From owner-freebsd-current@FreeBSD.ORG Sat Jan 24 13:08:37 2004 Return-Path: Delivered-To: freebsd-current@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id 1D1F516A4CE for ; Sat, 24 Jan 2004 13:08:37 -0800 (PST) Received: from email02.aon.at (WARSL402PIP7.highway.telekom.at [195.3.96.94]) by mx1.FreeBSD.org (Postfix) with SMTP id F362143D3F for ; Sat, 24 Jan 2004 13:08:33 -0800 (PST) (envelope-from shoesoft@gmx.net) Received: (qmail 145862 invoked from network); 24 Jan 2004 21:08:32 -0000 Received: from m114p004.dipool.highway.telekom.at (HELO ?62.46.4.36?) ([62.46.4.36]) (envelope-sender ) by qmail2rs.highway.telekom.at (qmail-ldap-1.03) with SMTP for ; 24 Jan 2004 21:08:32 -0000 From: Stefan Ehmann To: Mathew Kanner In-Reply-To: <20040124200343.GP64193@cnd.mcgill.ca> References: <1074937301.2959.7.camel@shoeserv.freebsd> <20040124191514.GO64193@cnd.mcgill.ca> <1074973701.719.4.camel@shoeserv.freebsd> <20040124200343.GP64193@cnd.mcgill.ca> Content-Type: text/plain Message-Id: <1074978522.690.12.camel@shoeserv.freebsd> Mime-Version: 1.0 X-Mailer: Ximian Evolution 1.4.5 Date: Sat, 24 Jan 2004 22:08:42 +0100 Content-Transfer-Encoding: 7bit cc: truckman@FreeBSD.org cc: current@freebsd.org Subject: Re: write(2) lc_r problem X-BeenThere: freebsd-current@freebsd.org X-Mailman-Version: 2.1.1 Precedence: list List-Id: Discussions about the use of FreeBSD-current List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sat, 24 Jan 2004 21:08:37 -0000 On Sat, 2004-01-24 at 21:03, Mathew Kanner wrote: > On Jan 24, Stefan Ehmann wrote: > > On Sat, 2004-01-24 at 20:15, Mathew Kanner wrote: > > > On Jan 24, Stefan Ehmann wrote: > > > > I'm trying to write a small sound application and run across a problem > > > > on CURRENT. > > > > > > > > It's very basic at the moment. It simply reads pcm data from a file and > > > > uses write(2) on /dev/dsp. > > > > > > > > But as soon as I link the program with -lc_r there's always about 1 > > > > second delay before a write call - which makes it pretty unusable for > > > > playing sound. > > > > > > > > It should be easy reproducable if you link audio/waveplay with -lc_r. > > > > > > > > This doesn't happen in either FreeBSD 4.9, Knoppix or CURRENT if linked > > > > with -lkse or -lthr. > > > > > > > > Am I'm missing something basic when using write together with lc_r or > > > > ist this a bug in CURRENT? > > > > > > There is definetly a bug with the sound code when using vchans > > > and select. Make sure that (using sysctl) > > > > > > hw.snd.maxautovchans=0 > > > hw.snd.pcmX.vchans=0 > > > > You're right, that fixed it. That's also the reason why it worked on > > stable (vchans was disabled there). > > Please try this untested patch with vchans enabled. > Great, now it also works with vchans enabled. I'm also testing a pcm patch by truckman@ at the moment. Unfortunately those two combined don't run nicely. Panicstring: mutex pcm0:virtual:0 not owned at /usr/src/sys/dev/sound/pcm/channel.c:90