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Added queue_empty()

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git-svn-id: svn://svn.rockbox.org/rockbox/trunk@658 a1c6a512-1295-4272-9138-f99709370657
This commit is contained in:
Björn Stenberg 2002-05-23 09:22:07 +00:00
parent 82e6a07298
commit 29f80283e9
2 changed files with 8 additions and 0 deletions
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5
firmware/kernel.c
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@ -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

3
firmware/kernel.h
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@ -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);