lock0lock.ic
上传用户:romrleung
上传日期:2022-05-23
资源大小:18897k
文件大小:2k
- /******************************************************
- The transaction lock system
- (c) 1996 Innobase Oy
- Created 5/7/1996 Heikki Tuuri
- *******************************************************/
- #include "sync0sync.h"
- #include "srv0srv.h"
- #include "dict0dict.h"
- #include "row0row.h"
- #include "trx0sys.h"
- #include "trx0trx.h"
- #include "buf0buf.h"
- #include "page0page.h"
- #include "page0cur.h"
- #include "row0vers.h"
- #include "que0que.h"
- #include "btr0cur.h"
- #include "read0read.h"
- #include "log0recv.h"
- /*************************************************************************
- 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 */
- {
- return(ut_fold_ulint_pair(space, page_no));
- }
- /*************************************************************************
- 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 */
- {
- return(hash_calc_hash(lock_rec_fold(space, page_no),
- lock_sys->rec_hash));
- }
- /*************************************************************************
- Checks if some transaction has an implicit x-lock on a record in a clustered
- index. */
- UNIV_INLINE
- trx_t*
- lock_clust_rec_some_has_impl(
- /*=========================*/
- /* out: transaction which has the x-lock, or
- NULL */
- rec_t* rec, /* in: user record */
- dict_index_t* index) /* in: clustered index */
- {
- dulint trx_id;
- #ifdef UNIV_SYNC_DEBUG
- ut_ad(mutex_own(&kernel_mutex));
- #endif /* UNIV_SYNC_DEBUG */
- ut_ad(index->type & DICT_CLUSTERED);
- ut_ad(page_rec_is_user_rec(rec));
- trx_id = row_get_rec_trx_id(rec, index);
- if (trx_is_active(trx_id)) {
- /* The modifying or inserting transaction is active */
- return(trx_get_on_id(trx_id));
- }
- return(NULL);
- }