/*****************************************************************************

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This program is free software; you can redistribute it and/or modify it under
the terms of the GNU General Public License, version 2.0, as published by the
Free Software Foundation.

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*****************************************************************************/

/** @file include/lock0lock.ic
 The transaction lock system

 Created 5/7/1996 Heikki Tuuri
 *******************************************************/

#include "btr0cur.h"
#include "buf0buf.h"
#include "dict0dict.h"
#include "log0recv.h"
#include "page0cur.h"
#include "page0page.h"
#include "que0que.h"
#include "read0read.h"
#include "row0row.h"
#include "row0vers.h"
#include "srv0srv.h"
#include "trx0sys.h"
#include "trx0trx.h"

/** Calculates the fold value of a page file address: used in inserting or
 searching for a lock in the hash table.
 @return folded value */
UNIV_INLINE
ulint lock_rec_fold(space_id_t space,  /*!< in: space */
                    page_no_t 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.
 @return hashed value */
UNIV_INLINE
ulint lock_rec_hash(space_id_t space,  /*!< in: space */
                    page_no_t page_no) /*!< in: page number */
{
  return (hash_calc_hash(lock_rec_fold(space, page_no), lock_sys->rec_hash));
}

/** Gets the heap_no of the smallest user record on a page.
 @return heap_no of smallest user record, or PAGE_HEAP_NO_SUPREMUM */
UNIV_INLINE
ulint lock_get_min_heap_no(const buf_block_t *block) /*!< in: buffer block */
{
  const page_t *page = block->frame;

  if (page_is_comp(page)) {
    return (rec_get_heap_no_new(
        page + rec_get_next_offs(page + PAGE_NEW_INFIMUM, TRUE)));
  } else {
    return (rec_get_heap_no_old(
        page + rec_get_next_offs(page + PAGE_OLD_INFIMUM, FALSE)));
  }
}

/** Get the lock hash table */
UNIV_INLINE
hash_table_t *lock_hash_get(ulint mode) /*!< in: lock mode */
{
  if (mode & LOCK_PREDICATE) {
    return (lock_sys->prdt_hash);
  } else if (mode & LOCK_PRDT_PAGE) {
    return (lock_sys->prdt_page_hash);
  } else {
    return (lock_sys->rec_hash);
  }
}