AIX TIME CHANGE Post: 302488483

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Operating Systems AIX AIX TIME CHANGE Post 302488483 by m.d.ludwig on Monday 17th of January 2011 10:52:27 AM

01-17-2011

Registered User

sleep 1 will sleep for around one second. Given the vagaries of multiuser systems, clock timings, and cosmic rays (you can never tell) -- sleep might run for 0.9 seconds or 1.05 seconds. Add to that time the amount of time that date takes to run, and I can easily see seconds being skipped:

09:12:03.75 - date runs, prints 09:12:03
09:12:04.05 - sleep runs
09:12:05:06 - date runs, prints 09:12:05

I would expect even a simple C-program such as:

Code:

#include <stdio.h>
#include <time.h>

void main(int argc, char **argv) {
    while (1) {
        sleep(1);
        printf("%ld\n", time((void *) 0));
    }
}

to skip a second now and again, although a lot less frequently.

If you need accuracy, look at time(7).

m.d.ludwig

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LEARN ABOUT DEBIAN

sleep

SLEEP(3)						     Linux Programmer's Manual							  SLEEP(3)

NAME

       sleep - sleep for the specified number of seconds

SYNOPSIS

       #include <unistd.h>

       unsigned int sleep(unsigned int seconds);

DESCRIPTION

       sleep() makes the calling thread sleep until seconds seconds have elapsed or a signal arrives which is not ignored.

RETURN VALUE

       Zero if the requested time has elapsed, or the number of seconds left to sleep, if the call was interrupted by a signal handler.

CONFORMING TO

       POSIX.1-2001.

BUGS

       sleep() may be implemented using SIGALRM; mixing calls to alarm(2) and sleep() is a bad idea.

       Using longjmp(3) from a signal handler or modifying the handling of SIGALRM while sleeping will cause undefined results.

SEE ALSO

       alarm(2), nanosleep(2), signal(2), signal(7)

COLOPHON

       This  page is part of release 3.44 of the Linux man-pages project.  A description of the project, and information about reporting bugs, can
       be found at http://www.kernel.org/doc/man-pages/.

GNU
								    2010-02-03								  SLEEP(3)

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