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1. We add a vector of locks to trx_t. This array contains the autoinc locks granted to a transaction. There is one per table. 2. We enforce releasing of these locks in the reverse order from the one in which they are acquired. The assumption is that since the AUTOINC locks are statement level locks. Nested statements introduced by triggers are stacked it should hold. There was some cleanup done to the vector code too by adding const and some new functions. Rename dict_table_t::auto_inc_lock to autoinc_lock. Fix Bug#26316 Triggers create duplicate entries on auto-increment columns rb://22
822 lines
29 KiB
C
822 lines
29 KiB
C
/******************************************************
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The transaction lock system
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(c) 1996 Innobase Oy
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Created 5/7/1996 Heikki Tuuri
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*******************************************************/
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#ifndef lock0lock_h
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#define lock0lock_h
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#include "univ.i"
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#include "buf0types.h"
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#include "trx0types.h"
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#include "rem0types.h"
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#include "dict0types.h"
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#include "que0types.h"
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#include "lock0types.h"
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#include "read0types.h"
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#include "hash0hash.h"
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#include "ut0vec.h"
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#ifdef UNIV_DEBUG
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extern ibool lock_print_waits;
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#endif /* UNIV_DEBUG */
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/* Buffer for storing information about the most recent deadlock error */
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extern FILE* lock_latest_err_file;
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/*************************************************************************
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Gets the size of a lock struct. */
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UNIV_INTERN
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ulint
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lock_get_size(void);
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/*===============*/
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/* out: size in bytes */
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/*************************************************************************
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Creates the lock system at database start. */
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UNIV_INTERN
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void
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lock_sys_create(
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/*============*/
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ulint n_cells); /* in: number of slots in lock hash table */
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/*************************************************************************
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Checks if some transaction has an implicit x-lock on a record in a clustered
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index. */
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UNIV_INLINE
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trx_t*
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lock_clust_rec_some_has_impl(
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/*=========================*/
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/* out: transaction which has the x-lock, or
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NULL */
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const rec_t* rec, /* in: user record */
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dict_index_t* index, /* in: clustered index */
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const ulint* offsets);/* in: rec_get_offsets(rec, index) */
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/*************************************************************************
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Gets the heap_no of the smallest user record on a page. */
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UNIV_INLINE
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ulint
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lock_get_min_heap_no(
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/*=================*/
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/* out: heap_no of smallest
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user record, or
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PAGE_HEAP_NO_SUPREMUM */
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const buf_block_t* block); /* in: buffer block */
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/*****************************************************************
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Updates the lock table when we have reorganized a page. NOTE: we copy
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also the locks set on the infimum of the page; the infimum may carry
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locks if an update of a record is occurring on the page, and its locks
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were temporarily stored on the infimum. */
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UNIV_INTERN
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void
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lock_move_reorganize_page(
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/*======================*/
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const buf_block_t* block, /* in: old index page, now
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reorganized */
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const buf_block_t* oblock);/* in: copy of the old, not
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reorganized page */
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/*****************************************************************
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Moves the explicit locks on user records to another page if a record
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list end is moved to another page. */
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UNIV_INTERN
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void
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lock_move_rec_list_end(
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/*===================*/
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const buf_block_t* new_block, /* in: index page to move to */
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const buf_block_t* block, /* in: index page */
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const rec_t* rec); /* in: record on page: this
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is the first record moved */
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/*****************************************************************
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Moves the explicit locks on user records to another page if a record
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list start is moved to another page. */
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UNIV_INTERN
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void
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lock_move_rec_list_start(
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/*=====================*/
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const buf_block_t* new_block, /* in: index page to move to */
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const buf_block_t* block, /* in: index page */
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const rec_t* rec, /* in: record on page:
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this is the first
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record NOT copied */
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const rec_t* old_end); /* in: old
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previous-to-last
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record on new_page
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before the records
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were copied */
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/*****************************************************************
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Updates the lock table when a page is split to the right. */
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UNIV_INTERN
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void
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lock_update_split_right(
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/*====================*/
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const buf_block_t* right_block, /* in: right page */
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const buf_block_t* left_block); /* in: left page */
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/*****************************************************************
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Updates the lock table when a page is merged to the right. */
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UNIV_INTERN
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void
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lock_update_merge_right(
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/*====================*/
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const buf_block_t* right_block, /* in: right page to
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which merged */
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const rec_t* orig_succ, /* in: original
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successor of infimum
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on the right page
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before merge */
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const buf_block_t* left_block); /* in: merged index
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page which will be
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discarded */
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/*****************************************************************
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Updates the lock table when the root page is copied to another in
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btr_root_raise_and_insert. Note that we leave lock structs on the
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root page, even though they do not make sense on other than leaf
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pages: the reason is that in a pessimistic update the infimum record
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of the root page will act as a dummy carrier of the locks of the record
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to be updated. */
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UNIV_INTERN
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void
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lock_update_root_raise(
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/*===================*/
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const buf_block_t* block, /* in: index page to which copied */
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const buf_block_t* root); /* in: root page */
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/*****************************************************************
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Updates the lock table when a page is copied to another and the original page
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is removed from the chain of leaf pages, except if page is the root! */
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UNIV_INTERN
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void
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lock_update_copy_and_discard(
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/*=========================*/
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const buf_block_t* new_block, /* in: index page to
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which copied */
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const buf_block_t* block); /* in: index page;
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NOT the root! */
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/*****************************************************************
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Updates the lock table when a page is split to the left. */
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UNIV_INTERN
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void
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lock_update_split_left(
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/*===================*/
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const buf_block_t* right_block, /* in: right page */
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const buf_block_t* left_block); /* in: left page */
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/*****************************************************************
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Updates the lock table when a page is merged to the left. */
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UNIV_INTERN
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void
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lock_update_merge_left(
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/*===================*/
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const buf_block_t* left_block, /* in: left page to
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which merged */
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const rec_t* orig_pred, /* in: original predecessor
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of supremum on the left page
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before merge */
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const buf_block_t* right_block); /* in: merged index page
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which will be discarded */
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/*****************************************************************
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Resets the original locks on heir and replaces them with gap type locks
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inherited from rec. */
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UNIV_INTERN
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void
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lock_rec_reset_and_inherit_gap_locks(
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/*=================================*/
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const buf_block_t* heir_block, /* in: block containing the
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record which inherits */
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const buf_block_t* block, /* in: block containing the
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record from which inherited;
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does NOT reset the locks on
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this record */
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ulint heir_heap_no, /* in: heap_no of the
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inheriting record */
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ulint heap_no); /* in: heap_no of the
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donating record */
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/*****************************************************************
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Updates the lock table when a page is discarded. */
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UNIV_INTERN
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void
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lock_update_discard(
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/*================*/
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const buf_block_t* heir_block, /* in: index page
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which will inherit the locks */
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ulint heir_heap_no, /* in: heap_no of the record
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which will inherit the locks */
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const buf_block_t* block); /* in: index page
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which will be discarded */
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/*****************************************************************
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Updates the lock table when a new user record is inserted. */
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UNIV_INTERN
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void
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lock_update_insert(
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/*===============*/
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const buf_block_t* block, /* in: buffer block containing rec */
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const rec_t* rec); /* in: the inserted record */
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/*****************************************************************
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Updates the lock table when a record is removed. */
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UNIV_INTERN
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void
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lock_update_delete(
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/*===============*/
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const buf_block_t* block, /* in: buffer block containing rec */
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const rec_t* rec); /* in: the record to be removed */
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/*************************************************************************
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Stores on the page infimum record the explicit locks of another record.
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This function is used to store the lock state of a record when it is
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updated and the size of the record changes in the update. The record
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is in such an update moved, perhaps to another page. The infimum record
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acts as a dummy carrier record, taking care of lock releases while the
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actual record is being moved. */
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UNIV_INTERN
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void
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lock_rec_store_on_page_infimum(
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/*===========================*/
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const buf_block_t* block, /* in: buffer block containing rec */
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const rec_t* rec); /* in: record whose lock state
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is stored on the infimum
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record of the same page; lock
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bits are reset on the
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record */
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/*************************************************************************
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Restores the state of explicit lock requests on a single record, where the
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state was stored on the infimum of the page. */
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UNIV_INTERN
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void
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lock_rec_restore_from_page_infimum(
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/*===============================*/
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const buf_block_t* block, /* in: buffer block containing rec */
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const rec_t* rec, /* in: record whose lock state
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is restored */
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const buf_block_t* donator);/* in: page (rec is not
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necessarily on this page)
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whose infimum stored the lock
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state; lock bits are reset on
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the infimum */
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/*************************************************************************
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Returns TRUE if there are explicit record locks on a page. */
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UNIV_INTERN
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ibool
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lock_rec_expl_exist_on_page(
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/*========================*/
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/* out: TRUE if there are explicit record locks on
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the page */
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ulint space, /* in: space id */
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ulint page_no);/* in: page number */
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/*************************************************************************
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Checks if locks of other transactions prevent an immediate insert of
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a record. If they do, first tests if the query thread should anyway
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be suspended for some reason; if not, then puts the transaction and
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the query thread to the lock wait state and inserts a waiting request
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for a gap x-lock to the lock queue. */
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UNIV_INTERN
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ulint
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lock_rec_insert_check_and_lock(
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/*===========================*/
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/* out: DB_SUCCESS, DB_LOCK_WAIT,
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DB_DEADLOCK, or DB_QUE_THR_SUSPENDED */
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ulint flags, /* in: if BTR_NO_LOCKING_FLAG bit is
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set, does nothing */
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rec_t* rec, /* in: record after which to insert */
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buf_block_t* block, /* in/out: buffer block of rec */
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dict_index_t* index, /* in: index */
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que_thr_t* thr, /* in: query thread */
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ibool* inherit);/* out: set to TRUE if the new
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inserted record maybe should inherit
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LOCK_GAP type locks from the successor
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record */
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/*************************************************************************
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Checks if locks of other transactions prevent an immediate modify (update,
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delete mark, or delete unmark) of a clustered index record. If they do,
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first tests if the query thread should anyway be suspended for some
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reason; if not, then puts the transaction and the query thread to the
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lock wait state and inserts a waiting request for a record x-lock to the
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lock queue. */
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UNIV_INTERN
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ulint
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lock_clust_rec_modify_check_and_lock(
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/*=================================*/
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/* out: DB_SUCCESS,
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DB_LOCK_WAIT, DB_DEADLOCK, or
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DB_QUE_THR_SUSPENDED */
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ulint flags, /* in: if BTR_NO_LOCKING_FLAG
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bit is set, does nothing */
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const buf_block_t* block, /* in: buffer block of rec */
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const rec_t* rec, /* in: record which should be
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modified */
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dict_index_t* index, /* in: clustered index */
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const ulint* offsets,/* in: rec_get_offsets(rec, index) */
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que_thr_t* thr); /* in: query thread */
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/*************************************************************************
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Checks if locks of other transactions prevent an immediate modify
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(delete mark or delete unmark) of a secondary index record. */
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UNIV_INTERN
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ulint
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lock_sec_rec_modify_check_and_lock(
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/*===============================*/
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/* out: DB_SUCCESS, DB_LOCK_WAIT,
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DB_DEADLOCK, or DB_QUE_THR_SUSPENDED */
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ulint flags, /* in: if BTR_NO_LOCKING_FLAG
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bit is set, does nothing */
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buf_block_t* block, /* in/out: buffer block of rec */
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rec_t* rec, /* in: record which should be
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modified; NOTE: as this is a secondary
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index, we always have to modify the
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clustered index record first: see the
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comment below */
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dict_index_t* index, /* in: secondary index */
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que_thr_t* thr); /* in: query thread */
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/*************************************************************************
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Like the counterpart for a clustered index below, but now we read a
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secondary index record. */
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UNIV_INTERN
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ulint
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lock_sec_rec_read_check_and_lock(
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/*=============================*/
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/* out: DB_SUCCESS,
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DB_LOCK_WAIT, DB_DEADLOCK, or
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DB_QUE_THR_SUSPENDED */
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ulint flags, /* in: if BTR_NO_LOCKING_FLAG
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bit is set, does nothing */
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const buf_block_t* block, /* in: buffer block of rec */
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const rec_t* rec, /* in: user record or page
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supremum record which should
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be read or passed over by a
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read cursor */
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dict_index_t* index, /* in: secondary index */
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const ulint* offsets,/* in: rec_get_offsets(rec, index) */
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enum lock_mode mode, /* in: mode of the lock which
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the read cursor should set on
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records: LOCK_S or LOCK_X; the
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latter is possible in
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SELECT FOR UPDATE */
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ulint gap_mode,/* in: LOCK_ORDINARY, LOCK_GAP, or
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LOCK_REC_NOT_GAP */
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que_thr_t* thr); /* in: query thread */
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/*************************************************************************
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Checks if locks of other transactions prevent an immediate read, or passing
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over by a read cursor, of a clustered index record. If they do, first tests
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if the query thread should anyway be suspended for some reason; if not, then
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puts the transaction and the query thread to the lock wait state and inserts a
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waiting request for a record lock to the lock queue. Sets the requested mode
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lock on the record. */
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UNIV_INTERN
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ulint
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lock_clust_rec_read_check_and_lock(
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/*===============================*/
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/* out: DB_SUCCESS,
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DB_LOCK_WAIT, DB_DEADLOCK, or
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DB_QUE_THR_SUSPENDED */
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ulint flags, /* in: if BTR_NO_LOCKING_FLAG
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bit is set, does nothing */
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const buf_block_t* block, /* in: buffer block of rec */
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const rec_t* rec, /* in: user record or page
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supremum record which should
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be read or passed over by a
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read cursor */
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dict_index_t* index, /* in: clustered index */
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const ulint* offsets,/* in: rec_get_offsets(rec, index) */
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enum lock_mode mode, /* in: mode of the lock which
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the read cursor should set on
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records: LOCK_S or LOCK_X; the
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latter is possible in
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SELECT FOR UPDATE */
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ulint gap_mode,/* in: LOCK_ORDINARY, LOCK_GAP, or
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LOCK_REC_NOT_GAP */
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que_thr_t* thr); /* in: query thread */
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/*************************************************************************
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Checks if locks of other transactions prevent an immediate read, or passing
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over by a read cursor, of a clustered index record. If they do, first tests
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if the query thread should anyway be suspended for some reason; if not, then
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puts the transaction and the query thread to the lock wait state and inserts a
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waiting request for a record lock to the lock queue. Sets the requested mode
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lock on the record. This is an alternative version of
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lock_clust_rec_read_check_and_lock() that does not require the parameter
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"offsets". */
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UNIV_INTERN
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ulint
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lock_clust_rec_read_check_and_lock_alt(
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/*===================================*/
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/* out: DB_SUCCESS,
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DB_LOCK_WAIT, DB_DEADLOCK, or
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DB_QUE_THR_SUSPENDED */
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ulint flags, /* in: if BTR_NO_LOCKING_FLAG
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bit is set, does nothing */
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const buf_block_t* block, /* in: buffer block of rec */
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const rec_t* rec, /* in: user record or page
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supremum record which should
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be read or passed over by a
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read cursor */
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dict_index_t* index, /* in: clustered index */
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enum lock_mode mode, /* in: mode of the lock which
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the read cursor should set on
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records: LOCK_S or LOCK_X; the
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latter is possible in
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SELECT FOR UPDATE */
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ulint gap_mode,/* in: LOCK_ORDINARY, LOCK_GAP, or
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LOCK_REC_NOT_GAP */
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que_thr_t* thr); /* in: query thread */
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/*************************************************************************
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Checks that a record is seen in a consistent read. */
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UNIV_INTERN
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ibool
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lock_clust_rec_cons_read_sees(
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/*==========================*/
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/* out: TRUE if sees, or FALSE if an earlier
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version of the record should be retrieved */
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const rec_t* rec, /* in: user record which should be read or
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passed over by a read cursor */
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dict_index_t* index, /* in: clustered index */
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const ulint* offsets,/* in: rec_get_offsets(rec, index) */
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read_view_t* view); /* in: consistent read view */
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/*************************************************************************
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Checks that a non-clustered index record is seen in a consistent read. */
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UNIV_INTERN
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ulint
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lock_sec_rec_cons_read_sees(
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/*========================*/
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/* out: TRUE if certainly
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sees, or FALSE if an earlier
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version of the clustered index
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record might be needed: NOTE
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that a non-clustered index
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page contains so little
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information on its
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modifications that also in the
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case FALSE, the present
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version of rec may be the
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right, but we must check this
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from the clustered index
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record */
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const rec_t* rec, /* in: user record which
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should be read or passed over
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by a read cursor */
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const read_view_t* view); /* in: consistent read view */
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/*************************************************************************
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Locks the specified database table in the mode given. If the lock cannot
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be granted immediately, the query thread is put to wait. */
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UNIV_INTERN
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ulint
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lock_table(
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/*=======*/
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/* out: DB_SUCCESS, DB_LOCK_WAIT,
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DB_DEADLOCK, or DB_QUE_THR_SUSPENDED */
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ulint flags, /* in: if BTR_NO_LOCKING_FLAG bit is set,
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does nothing */
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dict_table_t* table, /* in: database table in dictionary cache */
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enum lock_mode mode, /* in: lock mode */
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que_thr_t* thr); /* in: query thread */
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/*************************************************************************
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Checks if there are any locks set on the table. */
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UNIV_INTERN
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ibool
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lock_is_on_table(
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/*=============*/
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|
/* out: TRUE if there are lock(s) */
|
|
dict_table_t* table); /* in: database table in dictionary cache */
|
|
/*****************************************************************
|
|
Removes a granted record lock of a transaction from the queue and grants
|
|
locks to other transactions waiting in the queue if they now are entitled
|
|
to a lock. */
|
|
UNIV_INTERN
|
|
void
|
|
lock_rec_unlock(
|
|
/*============*/
|
|
trx_t* trx, /* in: transaction that has
|
|
set a record lock */
|
|
const buf_block_t* block, /* in: buffer block containing rec */
|
|
const rec_t* rec, /* in: record */
|
|
enum lock_mode lock_mode);/* in: LOCK_S or LOCK_X */
|
|
/*************************************************************************
|
|
Releases a table lock.
|
|
Releases possible other transactions waiting for this lock. */
|
|
UNIV_INTERN
|
|
void
|
|
lock_table_unlock(
|
|
/*==============*/
|
|
lock_t* lock); /* in: lock */
|
|
/*************************************************************************
|
|
Releases transaction locks, and releases possible other transactions waiting
|
|
because of these locks. */
|
|
UNIV_INTERN
|
|
void
|
|
lock_release_off_kernel(
|
|
/*====================*/
|
|
trx_t* trx); /* in: transaction */
|
|
/*************************************************************************
|
|
Cancels a waiting lock request and releases possible other transactions
|
|
waiting behind it. */
|
|
UNIV_INTERN
|
|
void
|
|
lock_cancel_waiting_and_release(
|
|
/*============================*/
|
|
lock_t* lock); /* in: waiting lock request */
|
|
|
|
/*************************************************************************
|
|
Removes locks on a table to be dropped or truncated.
|
|
If remove_also_table_sx_locks is TRUE then table-level S and X locks are
|
|
also removed in addition to other table-level and record-level locks.
|
|
No lock, that is going to be removed, is allowed to be a wait lock. */
|
|
UNIV_INTERN
|
|
void
|
|
lock_remove_all_on_table(
|
|
/*=====================*/
|
|
dict_table_t* table, /* in: table to be dropped
|
|
or truncated */
|
|
ibool remove_also_table_sx_locks);/* in: also removes
|
|
table S and X locks */
|
|
|
|
/*************************************************************************
|
|
Calculates the fold value of a page file address: used in inserting or
|
|
searching for a lock in the hash table. */
|
|
UNIV_INLINE
|
|
ulint
|
|
lock_rec_fold(
|
|
/*==========*/
|
|
/* out: folded value */
|
|
ulint space, /* in: space */
|
|
ulint page_no)/* in: page number */
|
|
__attribute__((const));
|
|
/*************************************************************************
|
|
Calculates the hash value of a page file address: used in inserting or
|
|
searching for a lock in the hash table. */
|
|
UNIV_INLINE
|
|
ulint
|
|
lock_rec_hash(
|
|
/*==========*/
|
|
/* out: hashed value */
|
|
ulint space, /* in: space */
|
|
ulint page_no);/* in: page number */
|
|
|
|
/**************************************************************************
|
|
Looks for a set bit in a record lock bitmap. Returns ULINT_UNDEFINED,
|
|
if none found. */
|
|
UNIV_INTERN
|
|
ulint
|
|
lock_rec_find_set_bit(
|
|
/*==================*/
|
|
/* out: bit index == heap number of
|
|
the record, or ULINT_UNDEFINED if none found */
|
|
const lock_t* lock); /* in: record lock with at least one bit set */
|
|
|
|
/*************************************************************************
|
|
Gets the source table of an ALTER TABLE transaction. The table must be
|
|
covered by an IX or IS table lock. */
|
|
UNIV_INTERN
|
|
dict_table_t*
|
|
lock_get_src_table(
|
|
/*===============*/
|
|
/* out: the source table of transaction,
|
|
if it is covered by an IX or IS table lock;
|
|
dest if there is no source table, and
|
|
NULL if the transaction is locking more than
|
|
two tables or an inconsistency is found */
|
|
trx_t* trx, /* in: transaction */
|
|
dict_table_t* dest, /* in: destination of ALTER TABLE */
|
|
enum lock_mode* mode); /* out: lock mode of the source table */
|
|
/*************************************************************************
|
|
Determine if the given table is exclusively "owned" by the given
|
|
transaction, i.e., transaction holds LOCK_IX and possibly LOCK_AUTO_INC
|
|
on the table. */
|
|
UNIV_INTERN
|
|
ibool
|
|
lock_is_table_exclusive(
|
|
/*====================*/
|
|
/* out: TRUE if table is only locked by trx,
|
|
with LOCK_IX, and possibly LOCK_AUTO_INC */
|
|
dict_table_t* table, /* in: table */
|
|
trx_t* trx); /* in: transaction */
|
|
/*************************************************************************
|
|
Checks if a lock request lock1 has to wait for request lock2. */
|
|
UNIV_INTERN
|
|
ibool
|
|
lock_has_to_wait(
|
|
/*=============*/
|
|
/* out: TRUE if lock1 has to wait for
|
|
lock2 to be removed */
|
|
const lock_t* lock1, /* in: waiting lock */
|
|
const lock_t* lock2); /* in: another lock; NOTE that it is
|
|
assumed that this has a lock bit set
|
|
on the same record as in lock1 if the
|
|
locks are record locks */
|
|
/*************************************************************************
|
|
Checks that a transaction id is sensible, i.e., not in the future. */
|
|
UNIV_INTERN
|
|
ibool
|
|
lock_check_trx_id_sanity(
|
|
/*=====================*/
|
|
/* out: TRUE if ok */
|
|
dulint trx_id, /* in: trx id */
|
|
const rec_t* rec, /* in: user record */
|
|
dict_index_t* index, /* in: clustered index */
|
|
const ulint* offsets, /* in: rec_get_offsets(rec, index) */
|
|
ibool has_kernel_mutex);/* in: TRUE if the caller owns the
|
|
kernel mutex */
|
|
/*************************************************************************
|
|
Prints info of a table lock. */
|
|
UNIV_INTERN
|
|
void
|
|
lock_table_print(
|
|
/*=============*/
|
|
FILE* file, /* in: file where to print */
|
|
const lock_t* lock); /* in: table type lock */
|
|
/*************************************************************************
|
|
Prints info of a record lock. */
|
|
UNIV_INTERN
|
|
void
|
|
lock_rec_print(
|
|
/*===========*/
|
|
FILE* file, /* in: file where to print */
|
|
const lock_t* lock); /* in: record type lock */
|
|
/*************************************************************************
|
|
Prints info of locks for all transactions. */
|
|
UNIV_INTERN
|
|
void
|
|
lock_print_info_summary(
|
|
/*====================*/
|
|
FILE* file); /* in: file where to print */
|
|
/*************************************************************************
|
|
Prints info of locks for each transaction. */
|
|
UNIV_INTERN
|
|
void
|
|
lock_print_info_all_transactions(
|
|
/*=============================*/
|
|
FILE* file); /* in: file where to print */
|
|
/*************************************************************************
|
|
Return approximate number or record locks (bits set in the bitmap) for
|
|
this transaction. Since delete-marked records may be removed, the
|
|
record count will not be precise. */
|
|
UNIV_INTERN
|
|
ulint
|
|
lock_number_of_rows_locked(
|
|
/*=======================*/
|
|
trx_t* trx); /* in: transaction */
|
|
/***********************************************************************
|
|
Release all the transaction's autoinc locks. */
|
|
UNIV_INTERN
|
|
void
|
|
lock_release_autoinc_locks(
|
|
/*=======================*/
|
|
trx_t* trx); /* in/out: transaction */
|
|
|
|
/***********************************************************************
|
|
Gets the type of a lock. Non-inline version for using outside of the
|
|
lock module. */
|
|
UNIV_INTERN
|
|
ulint
|
|
lock_get_type(
|
|
/*==========*/
|
|
/* out: LOCK_TABLE or LOCK_REC */
|
|
const lock_t* lock); /* in: lock */
|
|
|
|
/***********************************************************************
|
|
Gets the id of the transaction owning a lock. */
|
|
UNIV_INTERN
|
|
ullint
|
|
lock_get_trx_id(
|
|
/*============*/
|
|
/* out: transaction id */
|
|
const lock_t* lock); /* in: lock */
|
|
|
|
/***********************************************************************
|
|
Gets the mode of a lock in a human readable string.
|
|
The string should not be free()'d or modified. */
|
|
|
|
const char*
|
|
lock_get_mode_str(
|
|
/*==============*/
|
|
/* out: lock mode */
|
|
const lock_t* lock); /* in: lock */
|
|
|
|
/***********************************************************************
|
|
Gets the type of a lock in a human readable string.
|
|
The string should not be free()'d or modified. */
|
|
|
|
const char*
|
|
lock_get_type_str(
|
|
/*==============*/
|
|
/* out: lock type */
|
|
const lock_t* lock); /* in: lock */
|
|
|
|
/***********************************************************************
|
|
Gets the id of the table on which the lock is. */
|
|
UNIV_INTERN
|
|
ullint
|
|
lock_get_table_id(
|
|
/*==============*/
|
|
/* out: id of the table */
|
|
const lock_t* lock); /* in: lock */
|
|
|
|
/***********************************************************************
|
|
Gets the name of the table on which the lock is.
|
|
The string should not be free()'d or modified. */
|
|
|
|
const char*
|
|
lock_get_table_name(
|
|
/*================*/
|
|
/* out: name of the table */
|
|
const lock_t* lock); /* in: lock */
|
|
|
|
/***********************************************************************
|
|
For a record lock, gets the index on which the lock is. */
|
|
|
|
const dict_index_t*
|
|
lock_rec_get_index(
|
|
/*===============*/
|
|
/* out: index */
|
|
const lock_t* lock); /* in: lock */
|
|
|
|
/***********************************************************************
|
|
For a record lock, gets the name of the index on which the lock is.
|
|
The string should not be free()'d or modified. */
|
|
|
|
const char*
|
|
lock_rec_get_index_name(
|
|
/*====================*/
|
|
/* out: name of the index */
|
|
const lock_t* lock); /* in: lock */
|
|
|
|
/***********************************************************************
|
|
For a record lock, gets the tablespace number on which the lock is. */
|
|
UNIV_INTERN
|
|
ulint
|
|
lock_rec_get_space_id(
|
|
/*==================*/
|
|
/* out: tablespace number */
|
|
const lock_t* lock); /* in: lock */
|
|
|
|
/***********************************************************************
|
|
For a record lock, gets the page number on which the lock is. */
|
|
UNIV_INTERN
|
|
ulint
|
|
lock_rec_get_page_no(
|
|
/*=================*/
|
|
/* out: page number */
|
|
const lock_t* lock); /* in: lock */
|
|
|
|
/* Lock modes and types */
|
|
#define LOCK_MODE_MASK 0xFUL /* mask used to extract mode from the
|
|
type_mode field in a lock */
|
|
/* Lock types */
|
|
#define LOCK_TABLE 16 /* these type values should be so high that */
|
|
#define LOCK_REC 32 /* they can be ORed to the lock mode */
|
|
#define LOCK_TYPE_MASK 0xF0UL /* mask used to extract lock type from the
|
|
type_mode field in a lock */
|
|
/* Waiting lock flag */
|
|
#define LOCK_WAIT 256 /* this wait bit should be so high that
|
|
it can be ORed to the lock mode and type;
|
|
when this bit is set, it means that the
|
|
lock has not yet been granted, it is just
|
|
waiting for its turn in the wait queue */
|
|
/* Precise modes */
|
|
#define LOCK_ORDINARY 0 /* this flag denotes an ordinary next-key lock
|
|
in contrast to LOCK_GAP or LOCK_REC_NOT_GAP */
|
|
#define LOCK_GAP 512 /* this gap bit should be so high that
|
|
it can be ORed to the other flags;
|
|
when this bit is set, it means that the
|
|
lock holds only on the gap before the record;
|
|
for instance, an x-lock on the gap does not
|
|
give permission to modify the record on which
|
|
the bit is set; locks of this type are created
|
|
when records are removed from the index chain
|
|
of records */
|
|
#define LOCK_REC_NOT_GAP 1024 /* this bit means that the lock is only on
|
|
the index record and does NOT block inserts
|
|
to the gap before the index record; this is
|
|
used in the case when we retrieve a record
|
|
with a unique key, and is also used in
|
|
locking plain SELECTs (not part of UPDATE
|
|
or DELETE) when the user has set the READ
|
|
COMMITTED isolation level */
|
|
#define LOCK_INSERT_INTENTION 2048 /* this bit is set when we place a waiting
|
|
gap type record lock request in order to let
|
|
an insert of an index record to wait until
|
|
there are no conflicting locks by other
|
|
transactions on the gap; note that this flag
|
|
remains set when the waiting lock is granted,
|
|
or if the lock is inherited to a neighboring
|
|
record */
|
|
|
|
/* When lock bits are reset, the following flags are available: */
|
|
#define LOCK_RELEASE_WAIT 1
|
|
#define LOCK_NOT_RELEASE_WAIT 2
|
|
|
|
/* Lock operation struct */
|
|
typedef struct lock_op_struct lock_op_t;
|
|
struct lock_op_struct{
|
|
dict_table_t* table; /* table to be locked */
|
|
enum lock_mode mode; /* lock mode */
|
|
};
|
|
|
|
#define LOCK_OP_START 1
|
|
#define LOCK_OP_COMPLETE 2
|
|
|
|
/* The lock system struct */
|
|
struct lock_sys_struct{
|
|
hash_table_t* rec_hash; /* hash table of the record locks */
|
|
};
|
|
|
|
/* The lock system */
|
|
extern lock_sys_t* lock_sys;
|
|
|
|
|
|
#ifndef UNIV_NONINL
|
|
#include "lock0lock.ic"
|
|
#endif
|
|
|
|
#endif
|