11-02-2009
The library call "gethrtime()" and the type "hrtime_t" are Solaris features. IIRC they're in "time.h". I used them because I was on Solaris at the time and they provide nanosecond resolution. The drawback of gethrtime() is that it has no reference frame so it's only a relative time - the value returned by gethrtime() is only meaningful when compared to the value from another call to gethrtime(), and then probably only from within the same process.
It's great for timing durations within a process but that's about it.
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LEARN ABOUT SUNOS
gethrtime
gethrtime(3C) Standard C Library Functions gethrtime(3C)
NAME
gethrtime, gethrvtime - get high resolution time
SYNOPSIS
#include <sys/time.h>
hrtime_t gethrtime(void);
hrtime_t gethrvtime(void);
DESCRIPTION
The gethrtime() function returns the current high-resolution real time. Time is expressed as nanoseconds since some arbitrary time in the
past; it is not correlated in any way to the time of day, and thus is not subject to resetting or drifting by way of adjtime(2) or settime-
ofday(3C). The hi-res timer is ideally suited to performance measurement tasks, where cheap, accurate interval timing is required.
The gethrvtime() function returns the current high-resolution LWP virtual time, expressed as total nanoseconds of execution time.
The gethrtime() and gethrvtime() functions both return an hrtime_t, which is a 64-bit (long long) signed integer.
EXAMPLES
The following code fragment measures the average cost of getpid(2):
hrtime_t start, end;
int i, iters = 100;
start = gethrtime();
for (i = 0; i < iters; i++)
getpid();
end = gethrtime();
printf("Avg getpid() time = %lld nsec
", (end - start) / iters);
ATTRIBUTES
See attributes(5) for descriptions of the following attributes:
+-----------------------------+-----------------------------+
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
+-----------------------------+-----------------------------+
|MT-Level |MT-Safe |
+-----------------------------+-----------------------------+
SEE ALSO
proc(1), adjtime(2), gettimeofday(3C), settimeofday(3C), attributes(5)
NOTES
Although the units of hi-res time are always the same (nanoseconds), the actual resolution is hardware dependent. Hi-res time is guaran-
teed to be monotonic (it won't go backward, it won't periodically wrap) and linear (it won't occasionally speed up or slow down for adjust-
ment, like the time of day can), but not necessarily unique: two sufficiently proximate calls may return the same value.
SunOS 5.10 7 Sep 2004 gethrtime(3C)