Single Unix Specification defines CLOCKS_PER_SEC is 1000000.
* SUS defines CLOCKS_PER_SEC is 1000000.
* Non-Unix systems may define it a different value, though.
* If CLOCKS_PER_SEC is 1000000 as SUS, the resolution is 1 micro second.
* If clock_t is 32 bit and CLOCKS_PER_SEC is 1000000, it overflows for each 72 minutes.
* If CLOCKS_PER_SEC is 1000000 and clock_t is 32 bits integer type, it cannot represent over 72 minutes.
*
* If the given +clock_id+ is not supported, Errno::EINVAL is raised.
*