tools: acrn-crashlog: event queue operations for acrnprobe

There is a global queue to receive all events detected. Genarally,
events are enqueued in channel, and dequeued in event handler.

Signed-off-by: Liu Xinwu <xinwu.liu@intel.com>
Reviewed-by: Zhang Yanmin <yanmin.zhang@intel.com>
Reviewed-by: Liu Chuansheng <chuansheng.liu@intel.com>
Reviewed-by: Zhao Yakui <yakui.zhao@intel.com>
Reviewed-by: Geoffroy Van Cutsem <geoffroy.vancutsem@intel.com>
Acked-by: Eddie Dong <Eddie.dong@intel.com>

tools/acrn-crashlog/acrnprobe/include/event_queue.h

@@ -33,6 +33,9 @@ struct event_t {
 	char path[0]; /* keep this at tail*/
 };
 
+void event_enqueue(struct event_t *event);
+int events_count(void);
+struct event_t *event_dequeue(void);
 void init_event_queue(void);
 
 #endif