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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-05-04 18:07:14 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-05-04 18:07:14 +0000
commita175314c3e5827eb193872241446f2f8f5c9d33c (patch)
treecd3d60ca99ae00829c52a6ca79150a5b6e62528b /mysys/my_safehash.h
parentInitial commit. (diff)
downloadmariadb-10.5-a175314c3e5827eb193872241446f2f8f5c9d33c.tar.xz
mariadb-10.5-a175314c3e5827eb193872241446f2f8f5c9d33c.zip
Adding upstream version 1:10.5.12.upstream/1%10.5.12upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'mysys/my_safehash.h')
-rw-r--r--mysys/my_safehash.h56
1 files changed, 56 insertions, 0 deletions
diff --git a/mysys/my_safehash.h b/mysys/my_safehash.h
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+/* Copyright (C) 2003 MySQL AB
+
+ This program is free software; you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation; either version 2 of the License, or
+ (at your option) any later version.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program; if not, write to the Free Software
+ Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1335 USA */
+
+/*
+ Handling of multiple key caches
+
+ The idea is to have a thread safe hash on the table name,
+ with a default key cache value that is returned if the table name is not in
+ the cache.
+*/
+
+#include <hash.h>
+
+/*
+ Struct to store a key and pointer to object
+*/
+
+typedef struct st_safe_hash_entry
+{
+ uchar *key;
+ uint length;
+ uchar *data;
+ struct st_safe_hash_entry *next, **prev;
+} SAFE_HASH_ENTRY;
+
+
+typedef struct st_safe_hash_with_default
+{
+ mysql_rwlock_t mutex;
+ HASH hash;
+ uchar *default_value;
+ SAFE_HASH_ENTRY *root;
+} SAFE_HASH;
+
+
+my_bool safe_hash_init(SAFE_HASH *hash, uint elements,
+ uchar *default_value);
+void safe_hash_free(SAFE_HASH *hash);
+uchar *safe_hash_search(SAFE_HASH *hash, const uchar *key, uint length,
+ uchar *def);
+my_bool safe_hash_set(SAFE_HASH *hash, const uchar *key, uint length,
+ uchar *data);
+void safe_hash_change(SAFE_HASH *hash, uchar *old_data, uchar *new_data);