rt-thread/components/drivers/include/ipc/dataqueue.h

#ifndef DATAQUEUE_H__
#define DATAQUEUE_H__

#include <rtthread.h>

#define RT_DATAQUEUE_EVENT_UNKNOWN   0x00
#define RT_DATAQUEUE_EVENT_POP       0x01
#define RT_DATAQUEUE_EVENT_PUSH      0x02
#define RT_DATAQUEUE_EVENT_LWM       0x03

struct rt_data_item;
#define RT_DATAQUEUE_SIZE(dq)        ((dq)->put_index - (dq)->get_index)
#define RT_DATAQUEUE_EMPTY(dq)       ((dq)->size - RT_DATAQUEUE_SIZE(dq))
/* data queue implementation */
struct rt_data_queue
{
    rt_uint16_t size;
    rt_uint16_t lwm;
    rt_bool_t   waiting_lwm;

    rt_uint16_t get_index;
    rt_uint16_t put_index;

    struct rt_data_item *queue;

    rt_list_t suspended_push_list;
    rt_list_t suspended_pop_list;

    /* event notify */
    void (*evt_notify)(struct rt_data_queue *queue, rt_uint32_t event);
};

/**
 * DataQueue for DeviceDriver
 */
rt_err_t rt_data_queue_init(struct rt_data_queue *queue,
                            rt_uint16_t           size,
                            rt_uint16_t           lwm,
                            void (*evt_notify)(struct rt_data_queue *queue, rt_uint32_t event));
rt_err_t rt_data_queue_push(struct rt_data_queue *queue,
                            const void           *data_ptr,
                            rt_size_t             data_size,
                            rt_int32_t            timeout);
rt_err_t rt_data_queue_pop(struct rt_data_queue *queue,
                           const void          **data_ptr,
                           rt_size_t            *size,
                           rt_int32_t            timeout);
rt_err_t rt_data_queue_peak(struct rt_data_queue *queue,
                            const void          **data_ptr,
                            rt_size_t            *size);
void rt_data_queue_reset(struct rt_data_queue *queue);

#endif