Date: Wed, 6 Jun 2012 13:45:05 -0600 From: Warner Losh <imp@bsdimp.com> To: John Baldwin <jhb@FreeBSD.org> Cc: Konstantin Belousov <kostikbel@gmail.com>, freebsd-arch@FreeBSD.org Subject: Re: Fast gettimeofday(2) and clock_gettime(2) Message-ID: <78461459-8D90-4AD1-9983-3522E4DA5816@bsdimp.com> In-Reply-To: <201206061423.53179.jhb@freebsd.org> References: <20120606165115.GQ85127@deviant.kiev.zoral.com.ua> <201206061423.53179.jhb@freebsd.org>
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On Jun 6, 2012, at 12:23 PM, John Baldwin wrote: > 2) You read tk->tk_boottime without the tk_current protection in your > non-uptime routines. This is racey as the kernel alters the > boottime when it skews time for large adjustments from ntp, etc. One of the 'etc' is leap seconds. Warner
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