*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; version 2 of the License
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
#define ao_monitor_ring_next(n) (((n) + 1) & (AO_MONITOR_RING - 1))
#define ao_monitor_ring_prev(n) (((n) - 1) & (AO_MONITOR_RING - 1))
+extern __data uint8_t ao_monitoring_mutex;
extern __data uint8_t ao_monitoring;
extern __data uint8_t ao_monitor_head;