[SPAM] [Winmm/winealsa] Don't use asynchronous callbacks in dsound any more

[a_villacis at palosanto.com]

> Instead of using asynchronous callbacks that uses signals, use a
> seperate thread that can be cancelled, this prevents deadlock issues.
>
> Basically we use snd_pcm_wait() that tells us when enough room is free
> to commit another buffer, then we commit the previous buffer and make
> the next buffer ready.
>
> Since snd_pcm_wait() uses poll(), we don't have signals in winealsa any
> more.
>
>

This patch causes a hang in the interactive dsound tests:

bash$ cd wine-0.9.28-cvs-patch/dlls/dsound/tests
bash$ WINETEST_INTERACTIVE=1 wine dsound_test.exe.so dsound
...
fixme:wave:DBSB_MMAPStart Can't access sound driver's buffer directly.
ds3d.c:655: Test failed: The sound played for 835 ms instead of 1000 ms
dsound.c:602:  Testing a primary buffer at 48000x8x1 with a secondary
buffer at 11025x16x2
ds3d.c:447:    Playing 1 second 440Hz tone at 11025x16x2
fixme:wave:DBSB_MMAPStart Can't access sound driver's buffer directly.
fixme:wave:DBSB_MMAPStart Can't access sound driver's buffer directly.
fixme:wave:DBSB_MMAPStart Can't access sound driver's buffer directly.
ds3d.c:655: Test failed: The sound played for 371 ms instead of 1000 ms
dsound.c:602:  Testing a primary buffer at 48000x8x2 with a secondary
buffer at 11025x16x2
ds3d.c:447:    Playing 1 second 440Hz tone at 11025x16x2
fixme:wave:DBSB_MMAPStart Can't access sound driver's buffer directly.
fixme:wave:DBSB_MMAPStart Can't access sound driver's buffer directly.
ds3d.c:655: Test failed: The sound played for 834 ms instead of 1000 ms
dsound.c:602:  Testing a primary buffer at 48000x16x1 with a secondary
buffer at 11025x16x2
ds3d.c:447:    Playing 1 second 440Hz tone at 11025x16x2
fixme:wave:DBSB_MMAPStart Can't access sound driver's buffer directly.
fixme:wave:DBSB_MMAPStart Can't access sound driver's buffer directly.
ds3d.c:655: Test failed: The sound played for 767 ms instead of 1000 ms
dsound.c:602:  Testing a primary buffer at 48000x16x2 with a secondary
buffer at 11025x16x2
ds3d.c:447:    Playing 1 second 440Hz tone at 11025x16x2
fixme:wave:DBSB_MMAPStart Can't access sound driver's buffer directly.
dsound.c:602:  Testing a primary buffer at 96000x8x1 with a secondary
buffer at 11025x16x2
ds3d.c:447:    Playing 1 second 440Hz tone at 11025x16x2
fixme:wave:DBSB_MMAPStart Can't access sound driver's buffer directly.


(then silent hang)
kernel 2.6.19 wine 0.9.28 Fedora Core 5, snd_via82xx module