From owner-freebsd-arch@FreeBSD.ORG  Fri Nov 23 19:49:00 2012
Return-Path: <owner-freebsd-arch@FreeBSD.ORG>
Delivered-To: arch@freebsd.org
Received: from mx1.freebsd.org (mx1.freebsd.org [69.147.83.52])
 by hub.freebsd.org (Postfix) with ESMTP id 7D2BCDD2
 for <arch@freebsd.org>; Fri, 23 Nov 2012 19:49:00 +0000 (UTC)
 (envelope-from yanegomi@gmail.com)
Received: from mail-ob0-f182.google.com (mail-ob0-f182.google.com
 [209.85.214.182])
 by mx1.freebsd.org (Postfix) with ESMTP id 3B0BD8FC12
 for <arch@freebsd.org>; Fri, 23 Nov 2012 19:48:59 +0000 (UTC)
Received: by mail-ob0-f182.google.com with SMTP id 16so11881313obc.13
 for <arch@freebsd.org>; Fri, 23 Nov 2012 11:48:59 -0800 (PST)
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113;
 h=mime-version:in-reply-to:references:date:message-id:subject:from:to
 :cc:content-type;
 bh=pXuuhXmcJkLB05ZbFemF8jULJdQ2v/5vYzPLmilmjBU=;
 b=troIGBDJuJh7qBG78HyRuuDES6/wWoE6y7vgQ3DsQBumHuemkIBjzxSXdTgS5mvmaq
 Fg11JnJk+kYfxC3eGkF2vPgf0R7LGrxqGO77wMYYqx63Mp4CAoVAm3/iW8kTOARBx5r/
 KEcVaDWG8R5h83zC0AfY9KQHOMnjBTWZxjIaYmoO3xHdBGsn+RW3tZi3l5ZlieyMrQpD
 ICSsEnNkgl4fX5TgqpmnYQXGUTORHieh6u1CfAx5z9nmwHCu3rkn3Q4lhcIwzvXKl0oB
 0vA18rsRtYxmrBtsdxpe3qRDV6/UVvoWRtq2SeTLPPE8vBw+n8Honeaxfs8A4z48gVYb
 7aAA==
MIME-Version: 1.0
Received: by 10.182.172.74 with SMTP id ba10mr3681965obc.83.1353700139326;
 Fri, 23 Nov 2012 11:48:59 -0800 (PST)
Received: by 10.76.143.33 with HTTP; Fri, 23 Nov 2012 11:48:59 -0800 (PST)
In-Reply-To: <E5FE70A7-D2D2-4021-950B-48FD84F11F08@bluezbox.com>
References: <E5FE70A7-D2D2-4021-950B-48FD84F11F08@bluezbox.com>
Date: Fri, 23 Nov 2012 11:48:59 -0800
Message-ID: <CAGH67wS4toXOss=ZLWYn4zoHwzaFF9qg=TMVchGf7a257VSqnQ@mail.gmail.com>
Subject: Re: [RFC] sema_wait_sig
From: Garrett Cooper <yanegomi@gmail.com>
To: Oleksandr Tymoshenko <gonzo@bluezbox.com>
Content-Type: text/plain; charset=ISO-8859-1
Cc: arch@freebsd.org
X-BeenThere: freebsd-arch@freebsd.org
X-Mailman-Version: 2.1.14
Precedence: list
List-Id: Discussion related to FreeBSD architecture <freebsd-arch.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/options/freebsd-arch>,
 <mailto:freebsd-arch-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/freebsd-arch>
List-Post: <mailto:freebsd-arch@freebsd.org>
List-Help: <mailto:freebsd-arch-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-arch>,
 <mailto:freebsd-arch-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Fri, 23 Nov 2012 19:49:00 -0000

On Thu, Nov 22, 2012 at 10:12 PM, Oleksandr Tymoshenko
<gonzo@bluezbox.com> wrote:
> Hello,
>
> Is there any particular reason FreeBSD does not have sema_wait_sig
> function? It seems to be easily implementable using cv_wait_sig
> function.
>
> The reason I'm asking is that I'm getting some Linux drivers
> ported to FreeBSD and the code in question relies on semaphores
> and there is no obvious alternative to down_interruptible function.
> I realize that not all approaches to driver development are easily
> mappable from OS to OS but in this case lack of cv_wait_sig seems
> like gap in API. Unless of course there is strong rationale behind it.

     There were a bunch of ACKs when John Polstra wanted to do work
add sema_wait_sig, but it looks like the work wasn't completed (or at
least not committed back to FreeBSD proper):
http://unix.derkeiler.com/Mailing-Lists/FreeBSD/arch/2004-06/0074.html
.
HTH,
-Garrett