[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 #5 from Jörg Höhle <hoehle at users.sourceforge.net> 2012-01-23 08:18:37 CST ---
Bug #29585, comment #3 is more appropriate here.  Another improvement to
winealsa and wineoss design is to split the use of the critical section
This->lock:
a) One prevents several app threads from calling the API concurrently.
b) The second one shall prevent the internal callback from operating on the
slots that Get/ReleaseBuffer modify concurrently.

It is not good that bombarding the API with ReleaseBuffer(0) or
GetCurrentPadding blocks the audio callback.  Instead of an internal lock, we
should investigate the opportunity for a lock-less design.  Then, the kernel
would never put the callback to sleep in EnterCriticalSection.  What kernel
expert knows how much later a thread recovers from such a sleep?

The ancient ALSA player never used EnterCS except perhaps when logging, or with
SetEvent, or when receiving a message for which there existed a specific CS
wwo->msgRing.msg_crst
http://source.winehq.org/source//dlls/winealsa.drv/waveout.c?v=wine-1.3.24

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