Added queue_empty()

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@658 a1c6a512-1295-4272-9138-f99709370657

2 files changed, 8 insertions, 0 deletions

diff --git a/firmware/kernel.c b/firmware/kernel.c
index c6ac1fb7aa..639b73def5 100644
--- a/firmware/kernel.c
+++ b/firmware/kernel.c
@@ -94,6 +94,11 @@ void queue_post(struct event_queue *q, int id, void *data)
     set_irq_level(oldlevel);
 }
 
+bool queue_empty(struct event_queue* q)
+{
+    return ( q->read == q->write );
+}
+
 
 /****************************************************************************
  * Timer tick
diff --git a/firmware/kernel.h b/firmware/kernel.h
index cd5539b791..8f981b3753 100644
--- a/firmware/kernel.h
+++ b/firmware/kernel.h
@@ -19,6 +19,8 @@
 #ifndef _KERNEL_H_
 #define _KERNEL_H_
 
+#include <stdbool.h>
+
 /* wrap-safe macros for tick comparison */
 #define TIME_AFTER(a,b)         ((long)(b) - (long)(a) < 0)
 #define TIME_BEFORE(a,b)        TIME_AFTER(b,a)
@@ -60,6 +62,7 @@ int tick_remove_task(void (*f)(void));
 extern void queue_init(struct event_queue *q);
 extern void queue_wait(struct event_queue *q, struct event *ev);
 extern void queue_post(struct event_queue *q, int id, void *data);
+extern bool queue_empty(struct event_queue* q);
 
 extern void mutex_init(struct mutex *m);
 extern void mutex_lock(struct mutex *m);