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-rw-r--r--mysql/keycache.h156
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diff --git a/mysql/keycache.h b/mysql/keycache.h
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-/* Copyright (c) 2003, 2015, Oracle and/or its affiliates. All rights reserved.
-
- 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; version 2 of the License.
-
- 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 St, Fifth Floor, Boston, MA 02110-1301 USA */
-
-/* Key cache variable structures */
-
-#ifndef _keycache_h
-#define _keycache_h
-
-#include "my_sys.h" /* flush_type */
-
-C_MODE_START
-
-/* declare structures that is used by st_key_cache */
-
-struct st_block_link;
-typedef struct st_block_link BLOCK_LINK;
-struct st_hash_link;
-typedef struct st_hash_link HASH_LINK;
-
-/* Thread specific variables */
-typedef struct st_keycache_thread_var
-{
- mysql_cond_t suspend;
- struct st_keycache_thread_var *next,**prev;
- void *opt_info;
-} st_keycache_thread_var;
-
-/* info about requests in a waiting queue */
-typedef struct st_keycache_wqueue
-{
- st_keycache_thread_var *last_thread; /* circular list of waiting threads */
-} KEYCACHE_WQUEUE;
-
-#define CHANGED_BLOCKS_HASH 128 /* must be power of 2 */
-
-/*
- The key cache structure
- It also contains read-only statistics parameters.
-*/
-
-typedef struct st_key_cache
-{
- my_bool key_cache_inited;
- my_bool in_resize; /* true during resize operation */
- my_bool resize_in_flush; /* true during flush of resize operation */
- my_bool can_be_used; /* usage of cache for read/write is allowed */
- size_t key_cache_mem_size; /* specified size of the cache memory */
- uint key_cache_block_size; /* size of the page buffer of a cache block */
- ulonglong min_warm_blocks; /* min number of warm blocks; */
- ulonglong age_threshold; /* age threshold for hot blocks */
- ulonglong keycache_time; /* total number of block link operations */
- uint hash_entries; /* max number of entries in the hash table */
- int hash_links; /* max number of hash links */
- int hash_links_used; /* number of hash links currently used */
- int disk_blocks; /* max number of blocks in the cache */
- ulong blocks_used; /* maximum number of concurrently used blocks */
- ulong blocks_unused; /* number of currently unused blocks */
- ulong blocks_changed; /* number of currently dirty blocks */
- ulong warm_blocks; /* number of blocks in warm sub-chain */
- ulong cnt_for_resize_op; /* counter to block resize operation */
- long blocks_available; /* number of blocks available in the LRU chain */
- HASH_LINK **hash_root; /* arr. of entries into hash table buckets */
- HASH_LINK *hash_link_root; /* memory for hash table links */
- HASH_LINK *free_hash_list; /* list of free hash links */
- BLOCK_LINK *free_block_list; /* list of free blocks */
- BLOCK_LINK *block_root; /* memory for block links */
- uchar *block_mem; /* memory for block buffers */
- BLOCK_LINK *used_last; /* ptr to the last block of the LRU chain */
- BLOCK_LINK *used_ins; /* ptr to the insertion block in LRU chain */
- mysql_mutex_t cache_lock; /* to lock access to the cache structure */
- KEYCACHE_WQUEUE resize_queue; /* threads waiting during resize operation */
- /*
- Waiting for a zero resize count. Using a queue for symmetry though
- only one thread can wait here.
- */
- KEYCACHE_WQUEUE waiting_for_resize_cnt;
- KEYCACHE_WQUEUE waiting_for_hash_link; /* waiting for a free hash link */
- KEYCACHE_WQUEUE waiting_for_block; /* requests waiting for a free block */
- BLOCK_LINK *changed_blocks[CHANGED_BLOCKS_HASH]; /* hash for dirty file bl.*/
- BLOCK_LINK *file_blocks[CHANGED_BLOCKS_HASH]; /* hash for other file bl.*/
-
- /*
- The following variables are and variables used to hold parameters for
- initializing the key cache.
- */
-
- ulonglong param_buff_size; /* size the memory allocated for the cache */
- ulonglong param_block_size; /* size of the blocks in the key cache */
- ulonglong param_division_limit; /* min. percentage of warm blocks */
- ulonglong param_age_threshold; /* determines when hot block is downgraded */
-
- /* Statistics variables. These are reset in reset_key_cache_counters(). */
- ulong global_blocks_changed; /* number of currently dirty blocks */
- ulonglong global_cache_w_requests;/* number of write requests (write hits) */
- ulonglong global_cache_write; /* number of writes from cache to files */
- ulonglong global_cache_r_requests;/* number of read requests (read hits) */
- ulonglong global_cache_read; /* number of reads from files to cache */
-
- int blocks; /* max number of blocks in the cache */
- my_bool in_init; /* Set to 1 in MySQL during init/resize */
-} KEY_CACHE;
-
-/* The default key cache */
-extern KEY_CACHE dflt_key_cache_var, *dflt_key_cache;
-
-extern int init_key_cache(KEY_CACHE *keycache, ulonglong key_cache_block_size,
- size_t use_mem, ulonglong division_limit,
- ulonglong age_threshold);
-extern int resize_key_cache(KEY_CACHE *keycache,
- st_keycache_thread_var *thread_var,
- ulonglong key_cache_block_size,
- size_t use_mem, ulonglong division_limit,
- ulonglong age_threshold);
-extern uchar *key_cache_read(KEY_CACHE *keycache,
- st_keycache_thread_var *thread_var,
- File file, my_off_t filepos, int level,
- uchar *buff, uint length,
- uint block_length,int return_buffer);
-extern int key_cache_insert(KEY_CACHE *keycache,
- st_keycache_thread_var *thread_var,
- File file, my_off_t filepos, int level,
- uchar *buff, uint length);
-extern int key_cache_write(KEY_CACHE *keycache,
- st_keycache_thread_var *thread_var,
- File file, my_off_t filepos, int level,
- uchar *buff, uint length,
- uint block_length,int force_write);
-extern int flush_key_blocks(KEY_CACHE *keycache,
- st_keycache_thread_var *thread_var,
- int file, enum flush_type type);
-extern void end_key_cache(KEY_CACHE *keycache, my_bool cleanup);
-
-/* Functions to handle multiple key caches */
-extern my_bool multi_keycache_init(void);
-extern void multi_keycache_free(void);
-extern KEY_CACHE *multi_key_cache_search(uchar *key, uint length);
-extern my_bool multi_key_cache_set(const uchar *key, uint length,
- KEY_CACHE *key_cache);
-extern void multi_key_cache_change(KEY_CACHE *old_data,
- KEY_CACHE *new_data);
-extern int reset_key_cache_counters(const char *name,
- KEY_CACHE *key_cache);
-C_MODE_END
-#endif /* _keycache_h */