misc/emlog/emlog.h - diff

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version 1.3, 2001/03/01 09:27:47

version 1.4, 2001/08/13 08:10:18

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/************************ Private Definitions *****************************/

struct emlog_info {

unsigned long i_ino;

#if defined(DECLARE_WAIT_QUEUE_HEAD)

wait_queue_head_t read_q;

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struct wait_queue *read_q;

#endif

int refcount;

unsigned long i_ino; /* Inode number of this emlog buffer */

int read_point, write_point;

char *data; /* The circular buffer data */

int size;

int size; /* Size of the buffer pointed to by 'data' */

char *data;

int refcount; /* Files that have this buffer open */

int read_point; /* Offset in circ. buffer of oldest data */

int write_point; /* Offset in circ. buffer of newest data */

int offset; /* Byte number of read_point in the stream */

struct emlog_info *next;

};

#define EMLOG_EMPTY(einfo) (((einfo)->read_point) == ((einfo)->write_point))

#define EMLOG_SIZE(einfo) ( (einfo)->write_point >= (einfo)->read_point ? \

/* amount of data in the queue */

#define EMLOG_QLEN(einfo) ( (einfo)->write_point >= (einfo)->read_point ? \

(einfo)->write_point - (einfo)->read_point : \

(einfo)->size - (einfo)->read_point + (einfo)->write_point)

#define EMLOG_REFCOUNT(einfo) ((einfo)->refcount)

#define EMLOG_EMPTY(einfo) (((einfo)->read_point) == ((einfo)->write_point))

#define EMLOG_READQ(einfo) (&((einfo)->read_q))

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