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my_bitmap.h
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/* Copyright (c) 2001, 2011, Oracle and/or its affiliates. Copyright (c) 2009-2011, Monty Program 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; 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 <m_string.h> #include <my_pthread.h> typedef uint32 my_bitmap_map; typedef struct st_bitmap { my_bitmap_map *bitmap; 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_map last_word_mask; uint32 n_bits; /* number of bits occupied by the above */ } MY_BITMAP; #ifdef __cplusplus extern "C" { #endif /* compatibility functions */ #define bitmap_init(A,B,C,D) my_bitmap_init(A,B,C,D) #define bitmap_free(A) my_bitmap_free(A) extern void create_last_word_mask(MY_BITMAP *map); extern my_bool my_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 my_bool bitmap_union_is_set_all(const MY_BITMAP *map1, const MY_BITMAP *map2); extern my_bool bitmap_exists_intersection(const MY_BITMAP **bitmap_array, uint bitmap_count, uint start_bit, uint end_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_bits_set(const MY_BITMAP *map); extern uint bitmap_get_next_set(const MY_BITMAP *map, uint bitmap_bit); extern void my_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) #define bytes_word_aligned(bytes) (4*((bytes + 3)/4)) #define _bitmap_set_bit(MAP, BIT) (((uchar*)(MAP)->bitmap)[(BIT) / 8] \ |= (1 << ((BIT) & 7))) #define _bitmap_flip_bit(MAP, BIT) (((uchar*)(MAP)->bitmap)[(BIT) / 8] \ ^= (1 << ((BIT) & 7))) #define _bitmap_clear_bit(MAP, BIT) (((uchar*)(MAP)->bitmap)[(BIT) / 8] \ &= ~ (1 << ((BIT) & 7))) #define _bitmap_is_set(MAP, BIT) (uint) (((uchar*)(MAP)->bitmap)[(BIT) / 8] \ & (1 << ((BIT) & 7))) /* WARNING! The below symbols are inline functions in DEBUG builds and macros in non-DEBUG builds. The latter evaluate their 'bit' argument twice. NEVER use an increment/decrement operator with the 'bit' argument. It would work with DEBUG builds, but fails later in production builds! FORBIDDEN: bitmap_set_bit($my_bitmap, (field++)->field_index); */ #ifndef DBUG_OFF static inline void bitmap_set_bit(MY_BITMAP *map,uint bit) { DBUG_ASSERT(bit < (map)->n_bits); _bitmap_set_bit(map,bit); } static inline void bitmap_flip_bit(MY_BITMAP *map,uint bit) { DBUG_ASSERT(bit < (map)->n_bits); _bitmap_flip_bit(map,bit); } static inline void bitmap_clear_bit(MY_BITMAP *map,uint bit) { DBUG_ASSERT(bit < (map)->n_bits); _bitmap_clear_bit(map,bit); } static inline uint bitmap_is_set(const MY_BITMAP *map,uint bit) { DBUG_ASSERT(bit < (map)->n_bits); return _bitmap_is_set(map,bit); } #else #define bitmap_set_bit(MAP, BIT) _bitmap_set_bit(MAP, BIT) #define bitmap_flip_bit(MAP, BIT) _bitmap_flip_bit(MAP, BIT) #define bitmap_clear_bit(MAP, BIT) _bitmap_clear_bit(MAP, BIT) #define bitmap_is_set(MAP, BIT) _bitmap_is_set(MAP, BIT) #endif static inline my_bool bitmap_cmp(const MY_BITMAP *map1, const MY_BITMAP *map2) { 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)); } #define bitmap_clear_all(MAP) \ { memset((MAP)->bitmap, 0, 4*no_words_in_map((MAP))); } #define bitmap_set_all(MAP) \ (memset((MAP)->bitmap, 0xFF, 4*no_words_in_map((MAP)))) #ifdef __cplusplus } #endif #endif /* _my_bitmap_h_ */