From: Thomas Gleixner <tglx@linutronix.de>
To: "Pádraig Brady" <P@draigBrady.com>
Cc: Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
Paul Eggert <eggert@cs.ucla.edu>, bug-gnulib <bug-gnulib@gnu.org>
Subject: Re: nanosleep truncated on 64 bit Linux by 292 billion years
Date: Tue, 28 Oct 2014 16:45:00 +0100 (CET) [thread overview]
Message-ID: <alpine.DEB.2.11.1410281644070.5308@nanos> (raw)
In-Reply-To: <544DC3A8.1060103@draigBrady.com>
[-- Attachment #1: Type: TEXT/PLAIN, Size: 775 bytes --]
On Mon, 27 Oct 2014, Pádraig Brady wrote:
> I noticed that nanosleep() on 64 bit, "only" supports 292 years,
> rather than the full potential 292 billion years with 64 bit time_t, due to:
> https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/tree/include/linux/time.h?id=refs/tags/v3.16#n87
>
> Attached is a program from Paul Eggert that illustrates the bug.
> Running this program on a buggy host outputs something like this:
>
> Setting alarm for 1 second from now ...
> Sleeping for 9223372036854775807.999999999 seconds...
> After alarm sent off, remaining time is 9223357678.462306617 seconds;
> i.e., nanosleep claimed that it slept for about 293079448610.606445 years.
I'm aware of the issue. It's on my ever growing todo list.
Thanks,
tglx
prev parent reply other threads:[~2014-10-28 15:45 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <53E0FF15.4090808@draigBrady.com>
[not found] ` <53E13F04.70609@cs.ucla.edu>
[not found] ` <alpine.DEB.2.10.1408060017090.3323@nanos>
2014-10-27 4:01 ` Pádraig Brady
2014-10-28 15:45 ` Thomas Gleixner [this message]
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