Date: Thu, 5 Feb 2015 09:51:51 +0800
From: Fam Zheng <famz@redhat.com>
To: Andy Lutomirski <luto@amacapital.net>
Cc: "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
        Thomas Gleixner <tglx@linutronix.de>, Ingo Molnar <mingo@redhat.com>,
        "H. Peter Anvin" <hpa@zytor.com>, X86 ML <x86@kernel.org>,
        Alexander Viro <viro@zeniv.linux.org.uk>,
        Andrew Morton <akpm@linux-foundation.org>,
        Kees Cook <keescook@chromium.org>,
        David Herrmann <dh.herrmann@gmail.com>,
        Alexei Starovoitov <ast@plumgrid.com>,
        Miklos Szeredi <mszeredi@suse.cz>,
        David Drysdale <drysdale@google.com>, Oleg Nesterov <oleg@redhat.com>,
        "David S. Miller" <davem@davemloft.net>,
        Vivek Goyal <vgoyal@redhat.com>, Mike Frysinger <vapier@gentoo.org>,
        "Theodore Ts'o" <tytso@mit.edu>,
        Heiko Carstens <heiko.carstens@de.ibm.com>,
        Rasmus Villemoes <linux@rasmusvillemoes.dk>,
        Rashika Kheria <rashika.kheria@gmail.com>,
        Hugh Dickins <hughd@google.com>,
        Mathieu Desnoyers <mathieu.desnoyers@efficios.com>,
        Peter Zijlstra <peterz@infradead.org>,
        Linux FS Devel <linux-fsdevel@vger.kernel.org>,
        Linux API <linux-api@vger.kernel.org>,
        Josh Triplett <josh@joshtriplett.org>,
        "Michael Kerrisk (man-pages)" <mtk.manpages@gmail.com>,
        Paolo Bonzini <pbonzini@redhat.com>,
        Omar Sandoval <osandov@osandov.com>
Subject: Re: [PATCH RFC v2 0/7] epoll: Introduce new syscalls,
 epoll_ctl_batch and epoll_pwait1
Message-ID: <20150205015151.GA27112@ad.nay.redhat.com>
References: <1423046213-7043-1-git-send-email-famz@redhat.com>
 <CALCETrV731w37pxM0fzFZ3HHkn=9uoJX0-Rj6XqOf+hCRfnx8w@mail.gmail.com>
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
In-Reply-To: <CALCETrV731w37pxM0fzFZ3HHkn=9uoJX0-Rj6XqOf+hCRfnx8w@mail.gmail.com>
User-Agent: Mutt/1.5.23 (2014-03-12)
Sender: linux-kernel-owner@vger.kernel.org
Content-Length: 1698
Lines: 49

On Wed, 02/04 13:38, Andy Lutomirski wrote:
> On Wed, Feb 4, 2015 at 2:36 AM, Fam Zheng <famz@redhat.com> wrote:
> > 2) epoll_pwait1
> > ---------------
> >
> > NAME
> >        epoll_pwait1 - wait for an I/O event on an epoll file descriptor
> >
> > SYNOPSIS
> >
> >        #include <sys/epoll.h>
> >
> >        int epoll_pwait1(int epfd, int flags,
> >                         struct epoll_event *events,
> >                         int maxevents,
> >                         struct timespec *timeout,
> >                         struct sigargs *sig);
> >
> > DESCRIPTION
> >
> >        The epoll_pwait1 system call differs from epoll_pwait only in parameter
> >        types. The first difference is timeout, a pointer to timespec structure
> >        which allows nanosecond presicion; the second difference, which should
> >        probably be wrapper by glibc and only expose a sigset_t pointer as in
> >        pselect6.
> >
> >        If timeout is NULL, it's treated as if 0 is specified in epoll_pwait
> >        (return immediately). Otherwise it's converted to nanosecond scalar,
> >        again, with the same convention as epoll_pwait's timeout.
> 
> Is the timeout absolute or relative?

Relative. Will document it. We can add a first flag for absolute timeout later.

Thanks.

Fam
> 
> I'd kind of like the ability to set timeouts on multiple clocks at the
> same time, but I can live without that.

Please see my reply to Michael.

Fam
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/