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