Current File : //usr/include/mysql/server/private/lf.h
/* Copyright (c) 2007, 2010, 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 02110-1335 USA */
#ifndef INCLUDE_LF_INCLUDED
#define INCLUDE_LF_INCLUDED
#include <my_atomic.h>
C_MODE_START
/*
wait-free dynamic array, see lf_dynarray.c
4 levels of 256 elements each mean 4311810304 elements in an array - it
should be enough for a while
*/
#define LF_DYNARRAY_LEVEL_LENGTH 256
#define LF_DYNARRAY_LEVELS 4
typedef struct {
void * volatile level[LF_DYNARRAY_LEVELS];
uint size_of_element;
} LF_DYNARRAY;
typedef int (*lf_dynarray_func)(void *, void *);
void lf_dynarray_init(LF_DYNARRAY *array, uint element_size);
void lf_dynarray_destroy(LF_DYNARRAY *array);
void *lf_dynarray_value(LF_DYNARRAY *array, uint idx);
void *lf_dynarray_lvalue(LF_DYNARRAY *array, uint idx);
int lf_dynarray_iterate(LF_DYNARRAY *array, lf_dynarray_func func, void *arg);
/*
pin manager for memory allocator, lf_alloc-pin.c
*/
#define LF_PINBOX_PINS 4
#define LF_PURGATORY_SIZE 100
typedef void lf_pinbox_free_func(void *, void *, void*);
typedef struct {
LF_DYNARRAY pinarray;
lf_pinbox_free_func *free_func;
void *free_func_arg;
uint free_ptr_offset;
uint32 volatile pinstack_top_ver; /* this is a versioned pointer */
uint32 volatile pins_in_array; /* number of elements in array */
} LF_PINBOX;
typedef struct {
void * volatile pin[LF_PINBOX_PINS];
LF_PINBOX *pinbox;
void *purgatory;
uint32 purgatory_count;
uint32 volatile link;
/* avoid false sharing */
char pad[CPU_LEVEL1_DCACHE_LINESIZE];
} LF_PINS;
/* compile-time assert to make sure we have enough pins. */
#define lf_pin(PINS, PIN, ADDR) \
do { \
compile_time_assert(PIN < LF_PINBOX_PINS); \
my_atomic_storeptr(&(PINS)->pin[PIN], (ADDR)); \
} while(0)
#define lf_unpin(PINS, PIN) lf_pin(PINS, PIN, NULL)
#define lf_assert_pin(PINS, PIN) assert((PINS)->pin[PIN] != 0)
#define lf_assert_unpin(PINS, PIN) assert((PINS)->pin[PIN] == 0)
void lf_pinbox_init(LF_PINBOX *pinbox, uint free_ptr_offset,
lf_pinbox_free_func *free_func, void * free_func_arg);
void lf_pinbox_destroy(LF_PINBOX *pinbox);
LF_PINS *lf_pinbox_get_pins(LF_PINBOX *pinbox);
void lf_pinbox_put_pins(LF_PINS *pins);
void lf_pinbox_free(LF_PINS *pins, void *addr);
/*
memory allocator, lf_alloc-pin.c
*/
typedef struct st_lf_allocator {
LF_PINBOX pinbox;
uchar * volatile top;
uint element_size;
uint32 volatile mallocs;
void (*constructor)(uchar *); /* called, when an object is malloc()'ed */
void (*destructor)(uchar *); /* called, when an object is free()'d */
} LF_ALLOCATOR;
void lf_alloc_init(LF_ALLOCATOR *allocator, uint size, uint free_ptr_offset);
void lf_alloc_destroy(LF_ALLOCATOR *allocator);
uint lf_alloc_pool_count(LF_ALLOCATOR *allocator);
/*
shortcut macros to access underlying pinbox functions from an LF_ALLOCATOR
see lf_pinbox_get_pins() and lf_pinbox_put_pins()
*/
#define lf_alloc_free(PINS, PTR) lf_pinbox_free((PINS), (PTR))
#define lf_alloc_get_pins(A) lf_pinbox_get_pins(&(A)->pinbox)
#define lf_alloc_put_pins(PINS) lf_pinbox_put_pins(PINS)
#define lf_alloc_direct_free(ALLOC, ADDR) \
do { \
if ((ALLOC)->destructor) \
(ALLOC)->destructor((uchar*) ADDR); \
my_free(ADDR); \
} while(0)
void *lf_alloc_new(LF_PINS *pins);
C_MODE_END
/*
extendible hash, lf_hash.cc
*/
#include <hash.h>
C_MODE_START
typedef struct st_lf_hash LF_HASH;
typedef void (*lf_hash_initializer)(LF_HASH *hash, void *dst, const void *src);
#define LF_HASH_UNIQUE 1
/* lf_hash overhead per element (that is, sizeof(LF_SLIST) */
extern const int LF_HASH_OVERHEAD;
struct st_lf_hash {
LF_DYNARRAY array; /* hash itself */
LF_ALLOCATOR alloc; /* allocator for elements */
my_hash_get_key get_key; /* see HASH */
lf_hash_initializer initializer; /* called when an element is inserted */
my_hash_function hash_function; /* see HASH */
CHARSET_INFO *charset; /* see HASH */
uint key_offset, key_length; /* see HASH */
uint element_size; /* size of memcpy'ed area on insert */
uint flags; /* LF_HASH_UNIQUE, etc */
int32 volatile size; /* size of array */
int32 volatile count; /* number of elements in the hash */
};
void lf_hash_init(LF_HASH *hash, uint element_size, uint flags,
uint key_offset, uint key_length, my_hash_get_key get_key,
CHARSET_INFO *charset);
void lf_hash_destroy(LF_HASH *hash);
int lf_hash_insert(LF_HASH *hash, LF_PINS *pins, const void *data);
void *lf_hash_search(LF_HASH *hash, LF_PINS *pins, const void *key, uint keylen);
void *lf_hash_search_using_hash_value(LF_HASH *hash, LF_PINS *pins,
my_hash_value_type hash_value,
const void *key, uint keylen);
int lf_hash_delete(LF_HASH *hash, LF_PINS *pins, const void *key, uint keylen);
int lf_hash_iterate(LF_HASH *hash, LF_PINS *pins,
my_hash_walk_action action, void *argument);
#define lf_hash_size(hash) \
my_atomic_load32_explicit(&(hash)->count, MY_MEMORY_ORDER_RELAXED)
/*
shortcut macros to access underlying pinbox functions from an LF_HASH
see lf_pinbox_get_pins() and lf_pinbox_put_pins()
*/
#define lf_hash_get_pins(HASH) lf_alloc_get_pins(&(HASH)->alloc)
#define lf_hash_put_pins(PINS) lf_pinbox_put_pins(PINS)
#define lf_hash_search_unpin(PINS) lf_unpin((PINS), 2)
/*
cleanup
*/
C_MODE_END
#endif
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