Last major commit and updates for RELENG_7:

- Rework the entire pcm_channel structure:
  * Remove rarely used link placeholder, instead, make each pcm_channel
    as head/link of each own/each other. Unlock - Lock sequence due to
    sleep malloc has been reduced.
  * Implement "busy" queue which will contain list of busy/active
    channels. This greatly reduce locking contention for example while
    servicing interrupt for hardware with many channels or when virtual
    channels reach its 256 peak channels.

- So I heard you like v chan ... O RLY?
  Welcome to Virtual **Record** Channels (vrec, rec vchans, vchans for
  recording, Rec-Chan, you decide), the ultimate solutions for your
  nagging O_RDWR full-duplex wannabe (note: flash plugins) monopolizing
  single record channel causing EBUSY.  Vrec works exactly like Vchans
  (or, should I rename it to "Vplay" :) , except that it operates on the
  opposite direction (recording). Up to 256 vrecs (like vchans) are
  possible.

  Notes:
   * Relocate dev.pcm.%d.{vchans,vchanformat,vchanrate} to each of its
     respective node/direction:
       dev.pcm.%d.play.* for "play"   (cdev = dsp%d.vp%d)
       dev.pcm.%d.rec.*  for "record" (cdev = dsp%d.vr%d)
   * Don't expect that it will magically give you ability to split
     "recording source" (eg: 1 channel for cdrom, 1 channel for mic,
     etc). Just admit that you only have a *single* recording source /
     channel. Please bug your hardware vendor instead :)

- Bump maxautovchans from 4 to 16. For a full-fledged multimedia
  desktop/workstation with too many soundservers installed (esound,
  artsd, jackd, pulse/polypaudio, ding-dong pling plong mudkip fuh fuh,
  etc), 4 seems inadequate. There will be no memory penalty here, since
  virtual channels are allocate only by demand.

- Nuke/Rework the entire statically created cdev entries. Everything is
  clonable through snd own clone manager which designed to withstand many
  kind of abusive devfs droids such as:
      * while : ; do /bin/test -e /dev/dsp ; done
      * jot 16777216 0 | while read x ; do ls /dev/dsp0.$x ; done
      * hundreds (could be thousands) concurrent threads/process opening
	"/dev/dsp" (previously, this might result EBUSY even with just
	3 contesting threads/procs).
  o Reusable clone objects (instead of creating new one like there's no
    tomorrow) after certain expiration deadline. The clone allocator will
    decide whether to reuse, share, or creating new clone.
  o Automatic garbage collector.

- Dynamic unit magic allocator. Maximum attached soundcards can be tuned
  using tunable "hw.snd.maxunit" (Default to 512). Minimum is 16, and
  maximum is 2048.

- ..other fixes, mostly related to concurrency issues.

joel@ will do the manpage updates on sound(4).

Have fun.

1 files changed, 3 insertions, 2 deletions

diff --git a/sys/modules/sound/sound/Makefile b/sys/modules/sound/sound/Makefile
index 5b96cb4..adfd36b 100644
--- a/sys/modules/sound/sound/Makefile
+++ b/sys/modules/sound/sound/Makefile
@@ -1,5 +1,6 @@
 # $FreeBSD$
 
+.PATH: ${.CURDIR}/../../../dev/sound
 .PATH: ${.CURDIR}/../../../dev/sound/pcm
 .PATH: ${.CURDIR}/../../../dev/sound/midi
 .PATH: ${.CURDIR}/../../../dev/sound/isa
@@ -10,9 +11,9 @@ SRCS+=	ac97_if.h channel_if.h feeder_if.h mixer_if.h
 SRCS+=	ac97_if.c channel_if.c feeder_if.c mixer_if.c
 SRCS+=	mpu_if.h mpufoi_if.h synth_if.h
 SRCS+=	mpu_if.c mpufoi_if.c synth_if.c
-SRCS+=	ac97.c ac97_patch.c buffer.c channel.c dsp.c
+SRCS+=	ac97.c ac97_patch.c buffer.c channel.c clone.c dsp.c
 SRCS+=	fake.c feeder.c feeder_fmt.c feeder_rate.c feeder_volume.c
-SRCS+=	mixer.c sndstat.c sound.c vchan.c
+SRCS+=	mixer.c sndstat.c sound.c unit.c vchan.c
 SRCS+=	midi.c mpu401.c sequencer.c
 
 EXPORT_SYMS=	YES	# XXX evaluate