[Zynaddsubfx-user] JACK unzombiefication patch

[Lars L. <lar...@gm...>]

Here's a tiny patch that changes a pthread_mutex_lock() call in the JACK
process callback in Zyn to pthread_mutex_trylock() and fills the output
buffers with 0 samples if it can't acquire the mutex. It means that
instead of getting kicked from the JACK graph when the mutex is locked
(which happens quite often for me when loading instruments) you will get
a short audio glitch. Still not optimal, but getting rid of the glitch
altogether would require some redesigning.

The patch applies to Zyn 2.2.1 with the LASH + JACK MIDI patch. It does
not apply to unpatched Zyn 2.2.1.

http://sourceforge.net/tracker/index.php?func=3Ddetail&aid=3D1498438&group_=
id=3D62934&atid=3D502314

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