[Bug 29531] Folder navigation causes audio playback glitches in CDBurnerXP

[wine-bugs at winehq.org]

http://bugs.winehq.org/show_bug.cgi?id=29531

--- Comment #10 from Jörg Höhle <hoehle at users.sourceforge.net> 2012-03-09 04:56:58 CST ---
Created attachment 39263
  --> http://bugs.winehq.org/attachment.cgi?id=39263
lock-free winealsa renderer

>The sketch of the lock-less design is as follows.
Here's an implementation.  It requires the fix #2 from bug #30071 such that
IAC_Reset cannot be executed while the callback is running.

I'd appreciate if somebody with a multi-core machine would test it.  A mmdevapi
render test loop ran fine while recompiling Wine and starting Firefox.  I don't
consider lock-less to be a silver bullet.  If Linux decides to let other
threads run for 100ms, an underrun will occur.  Lock-less simply means less
contention, giving Linux less reasons to schedule another thread.  Also, ALSA
may use locks or a mutex internally, so our renderer calling snd_pcm_write
while the mmdevapi app calls IAC_GetPosition => snd_pcm_avail&delay still
causes a contention.  We can be happy that IAC_GetCurrentPadding avoids going
through ALSA.

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