#ifndef _MESA_SHM_RING_QUEUE_H_
#define _MESA_SHM_RING_QUEUE_H_
#include <pthread.h>
#define MESA_SHM_RING_QUEUE_NUM 128
#define MESA_SHM_RING_QUEUE_BLOCK_NUM 8192
#define MESA_SHM_RING_QUEUE_BLOCK_BUFLEN 4096
#define MESA_SHM_RING_QUEUE_BLOCK_SIZE (MESA_SHM_RING_QUEUE_BLOCK_BUFLEN + sizeof(int) + 1) /*user buf + (int)len flag + '\n'*/
#define MESA_SHM_KEY_OVERVIEW 35720
#define MESA_SHM_KEY_MIN (MESA_SHM_KEY_OVERVIEW + 1)
#define MESA_SHM_KEY_MAX (MESA_SHM_KEY_MIN + MESA_SHM_RING_QUEUE_NUM -1)
#define MESA_SHM_RING_QUEUE_INITIAL 0
#define MESA_SHM_RING_QUEUE_IDLE 1
#define MESA_SHM_RING_QUEUE_HALF_IDLE 2
#define MESA_SHM_RING_QUEUE_USED 3
struct MESA_shm_overview *MESA_shm_alloc_overview();
struct MESA_shm_queue_head *MESA_shm_get_ring_queue();
void MESA_shm_init_mutex();
void MESA_shm_init_overview();
void MESA_shm_recycle_ring_queue(struct MESA_shm_queue_head *ring_queue_head);
int MESA_shm_copy_buf_to_ring_queue(char *buf, int buflen, struct MESA_shm_queue_head *head);
void MESA_shm_write_ring_queue_to_file(int fd, struct MESA_shm_queue_head *head);
struct MESA_shm_overview{
int shmkey;
int shmid;
int idx;
pthread_mutex_t mutex;
};
struct MESA_shm_queue_head{
unsigned int blksize;
unsigned int blknum;
volatile unsigned int rd_idx;
volatile unsigned int wr_idx;
int ovw_idx;
#endif
