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