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Diffstat (limited to 'man3/clock.3')
| -rw-r--r-- | man3/clock.3 | 29 |
1 files changed, 16 insertions, 13 deletions
diff --git a/man3/clock.3 b/man3/clock.3 index 49d92238c3..6dfce042ac 100644 --- a/man3/clock.3 +++ b/man3/clock.3 @@ -48,23 +48,11 @@ T} Thread safety MT-Safe .hy .ad .sp 1 -.SH STANDARDS -POSIX.1-2001, POSIX.1-2008, C89, C99. +.SH VERSIONS XSI requires that .B CLOCKS_PER_SEC equals 1000000 independent of the actual resolution. -.SH NOTES -The C standard allows for arbitrary values at the start of the program; -subtract the value returned from a call to -.BR clock () -at the start of the program to get maximum portability. -.PP -Note that the time can wrap around. -On a 32-bit system where -.B CLOCKS_PER_SEC -equals 1000000 this function will return the same -value approximately every 72 minutes. .PP On several other implementations, the value returned by @@ -84,6 +72,10 @@ The .BR times (2) function, which explicitly returns (separate) information about the caller and its children, may be preferable. +.SH STANDARDS +C11, POSIX.1-2008. +.SH HISTORY +POSIX.1-2001, C89. .PP In glibc 2.17 and earlier, .BR clock () @@ -95,6 +87,17 @@ since glibc 2.18, it is implemented on top of (using the .B CLOCK_PROCESS_CPUTIME_ID clock). +.SH NOTES +The C standard allows for arbitrary values at the start of the program; +subtract the value returned from a call to +.BR clock () +at the start of the program to get maximum portability. +.PP +Note that the time can wrap around. +On a 32-bit system where +.B CLOCKS_PER_SEC +equals 1000000 this function will return the same +value approximately every 72 minutes. .SH SEE ALSO .BR clock_gettime (2), .BR getrusage (2), |