Date: Sun, 28 Jan 1996 18:44:20 -0800 (PST) From: Jeffrey Hsu <hsu> To: FreeBSD-gnats-submit@freebsd.org Subject: kern/975: getrusage returns negative deltas Message-ID: <199601290244.SAA20763@freefall.freebsd.org> Resent-Message-ID: <199601290250.SAA20985@freefall.freebsd.org>
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>Number: 975
>Category: kern
>Synopsis: getrusage returns negative deltas
>Confidential: no
>Severity: serious
>Priority: high
>Responsible: freebsd-bugs
>State: open
>Class: sw-bug
>Submitter-Id: current-users
>Arrival-Date: Sun Jan 28 18:50:01 PST 1996
>Last-Modified:
>Originator: Jeffrey &
>Organization:
>Release: FreeBSD 2.1-STABLE i386 and -current
>Environment:
>Description:
Two calls to getrusage(). The second call indicates that the process has
used less time resource then the first call.
>How-To-Repeat:
Run the following program a bunch of times.
#include <sys/types.h>
#include <sys/time.h>
#include <sys/resource.h>
#include <stdio.h>
main()
{
struct rusage r, r2;
getrusage(RUSAGE_SELF, &r);
printf("user %d sec %d usec\n", r.ru_utime.tv_sec, r.ru_utime.tv_usec);
printf("system %d sec %d usec\n", r.ru_stime.tv_sec,
r.ru_stime.tv_usec);
getrusage(RUSAGE_SELF, &r2);
printf("user %d sec %d usec\n", r2.ru_utime.tv_sec,
r2.ru_utime.tv_usec);
printf("system %d sec %d usec\n", r2.ru_stime.tv_sec,
r2.ru_stime.tv_usec);
if (r2.ru_utime.tv_sec - r.ru_utime.tv_sec < 0)
printf("user time negative\n");
if (r2.ru_utime.tv_usec - r.ru_utime.tv_usec < 0)
printf("user time negative\n");
if (r2.ru_stime.tv_sec - r.ru_stime.tv_sec < 0)
printf("system time negative\n");
if (r2.ru_stime.tv_usec - r.ru_stime.tv_usec < 0)
printf("system time negative\n");
}
>Fix:
>Audit-Trail:
>Unformatted:
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