gettimeofday() returns a timeval struct. You can get a start value and an end value.
I think I posted on the forums how to do a delta of the times in timeval structs.
getrusage() returns CPU time, which is more useful than elapsed time on a multiprocessing box.
In the event you want cpu information, just using
Code:
time <filename>
at the commandline gives you the same information without having to instrument your code for getrusage().
Hey ppl, i was wonddering, in mandrake, how to get the clok to display the time in non-military format....hehe thank you im just tired of looking at 18:00 hehe thank you (2 Replies)
Hi
We had a AIX box built last year but was set to the correct GMT time, but using DST time zone. In march this year the clocks went forward without issues. (if I remember a couple of weeks early due to the DST zone)
This year we decided to change the clock to the correct time zone before... (0 Replies)
Hi there!!!
Need your help in solving some tricky problems.
Since clock() as such is buggy on SUN OS 5 we have started using gettimeofday() in our RTOS applications based on Solaris 9.
The problems we actually encountered previously were - the applications kind of freeze/hang eternally on... (1 Reply)
Hey everyone! Can someone help me, i need to make a program using awk, that displays the current time (hh/mm/ss), i would really apreciate it! Thanks!
Alex. (4 Replies)
This is a strange one, I've never seen anything like it; the realtime clock doesn't tick while the computer's idle, only when you're watching it. Leave for 3 hours and it'll be 3 hours off. It still advances when it's off however, or the time would be far more incorrect than it is.
About all... (10 Replies)
Hello.
I would like to do this :
A_VAR_FLAG = "ABCD" +------------+...................................+---------+
...............................|.................|...................................|.............|... (7 Replies)
Discussion started by: jcdole
7 Replies
LEARN ABOUT NETBSD
timespec
TIMEVAL(3) BSD Library Functions Manual TIMEVAL(3)NAME
timeval, timespec, itimerval, itimerspec, bintime -- time structures
SYNOPSIS
#include <sys/time.h>
void
TIMEVAL_TO_TIMESPEC(struct timeval *tv, struct timespec *ts);
void
TIMESPEC_TO_TIMEVAL(struct timeval *tv, struct timespec *ts);
DESCRIPTION
The <sys/time.h> header, included by <time.h>, defines various structures related to time and timers.
1. The following structure is used by gettimeofday(2), among others:
struct timeval {
time_t tv_sec;
suseconds_t tv_usec;
};
The tv_sec member represents the elapsed time, in whole seconds. The tv_usec member captures rest of the elapsed time, represented as
the number of microseconds.
2. The following structure is used by nanosleep(2), among others:
struct timespec {
time_t tv_sec;
long tv_nsec;
};
The tv_sec member is again the elapsed time in whole seconds. The tv_nsec member represents the rest of the elapsed time in nanosec-
onds.
A microsecond is equal to one millionth of a second, 1000 nanoseconds, or 1/1000 milliseconds. To ease the conversions, the macros
TIMEVAL_TO_TIMESPEC() and TIMESPEC_TO_TIMEVAL() can be used to convert between struct timeval and struct timespec.
3. The following structure is used by setitimer(2), among others:
struct itimerval {
struct timeval it_interval;
struct timeval it_value;
};
4. The following structure is used by timer_settime(2), among others:
struct itimerspec {
struct timespec it_interval;
struct timespec it_value;
};
Both struct itimerval and struct itimerspec are used to specify when a timer expires. Generally, it_interval specifies the period
between successive timer expirations. A value zero implies that the alarm will fire only once. If it_value is non-zero, it indicates
the time left to the next timer expiration. A value zero implies that the timer is disabled.
5. The following structure is used by bintime(9), among others:
struct bintime {
time_t sec;
uint64_t frac;
};
The sec member specifies the time in seconds and frac represents a 64-bit fraction of seconds. The struct bintime is meant to be used
in the kernel only. It is further described in timecounter(9).
EXAMPLES
It can be stressed that the traditional UNIX timeval and timespec structures represent elapsed time, measured by the system clock (see
hz(9)). The following sketch implements a function suitable for use in a context where the timespec structure is required for a conditional
timeout:
static void
example(struct timespec *spec, time_t minutes)
{
struct timeval elapsed;
(void)gettimeofday(&elapsed, NULL);
_DIAGASSERT(spec != NULL);
TIMEVAL_TO_TIMESPEC(&elapsed, spec);
/* Add the offset for timeout in minutes. */
spec->tv_sec = spec->tv_sec + minutes * 60;
}
A better alternative would use the more precise clock_gettime(2).
SEE ALSO timeradd(3), tm(3), bintime_add(9)BSD April 12, 2011 BSD