From 354bb40e75d94466e91fe6960523612c9d17ccfb Mon Sep 17 00:00:00 2001 From: Karen Arutyunov Date: Thu, 2 Nov 2017 23:11:29 +0300 Subject: Add implementation --- mysql/my_bitmap.h | 144 ++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 144 insertions(+) create mode 100644 mysql/my_bitmap.h (limited to 'mysql/my_bitmap.h') diff --git a/mysql/my_bitmap.h b/mysql/my_bitmap.h new file mode 100644 index 0000000..f45c1bc --- /dev/null +++ b/mysql/my_bitmap.h @@ -0,0 +1,144 @@ +/* + Copyright (c) 2001, 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 Street, Fifth Floor, Boston, MA 02110-1301, USA */ + +#ifndef _my_bitmap_h_ +#define _my_bitmap_h_ + +#define MY_BIT_NONE (~(uint) 0) + +#include +#include "mysql/psi/mysql_thread.h" /* mysql_mutex_t */ + +typedef uint32 my_bitmap_map; + +typedef struct st_bitmap +{ + my_bitmap_map *bitmap; + uint n_bits; /* number of bits occupied by the above */ + my_bitmap_map last_word_mask; + my_bitmap_map *last_word_ptr; + /* + mutex will be acquired for the duration of each bitmap operation if + thread_safe flag in bitmap_init was set. Otherwise, we optimize by not + acquiring the mutex + */ + mysql_mutex_t *mutex; +} MY_BITMAP; + +#ifdef __cplusplus +extern "C" { +#endif +extern void create_last_word_mask(MY_BITMAP *map); +extern my_bool bitmap_init(MY_BITMAP *map, my_bitmap_map *buf, uint n_bits, + my_bool thread_safe); +extern my_bool bitmap_is_clear_all(const MY_BITMAP *map); +extern my_bool bitmap_is_prefix(const MY_BITMAP *map, uint prefix_size); +extern my_bool bitmap_is_set_all(const MY_BITMAP *map); +extern my_bool bitmap_is_subset(const MY_BITMAP *map1, const MY_BITMAP *map2); +extern my_bool bitmap_is_overlapping(const MY_BITMAP *map1, + const MY_BITMAP *map2); +extern my_bool bitmap_test_and_set(MY_BITMAP *map, uint bitmap_bit); +extern my_bool bitmap_test_and_clear(MY_BITMAP *map, uint bitmap_bit); +extern my_bool bitmap_fast_test_and_set(MY_BITMAP *map, uint bitmap_bit); +extern uint bitmap_set_next(MY_BITMAP *map); +extern uint bitmap_get_first(const MY_BITMAP *map); +extern uint bitmap_get_first_set(const MY_BITMAP *map); +extern uint bitmap_get_next_set(const MY_BITMAP *map, uint bitmap_bit); +extern uint bitmap_bits_set(const MY_BITMAP *map); +extern void bitmap_free(MY_BITMAP *map); +extern void bitmap_set_above(MY_BITMAP *map, uint from_byte, uint use_bit); +extern void bitmap_set_prefix(MY_BITMAP *map, uint prefix_size); +extern void bitmap_intersect(MY_BITMAP *map, const MY_BITMAP *map2); +extern void bitmap_subtract(MY_BITMAP *map, const MY_BITMAP *map2); +extern void bitmap_union(MY_BITMAP *map, const MY_BITMAP *map2); +extern void bitmap_xor(MY_BITMAP *map, const MY_BITMAP *map2); +extern void bitmap_invert(MY_BITMAP *map); +extern void bitmap_copy(MY_BITMAP *map, const MY_BITMAP *map2); + +extern uint bitmap_lock_set_next(MY_BITMAP *map); +extern void bitmap_lock_clear_bit(MY_BITMAP *map, uint bitmap_bit); +/* Fast, not thread safe, bitmap functions */ +#define bitmap_buffer_size(bits) (((bits)+31)/32)*4 +#define no_bytes_in_map(map) (((map)->n_bits + 7)/8) +#define no_words_in_map(map) (((map)->n_bits + 31)/32) + +static inline void bitmap_set_bit(MY_BITMAP *map, uint bit) +{ + DBUG_ASSERT(bit < map->n_bits); + ((uchar*)map->bitmap)[bit / 8] |= (1 << (bit & 7)); +} + + +static inline void bitmap_flip_bit(MY_BITMAP *map, uint bit) +{ + DBUG_ASSERT(bit < map->n_bits); + ((uchar*)map->bitmap)[bit / 8] ^= (1 << (bit & 7)); +} + + +static inline void bitmap_clear_bit(MY_BITMAP *map, uint bit) +{ + DBUG_ASSERT(bit < map->n_bits); + ((uchar*)map->bitmap)[bit / 8] &= ~(1 << (bit & 7)); +} + + +static inline my_bool bitmap_is_set(const MY_BITMAP *map, uint bit) +{ + DBUG_ASSERT(bit < map->n_bits); + return ((uchar*)map->bitmap)[bit / 8] & (1 << (bit & 7)); +} + +/** + Quite unlike other C comparison functions ending with 'cmp', e.g. memcmp(), + strcmp(), this function returns true if the bitmaps are equal, and false + otherwise. + + @retval true The bitmaps are equal. + @retval false The bitmaps differ. + */ +static inline my_bool bitmap_cmp(const MY_BITMAP *map1, const MY_BITMAP *map2) +{ + DBUG_ASSERT(map1->n_bits > 0); + DBUG_ASSERT(map2->n_bits > 0); + + if (memcmp(map1->bitmap, map2->bitmap, 4*(no_words_in_map(map1)-1)) != 0) + return FALSE; + return ((*map1->last_word_ptr | map1->last_word_mask) == + (*map2->last_word_ptr | map2->last_word_mask)); +} + +/* + Clears all bits. This is allowed even for a zero-size bitmap. + */ +static inline void bitmap_clear_all(MY_BITMAP *map) +{ + memset(map->bitmap, 0, 4 * no_words_in_map(map)); +} + +/* + Sets all bits. This is allowed even for a zero-size bitmap. + */ +static inline void bitmap_set_all(MY_BITMAP *map) +{ + memset(map->bitmap, 0xFF, 4 * no_words_in_map(map)); +} + +#ifdef __cplusplus +} +#endif + +#endif /* _my_bitmap_h_ */ -- cgit v1.1