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/******************************************************
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;
ut_ad(mutex_own(&kernel_mutex));
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);
}
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