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/*
+----------------------------------------------------------------------+
| Swoole |
+----------------------------------------------------------------------+
| This source file is subject to version 2.0 of the Apache license, |
| that is bundled with this package in the file LICENSE, and is |
| available through the world-wide-web at the following url: |
| http://www.apache.org/licenses/LICENSE-2.0.html |
| If you did not receive a copy of the Apache2.0 license and are unable|
| to obtain it through the world-wide-web, please send a note to |
| license@swoole.com so we can mail you a copy immediately. |
+----------------------------------------------------------------------+
| Author: Tianfeng Han <mikan.tenny@gmail.com> |
+----------------------------------------------------------------------+
*/
#ifndef _SW_RINGQUEUE_H_
#define _SW_RINGQUEUE_H_
typedef struct _swRingQueue
{
int head;
int tail;
/**
* empty or full
*/
int tag;
int size;
void **data;
} swRingQueue;
int swRingQueue_init(swRingQueue *queue, int buffer_size);
int swRingQueue_push(swRingQueue *queue, void *);
int swRingQueue_pop(swRingQueue *queue, void **);
void swRingQueue_free(swRingQueue *queue);
static inline int swRingQueue_count(swRingQueue *queue)
{
if (queue->tail > queue->head)
{
return queue->tail - queue->head;
}
else if (queue->head == queue->tail)
{
return queue->tag == 1 ? queue->size : 0;
}
else
{
return queue->tail + queue->size - queue->head;
}
}
#define swRingQueue_empty(q) ( (q->head == q->tail) && (q->tag == 0))
#define swRingQueue_full(q) ( (q->head == q->tail) && (q->tag == 1))
#endif