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29f0dcb563
* Finished Monty and Jani's merge * Some InnoDB tests still fail (because it's old xtradb code run against newer testsuite). They are expected to go after mergning with the latest xtradb.
119 lines
4.6 KiB
C
119 lines
4.6 KiB
C
/* Copyright 2000-2008 MySQL AB, 2008 Sun Microsystems, Inc.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; version 2 of the License.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */
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/* Dynamic hashing of record with different key-length */
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#ifndef _hash_h
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#define _hash_h
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#ifdef __cplusplus
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extern "C" {
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#endif
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/*
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There was a problem on MacOSX with a shared object ha_example.so.
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It used hash_search(). During build of ha_example.so no libmysys
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was specified. Since MacOSX had a hash_search() in the system
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library, it built the shared object so that the dynamic linker
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linked hash_search() to the system library, which caused a crash
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when called. To come around this, we renamed hash_search() to
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my_hash_search(), as we did long ago with hash_insert() and
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hash_reset(). However, this time we made the move complete with
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all names. To keep compatibility, we redefine the old names.
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Since every C and C++ file, that uses HASH, needs to include
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this file, the change is complete. Both names could be used
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in the code, but the my_* versions are recommended now.
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*/
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#define hash_get_key my_hash_get_key
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#define hash_free_key my_hash_free_key
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#define hash_init my_hash_init
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#define hash_init2 my_hash_init2
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#define _hash_init _my_hash_init
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#define hash_free my_hash_free
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#define hash_reset my_hash_reset
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#define hash_element my_hash_element
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#define hash_search my_hash_search
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#define hash_first my_hash_first
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#define hash_next my_hash_next
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#define hash_insert my_hash_insert
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#define hash_delete my_hash_delete
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#define hash_update my_hash_update
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#define hash_replace my_hash_replace
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#define hash_check my_hash_check
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#define hash_clear my_hash_clear
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#define hash_inited my_hash_inited
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#define hash_init_opt my_hash_init_opt
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/*
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Overhead to store an element in hash
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Can be used to approximate memory consumption for a hash
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*/
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#define HASH_OVERHEAD (sizeof(char*)*2)
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/* flags for hash_init */
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#define HASH_UNIQUE 1 /* hash_insert fails on duplicate key */
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typedef uchar *(*my_hash_get_key)(const uchar *,size_t*,my_bool);
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typedef void (*my_hash_free_key)(void *);
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typedef my_bool (*my_hash_walk_action)(void *,void *);
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typedef struct st_hash {
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size_t key_offset,key_length; /* Length of key if const length */
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size_t blength;
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ulong records;
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uint flags;
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DYNAMIC_ARRAY array; /* Place for hash_keys */
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my_hash_get_key get_key;
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void (*free)(void *);
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CHARSET_INFO *charset;
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} HASH;
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/* A search iterator state */
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typedef uint HASH_SEARCH_STATE;
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#define my_hash_init(A,B,C,D,E,F,G,H) \
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_my_hash_init(A,0,B,C,D,E,F,G,H CALLER_INFO)
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#define my_hash_init2(A,B,C,D,E,F,G,H,I) \
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_my_hash_init(A,B,C,D,E,F,G,H,I CALLER_INFO)
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my_bool _my_hash_init(HASH *hash, uint growth_size, CHARSET_INFO *charset,
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ulong default_array_elements, size_t key_offset,
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size_t key_length, my_hash_get_key get_key,
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void (*free_element)(void*),
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uint flags CALLER_INFO_PROTO);
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void my_hash_free(HASH *tree);
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void my_hash_reset(HASH *hash);
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uchar *my_hash_element(HASH *hash, ulong idx);
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uchar *my_hash_search(const HASH *info, const uchar *key, size_t length);
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uchar *my_hash_first(const HASH *info, const uchar *key, size_t length,
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HASH_SEARCH_STATE *state);
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uchar *my_hash_next(const HASH *info, const uchar *key, size_t length,
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HASH_SEARCH_STATE *state);
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my_bool my_hash_insert(HASH *info, const uchar *data);
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my_bool my_hash_delete(HASH *hash, uchar *record);
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my_bool my_hash_update(HASH *hash, uchar *record, uchar *old_key,
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size_t old_key_length);
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void my_hash_replace(HASH *hash, HASH_SEARCH_STATE *state, uchar *new_row);
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my_bool my_hash_check(HASH *hash); /* Only in debug library */
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my_bool my_hash_iterate(HASH *hash, my_hash_walk_action action, void *argument);
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#define my_hash_clear(H) bzero((char*) (H), sizeof(*(H)))
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#define my_hash_inited(H) ((H)->blength != 0)
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#define my_hash_init_opt(A,B,C,D,E,F,G,H) \
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(!my_hash_inited(A) && _my_hash_init(A,0,B,C,D,E,F,G, H CALLER_INFO))
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#ifdef __cplusplus
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}
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#endif
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#endif
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