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/******************************************************
Lock module internal structures and methods.
(c) 2007 Innobase Oy
Created July 12, 2007 Vasil Dimov
*******************************************************/
#ifndef lock0priv_h
#define lock0priv_h
#ifndef LOCK_MODULE_IMPLEMENTATION
/* If you need to access members of the structures defined in this
file, please write appropriate functions that retrieve them and put
those functions in lock/ */
#error Do not include lock0priv.h outside of the lock/ module
#endif
#include "univ.i"
#include "dict0types.h"
#include "hash0hash.h"
#include "trx0types.h"
#include "ut0lst.h"
/* A table lock */
typedef struct lock_table_struct lock_table_t;
struct lock_table_struct {
dict_table_t* table; /* database table in dictionary
cache */
UT_LIST_NODE_T(lock_t)
locks; /* list of locks on the same
table */
};
/* Record lock for a page */
typedef struct lock_rec_struct lock_rec_t;
struct lock_rec_struct {
ulint space; /* space id */
ulint page_no; /* page number */
ulint n_bits; /* number of bits in the lock
bitmap; NOTE: the lock bitmap is
placed immediately after the
lock struct */
};
/* Lock struct */
struct lock_struct {
trx_t* trx; /* transaction owning the
lock */
UT_LIST_NODE_T(lock_t)
trx_locks; /* list of the locks of the
transaction */
ulint type_mode; /* lock type, mode, LOCK_GAP or
LOCK_REC_NOT_GAP,
LOCK_INSERT_INTENTION,
wait flag, ORed */
hash_node_t hash; /* hash chain node for a record
lock */
dict_index_t* index; /* index for a record lock */
union {
lock_table_t tab_lock;/* table lock */
lock_rec_t rec_lock;/* record lock */
} un_member;
};
/*************************************************************************
Gets the type of a lock. */
UNIV_INLINE
ulint
lock_get_type(
/*==========*/
/* out: LOCK_TABLE or LOCK_REC */
const lock_t* lock); /* in: lock */
/**************************************************************************
Looks for a set bit in a record lock bitmap. Returns ULINT_UNDEFINED,
if none found. */
ulint
lock_rec_find_set_bit(
/*==================*/
/* out: bit index == heap number of the record, or
ULINT_UNDEFINED if none found */
lock_t* lock); /* in: record lock with at least one bit set */
/*************************************************************************
Gets the previous record lock set on a record. */
lock_t*
lock_rec_get_prev(
/*==============*/
/* out: previous lock on the same record, NULL if
none exists */
lock_t* in_lock,/* in: record lock */
ulint heap_no);/* in: heap number of the record */
#ifndef UNIV_NONINL
#include "lock0priv.ic"
#endif
#endif /* lock0priv_h */
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