log0log.h

这是linux下运行的mysql软件包,可用于linux 下安装 php + mysql + apach 的网络配置

ulint
log_archive_start(void);
/*===================*/
			/* out: DB_SUCCESS or DB_ERROR */
/********************************************************************
Stop archiving the log so that a gap may occur in the archived log files. */

ulint
log_archive_noarchivelog(void);
/*==========================*/
			/* out: DB_SUCCESS or DB_ERROR */
/********************************************************************
Start archiving the log so that a gap may occur in the archived log files. */

ulint
log_archive_archivelog(void);
/*========================*/
			/* out: DB_SUCCESS or DB_ERROR */
/**********************************************************
Generates an archived log file name. */

void
log_archived_file_name_gen(
/*=======================*/
	char*	buf,	/* in: buffer where to write */
	ulint	id,	/* in: group id */
	ulint	file_no);/* in: file number */
/************************************************************************
Checks that there is enough free space in the log to start a new query step.
Flushes the log buffer or makes a new checkpoint if necessary. NOTE: this
function may only be called if the calling thread owns no synchronization
objects! */

void
log_check_margins(void);
/*===================*/
/**********************************************************
Reads a specified log segment to a buffer. */

void
log_group_read_log_seg(
/*===================*/
	ulint		type,		/* in: LOG_ARCHIVE or LOG_RECOVER */
	byte*		buf,		/* in: buffer where to read */
	log_group_t*	group,		/* in: log group */
	dulint		start_lsn,	/* in: read area start */
	dulint		end_lsn);	/* in: read area end */
/**********************************************************
Writes a buffer to a log file group. */

void
log_group_write_buf(
/*================*/
	log_group_t*	group,		/* in: log group */
	byte*		buf,		/* in: buffer */
	ulint		len,		/* in: buffer len; must be divisible
					by OS_FILE_LOG_BLOCK_SIZE */
	dulint		start_lsn,	/* in: start lsn of the buffer; must
					be divisible by
					OS_FILE_LOG_BLOCK_SIZE */
	ulint		new_data_offset);/* in: start offset of new data in
					buf: this parameter is used to decide
					if we have to write a new log file
					header */
/************************************************************
Sets the field values in group to correspond to a given lsn. For this function
to work, the values must already be correctly initialized to correspond to
some lsn, for instance, a checkpoint lsn. */

void
log_group_set_fields(
/*=================*/
	log_group_t*	group,	/* in: group */
	dulint		lsn);	/* in: lsn for which the values should be
				set */
/**********************************************************
Calculates the data capacity of a log group, when the log file headers are not
included. */

ulint
log_group_get_capacity(
/*===================*/
				/* out: capacity in bytes */
	log_group_t*	group);	/* in: log group */
/****************************************************************
Gets a log block flush bit. */
UNIV_INLINE
ibool
log_block_get_flush_bit(
/*====================*/
				/* out: TRUE if this block was the first
				to be written in a log flush */
	byte*	log_block);	/* in: log block */
/****************************************************************
Gets a log block number stored in the header. */
UNIV_INLINE
ulint
log_block_get_hdr_no(
/*=================*/
				/* out: log block number stored in the block
				header */
	byte*	log_block);	/* in: log block */
/****************************************************************
Gets a log block data length. */
UNIV_INLINE
ulint
log_block_get_data_len(
/*===================*/
				/* out: log block data length measured as a
				byte offset from the block start */
	byte*	log_block);	/* in: log block */
/****************************************************************
Sets the log block data length. */
UNIV_INLINE
void
log_block_set_data_len(
/*===================*/
	byte*	log_block,	/* in: log block */
	ulint	len);		/* in: data length */
/****************************************************************
Calculates the checksum for a log block. */
UNIV_INLINE
ulint
log_block_calc_checksum(
/*====================*/
			/* out: checksum */
	byte*	block);	/* in: log block */
/****************************************************************
Gets a log block checksum field value. */
UNIV_INLINE
ulint
log_block_get_checksum(
/*===================*/
				/* out: checksum */
	byte*	log_block);	/* in: log block */
/****************************************************************
Sets a log block checksum field value. */
UNIV_INLINE
void
log_block_set_checksum(
/*===================*/
	byte*	log_block,	/* in: log block */
	ulint	checksum);	/* in: checksum */
/****************************************************************
Gets a log block first mtr log record group offset. */
UNIV_INLINE
ulint
log_block_get_first_rec_group(
/*==========================*/
				/* out: first mtr log record group byte offset
				from the block start, 0 if none */
	byte*	log_block);	/* in: log block */
/****************************************************************
Sets the log block first mtr log record group offset. */
UNIV_INLINE
void
log_block_set_first_rec_group(
/*==========================*/
	byte*	log_block,	/* in: log block */
	ulint	offset);	/* in: offset, 0 if none */
/****************************************************************
Gets a log block checkpoint number field (4 lowest bytes). */
UNIV_INLINE
ulint
log_block_get_checkpoint_no(
/*========================*/
				/* out: checkpoint no (4 lowest bytes) */
	byte*	log_block);	/* in: log block */
/****************************************************************
Initializes a log block in the log buffer. */
UNIV_INLINE
void
log_block_init(
/*===========*/
	byte*	log_block,	/* in: pointer to the log buffer */
	dulint	lsn);		/* in: lsn within the log block */
/****************************************************************
Initializes a log block in the log buffer in the old, < 3.23.52 format, where
there was no checksum yet. */
UNIV_INLINE
void
log_block_init_in_old_format(
/*=========================*/
	byte*	log_block,	/* in: pointer to the log buffer */
	dulint	lsn);		/* in: lsn within the log block */
/****************************************************************
Converts a lsn to a log block number. */
UNIV_INLINE
ulint
log_block_convert_lsn_to_no(
/*========================*/
			/* out: log block number, it is > 0 and <= 1G */
	dulint	lsn);	/* in: lsn of a byte within the block */
/**********************************************************
Prints info of the log. */

void
log_print(
/*======*/
	FILE*	file);	/* in: file where to print */
/**********************************************************
Peeks the current lsn. */

ibool
log_peek_lsn(
/*=========*/
                       /* out: TRUE if success, FALSE if could not get the
                       log system mutex */
       dulint* lsn);   /* out: if returns TRUE, current lsn is here */
/**************************************************************************
Refreshes the statistics used to print per-second averages. */

void
log_refresh_stats(void);
/*===================*/

extern log_t*	log_sys;

/* Values used as flags */
#define LOG_FLUSH	7652559
#define LOG_CHECKPOINT	78656949
#define LOG_ARCHIVE	11122331
#define LOG_RECOVER	98887331

/* The counting of lsn's starts from this value: this must be non-zero */
#define LOG_START_LSN	ut_dulint_create(0, 16 * OS_FILE_LOG_BLOCK_SIZE)

#define LOG_BUFFER_SIZE 	(srv_log_buffer_size * UNIV_PAGE_SIZE)
#define LOG_ARCHIVE_BUF_SIZE	(srv_log_buffer_size * UNIV_PAGE_SIZE / 4)

/* Offsets of a log block header */
#define	LOG_BLOCK_HDR_NO	0	/* block number which must be > 0 and
					is allowed to wrap around at 2G; the
					highest bit is set to 1 if this is the
					first log block in a log flush write
					segment */
#define LOG_BLOCK_FLUSH_BIT_MASK 0x80000000UL
					/* mask used to get the highest bit in
					the preceding field */
#define	LOG_BLOCK_HDR_DATA_LEN	4	/* number of bytes of log written to
					this block */
#define	LOG_BLOCK_FIRST_REC_GROUP 6	/* offset of the first start of an
					mtr log record group in this log block,
					0 if none; if the value is the same
					as LOG_BLOCK_HDR_DATA_LEN, it means
					that the first rec group has not yet
					been catenated to this log block, but
					if it will, it will start at this
					offset; an archive recovery can
					start parsing the log records starting
					from this offset in this log block,
					if value not 0 */
#define LOG_BLOCK_CHECKPOINT_NO	8	/* 4 lower bytes of the value of
					log_sys->next_checkpoint_no when the
					log block was last written to: if the
					block has not yet been written full,
					this value is only updated before a
					log buffer flush */
#define LOG_BLOCK_HDR_SIZE	12	/* size of the log block header in
					bytes */

/* Offsets of a log block trailer from the end of the block */
#define	LOG_BLOCK_CHECKSUM	4	/* 4 byte checksum of the log block
					contents; in InnoDB versions
					< 3.23.52 this did not contain the
					checksum but the same value as
					.._HDR_NO */
#define	LOG_BLOCK_TRL_SIZE	4	/* trailer size in bytes */

/* Offsets for a checkpoint field */
#define LOG_CHECKPOINT_NO		0
#define LOG_CHECKPOINT_LSN		8
#define LOG_CHECKPOINT_OFFSET		16
#define LOG_CHECKPOINT_LOG_BUF_SIZE	20
#define	LOG_CHECKPOINT_ARCHIVED_LSN	24
#define	LOG_CHECKPOINT_GROUP_ARRAY	32

/* For each value < LOG_MAX_N_GROUPS the following 8 bytes: */

#define LOG_CHECKPOINT_ARCHIVED_FILE_NO	0
#define LOG_CHECKPOINT_ARCHIVED_OFFSET	4

#define	LOG_CHECKPOINT_ARRAY_END	(LOG_CHECKPOINT_GROUP_ARRAY\
							+ LOG_MAX_N_GROUPS * 8)
#define LOG_CHECKPOINT_CHECKSUM_1 	LOG_CHECKPOINT_ARRAY_END
#define LOG_CHECKPOINT_CHECKSUM_2 	(4 + LOG_CHECKPOINT_ARRAY_END)
#define LOG_CHECKPOINT_FSP_FREE_LIMIT	(8 + LOG_CHECKPOINT_ARRAY_END)
					/* current fsp free limit in
					tablespace 0, in units of one