From: Jamie Lokier <jamie@shareable.org>
To: Mark Mielke <mark@mark.mielke.cc>
Cc: Davide Libenzi <davidel@xmailserver.org>,
Lennert Buytenhek <buytenh@math.leidenuniv.nl>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: Re: {sys_,/dev/}epoll waiting timeout
Date: Thu, 23 Jan 2003 18:28:31 +0000 [thread overview]
Message-ID: <20030123182831.GA8184@bjl1.asuk.net> (raw)
In-Reply-To: <20030123172734.GA2490@mark.mielke.cc>
Mark Mielke wrote:
> Or, fix sys_poll(). With the +1, this means that sys_poll() would have
> a 1 in 1001 chance per second of returning one jiffie too early.
Nope. Read the expression again.
> > poll(2) takes an int, but sys_poll() takes a long.
> > I think everyone is confused :)
> > The reason I suggested "long timeout" for ep_poll is because the
> > multiply in the expression:
> > jtimeout = (unsigned long)(timeout*HZ+999)/1000;
> > can overflow if you don't. If you stick with the int, you'll need to
> > write:
> > jtimeout = (((unsigned long)timeout)*HZ+999)/1000;
>
> On a 16 bit platform, perhaps... :-)
Nope. It will overflow on a _64_ bit platform, if you give it a value
of MAXINT for example.
-- Jamie
next prev parent reply other threads:[~2003-01-23 18:19 UTC|newest]
Thread overview: 28+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-01-22 6:55 Lennert Buytenhek
2003-01-22 8:03 ` Jamie Lokier
2003-01-22 12:46 ` Ed Tomlinson
2003-01-22 13:20 ` Jamie Lokier
2003-01-22 19:14 ` Randy.Dunlap
2003-01-22 19:34 ` Jamie Lokier
2003-01-22 19:32 ` Randy.Dunlap
2003-01-23 14:07 ` Davide Libenzi
2003-01-23 15:43 ` Jamie Lokier
2003-01-23 17:27 ` Mark Mielke
2003-01-23 18:28 ` Jamie Lokier [this message]
2003-01-23 20:40 ` Mark Mielke
2003-01-23 22:18 ` Jamie Lokier
2003-01-24 14:41 ` Andreas Schwab
2003-01-25 1:08 ` Davide Libenzi
2003-01-27 21:27 ` bug in select() (was Re: {sys_,/dev/}epoll waiting timeout) Bill Rugolsky Jr.
2003-01-27 22:52 ` Davide Libenzi
2003-01-28 9:45 ` Jamie Lokier
2003-01-28 10:52 ` Mark Mielke
2003-01-28 21:39 ` Jamie Lokier
2003-01-28 22:15 ` Davide Libenzi
2003-01-28 19:42 ` {sys_,/dev/}epoll waiting timeout Randy.Dunlap
2003-01-28 21:36 ` Jamie Lokier
2003-01-28 21:44 ` David Mosberger
[not found] <20030122080322.GB3466@bjl1.asuk.net.suse.lists.linux.kernel>
[not found] ` <Pine.LNX.4.33L2.0301281139570.30636-100000@dragon.pdx.osdl.net.suse.lists.linux.kernel>
[not found] ` <20030128213621.GA29036@bjl1.asuk.net.suse.lists.linux.kernel>
2003-01-28 21:55 ` Andi Kleen
2003-01-28 22:24 ` Davide Libenzi
2003-01-28 22:39 ` Andi Kleen
2003-01-28 23:00 ` Davide Libenzi
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