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Adjust code that tries to prevent cc_microtime() from going backwards 

so that it doesn't fire when called twice in the same microsecond,
which can lead to large error accumulation.

Appears to fix "repeated gettimeofday() goes backwards" on a fast
alpha and i386 box.
This commit is contained in:
nathanw 2004-05-18 16:09:07 +00:00
parent 84a60cd2d9
commit 78c16ce8ed
1 changed files with 3 additions and 3 deletions
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6
sys/kern/kern_microtime.c
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@ -1,4 +1,4 @@
/* $NetBSD: kern_microtime.c,v 1.4 2003/06/28 15:02:24 simonb Exp $ */
/* $NetBSD: kern_microtime.c,v 1.5 2004/05/18 16:09:07 nathanw Exp $ */
/*-
* Copyright (c) 2001 The NetBSD Foundation, Inc.
@ -54,7 +54,7 @@
#include <sys/cdefs.h> /* RCS ID & Copyright macro defns */
__KERNEL_RCSID(0, "$NetBSD: kern_microtime.c,v 1.4 2003/06/28 15:02:24 simonb Exp $");
__KERNEL_RCSID(0, "$NetBSD: kern_microtime.c,v 1.5 2004/05/18 16:09:07 nathanw Exp $");
#include "opt_multiprocessor.h"
@ -137,7 +137,7 @@ cc_microtime(struct timeval *tvp)
usec += 1000000;
sec--;
}
if (sec == 0) {
if (sec == 0 && usec > 0) {
t.tv_usec += usec + 1;
if (t.tv_usec >= 1000000) {
t.tv_usec -= 1000000;