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Date: Mon, 25 Jun 2007 14:50:36 +0200 From: Takashi Iwai <tiwai@...e.de> To: Olivier Galibert <galibert@...ox.com> Cc: Jan Engelhardt <jengelh@...putergmbh.de>, Tomasz K?oczko <kloczek@...y.mif.pg.gda.pl>, Alan Cox <alan@...rguk.ukuu.org.uk>, linux-kernel@...r.kernel.org Subject: Re: Is it time for remove (crap) ALSA from kernel tree ? At Mon, 25 Jun 2007 14:47:50 +0200, Olivier Galibert wrote: > > On Mon, Jun 25, 2007 at 02:40:23PM +0200, Jan Engelhardt wrote: > > > > On Jun 25 2007 14:31, Takashi Iwai wrote: > > >> It was started in time when most cheap sound cards was without hw mixer. > > >> And .. when today you use ALSA on sound card without hw mixer still all > > >> this (past ?) problems are actual. > > > > > >Huh? I have no problems with soft mixing... > > > > Diverging from the discussion, how is soft mixing actually done? If it was done > > in userspace, it would need shared memory, or a back relay from kernelspace to > > userspace (and back again for the final output), otherwise I could not imagine > > how all alsa streams came together at one point. > > SysV shared memory and semaphores, done in the alsa lib. > > Yes, your kernel sound access library does shared mem, semaphores, > fork+exec and friends. FYI, fork+exec was removed long time ago. shmem and semaphores still remain, though. Takashi - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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