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The original esdaudio.c file from upstream contains a nasty race condition
that can be triggered when the emulator exists while the audio record thread
is in a blocking read() call. In this case, exit() will end up calling
esd_fini_in which will try to pthread_join() the blocked thread, resulting
in a dead-lock.
This change just gets rid of the helper threads and just performs audio output
and input in the main event loop, avoiding blocking i/o completely. I haven't
experienced any difference compared to the original one, be it in audio lag
or CPU usage when playing a simple MP3 file in the emulated system.
The change also updates the update-audio.sh script since we don't store
our sources in p4 anymore. A small fix in common.sh deals removes an obsolete
special case that is not needed anymore when determining the location of the
host prebuilt binaries.
The version number is also bumped to 1.12 and CHANGES.TXT updated
accordingly.
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