contents of written buffer - passed by snd_rawmidi_write() - atomically
to output ring buffer in the kernel space. This flag also means that device
is not opened exclusively, so more applications can share given rawmidi device.
+Note that applications must send the whole MIDI message including the running status,
+because another writting application might break the MIDI message in the output
+buffer.
\subsection rawmidi_open_sync Sync open (flag)