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| author | Michael Kerrisk <mtk.manpages@gmail.com> | 2013-08-19 12:46:30 +0200 |
|---|---|---|
| committer | Michael Kerrisk <mtk.manpages@gmail.com> | 2013-08-19 12:46:30 +0200 |
| commit | fa182455edbd89e9f33a4ba6aab8db72809973c1 (patch) | |
| tree | 50879241bec1c56019170bae9b3ee7162f4e94eb | |
| parent | 09d3c20c0dd97586f4978253a24327767a2a13e6 (diff) | |
clock.3: clock() switched from using times(2) to clock_gettime() in glibc 2.18
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
| -rw-r--r-- | man3/clock.3 | 13 |
1 files changed, 12 insertions, 1 deletions
diff --git a/man3/clock.3 b/man3/clock.3 index 4d85564b..8cab0111 100644 --- a/man3/clock.3 +++ b/man3/clock.3 @@ -26,7 +26,7 @@ .\" Modified 14 Jun 2002, Michael Kerrisk <mtk.manpages@gmail.com> .\" Added notes on differences from other UNIX systems with respect to .\" waited-for children. -.TH CLOCK 3 2008-08-28 "GNU" "Linux Programmer's Manual" +.TH CLOCK 3 2013-08-19 "GNU" "Linux Programmer's Manual" .SH NAME clock \- determine processor time .SH SYNOPSIS @@ -83,6 +83,17 @@ The .BR times (2) function, which explicitly returns (separate) information about the caller and its children, may be preferable. + +In glibc 2.17 and earlier, +.BR clock () +was implemented on top of +.BR times (2). +For improved precision, +since glibc 2.18, it is implemented on top of +.BR clock_gettime (2) +(using the +.BR CLOCK_PROCESS_CPUTIME_ID +clock). .SH SEE ALSO .BR clock_gettime (2), .BR getrusage (2), |