Log

Logs every action so we can redo changes if something crashes. More...

Macros
#define	LOG_SIZE   (2*1024*1024)

Enumerations
enum	log_type_t {   LOG_ENTRY_ADD = 0xaddadd , LOG_ENTRY_DEL = 0xde1e7e , LOG_ENTRY_WRAP = 0x123123 , LOG_ENTRY_INIT = 0x87654321 ,   LOG_ENTRY_BEGIN = 0x1 , LOG_ENTRY_END = 0x2 , LOG_ENTRY_WRITING = 0x3 , LOG_ENTRY_CHECKPOINT = 0x4 }

Functions
s4_log_data_t *	_log_create_data ()
void	_log_free_data (s4_log_data_t *data)
void	_log_checkpoint (s4_t *s4)
	Writes a checkpoint entry to the log, marking that the database has finished being written to disk.
int	_log_write (oplist_t *list)
	Writes all the operations in an oplist to disk.
int	_log_open (s4_t *s4)
	Opens a log file.
int	_log_close (s4_t *s4)
	Closes the log file.
void	_log_lock_file (s4_t *s4)
	Locks the log file.
void	_log_unlock_file (s4_t *s4)
	Unlocks the log file.
void	_log_lock_db (s4_t *s4)
	Locks the database file.
void	_log_unlock_db (s4_t *s4)
	Unlocks the database file.
log_number_t	_log_last_synced (s4_t *s4)
void	_log_init (s4_t *s4, log_number_t last_checkpoint)

Detailed Description

Logs every action so we can redo changes if something crashes.

Macro Definition Documentation

LOG_SIZE

#define LOG_SIZE   (2*1024*1024)

Referenced by _log_write().

Enumeration Type Documentation

log_type_t

enum log_type_t

Enumerator
LOG_ENTRY_ADD
LOG_ENTRY_DEL
LOG_ENTRY_WRAP
LOG_ENTRY_INIT
LOG_ENTRY_BEGIN
LOG_ENTRY_END
LOG_ENTRY_WRITING
LOG_ENTRY_CHECKPOINT

Function Documentation

_log_checkpoint()

void _log_checkpoint

(

s4_t *

s4

)

Writes a checkpoint entry to the log, marking that the database has finished being written to disk.

Parameters

s4	The database to write the log entry to.

_log_close()

int _log_close

(

s4_t *

s4

)

Closes the log file.

Parameters

s4	The database to close the logfile of.

Returns

0 on error, non-zero on success.

Referenced by s4_close().

_log_create_data()

s4_log_data_t * _log_create_data

(

void

)

_log_free_data()

void _log_free_data

(

s4_log_data_t *

data

)

_log_init()

void _log_init	(	s4_t *	s4,
		log_number_t	last_checkpoint )

_log_last_synced()

log_number_t _log_last_synced

(

s4_t *

s4

)

_log_lock_db()

void _log_lock_db

(

s4_t *

s4

)

Locks the database file.

This is actually a lock set on the log file.

Parameters

s4	The database to log.

_log_lock_file()

void _log_lock_file

(

s4_t *

s4

)

Locks the log file.

It will redo everything new in the log.

Parameters

s4	The database to lock the log of.

Referenced by s4_begin().

_log_open()

int _log_open

(

s4_t *

s4

)

Opens a log file.

Parameters

s4	The database to open the logfile for

Returns

0 on error, non-zero otherwise

Referenced by s4_open().

_log_unlock_db()

void _log_unlock_db

(

s4_t *

s4

)

Unlocks the database file.

Parameters

s4	The database to unlock.

_log_unlock_file()

void _log_unlock_file

(

s4_t *

s4

)

Unlocks the log file.

Parameters

s4	The database to unlock the log of.

Referenced by s4_commit().

_log_write()

int _log_write

(

oplist_t *

list

)

Writes all the operations in an oplist to disk.

Parameters

list	The oplist to write.

Returns

0 on error, non-zero on success.

Referenced by s4_commit().