ringblk_buf.h
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/*
* Copyright (c) 2006-2021, RT-Thread Development Team
*
* SPDX-License-Identifier: Apache-2.0
*
* Change Logs:
* Date Author Notes
* 2018-08-25 armink the first version
*/
#ifndef _RINGBLK_BUF_H_
#define _RINGBLK_BUF_H_
/*
* Introduction:
* The rbb is the ring buffer which is composed with many blocks. It is different from the ring buffer.
* The ring buffer is only composed with chars. The rbb put and get supported zero copies. So the rbb
* is very suitable for put block and get block by a certain order. Such as DMA block transmit,
* communicate frame send/recv, and so on.
*/
#ifdef __cplusplus
extern "C" {
#endif
enum rt_rbb_status
{
/* unused status when first initialize or after blk_free() */
RT_RBB_BLK_UNUSED,
/* initialized status after blk_alloc() */
RT_RBB_BLK_INITED,
/* put status after blk_put() */
RT_RBB_BLK_PUT,
/* get status after blk_get() */
RT_RBB_BLK_GET,
};
typedef enum rt_rbb_status rt_rbb_status_t;
/**
* the block of rbb
*/
struct rt_rbb_blk
{
rt_rbb_status_t status :8;
/* less then 2^24 */
rt_size_t size :24;
rt_uint8_t *buf;
rt_slist_t list;
};
typedef struct rt_rbb_blk *rt_rbb_blk_t;
/**
* Rbb block queue: the blocks (from block1->buf to blockn->buf) memory which on this queue is continuous.
*/
struct rt_rbb_blk_queue
{
rt_rbb_blk_t blocks;
rt_size_t blk_num;
};
typedef struct rt_rbb_blk_queue *rt_rbb_blk_queue_t;
/**
* ring block buffer
*/
struct rt_rbb
{
rt_uint8_t *buf;
rt_size_t buf_size;
/* all of blocks */
rt_rbb_blk_t blk_set;
rt_size_t blk_max_num;
/* saved the initialized and put status blocks */
rt_slist_t blk_list;
/* point to tail node */
rt_slist_t *tail;
/* free node list */
rt_slist_t free_list;
};
typedef struct rt_rbb *rt_rbb_t;
/* rbb (ring block buffer) API */
void rt_rbb_init(rt_rbb_t rbb, rt_uint8_t *buf, rt_size_t buf_size, rt_rbb_blk_t block_set, rt_size_t blk_max_num);
rt_size_t rt_rbb_get_buf_size(rt_rbb_t rbb);
#ifdef RT_USING_HEAP
rt_rbb_t rt_rbb_create(rt_size_t buf_size, rt_size_t blk_max_num);
void rt_rbb_destroy(rt_rbb_t rbb);
#endif
/* rbb block API */
rt_rbb_blk_t rt_rbb_blk_alloc(rt_rbb_t rbb, rt_size_t blk_size);
void rt_rbb_blk_put(rt_rbb_blk_t block);
rt_rbb_blk_t rt_rbb_blk_get(rt_rbb_t rbb);
rt_size_t rt_rbb_blk_size(rt_rbb_blk_t block);
rt_uint8_t *rt_rbb_blk_buf(rt_rbb_blk_t block);
void rt_rbb_blk_free(rt_rbb_t rbb, rt_rbb_blk_t block);
/* rbb block queue API */
rt_size_t rt_rbb_blk_queue_get(rt_rbb_t rbb, rt_size_t queue_data_len, rt_rbb_blk_queue_t blk_queue);
rt_size_t rt_rbb_blk_queue_len(rt_rbb_blk_queue_t blk_queue);
rt_uint8_t *rt_rbb_blk_queue_buf(rt_rbb_blk_queue_t blk_queue);
void rt_rbb_blk_queue_free(rt_rbb_t rbb, rt_rbb_blk_queue_t blk_queue);
rt_size_t rt_rbb_next_blk_queue_len(rt_rbb_t rbb);
#ifdef __cplusplus
}
#endif
#endif /* _RINGBLK_BUF_H_ */