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/* Copyright (C) 2000 MySQL AB
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; version 2 of the License.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */
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#define MY_BIT_NONE (~(uint) 0)
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typedef uint32 my_bitmap_map;
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typedef struct st_bitmap
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my_bitmap_map *bitmap;
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uint n_bits; /* number of bits occupied by the above */
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my_bitmap_map last_word_mask;
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my_bitmap_map *last_word_ptr;
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mutex will be acquired for the duration of each bitmap operation if
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thread_safe flag in bitmap_init was set. Otherwise, we optimize by not
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pthread_mutex_t *mutex;
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extern void create_last_word_mask(MY_BITMAP *map);
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extern my_bool bitmap_init(MY_BITMAP *map, my_bitmap_map *buf, uint n_bits,
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extern my_bool bitmap_is_clear_all(const MY_BITMAP *map);
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extern my_bool bitmap_is_prefix(const MY_BITMAP *map, uint prefix_size);
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extern my_bool bitmap_is_set_all(const MY_BITMAP *map);
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extern my_bool bitmap_is_subset(const MY_BITMAP *map1, const MY_BITMAP *map2);
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extern my_bool bitmap_is_overlapping(const MY_BITMAP *map1,
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const MY_BITMAP *map2);
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extern my_bool bitmap_test_and_set(MY_BITMAP *map, uint bitmap_bit);
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extern my_bool bitmap_test_and_clear(MY_BITMAP *map, uint bitmap_bit);
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extern my_bool bitmap_fast_test_and_set(MY_BITMAP *map, uint bitmap_bit);
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extern uint bitmap_set_next(MY_BITMAP *map);
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extern uint bitmap_get_first(const MY_BITMAP *map);
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extern uint bitmap_get_first_set(const MY_BITMAP *map);
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extern uint bitmap_bits_set(const MY_BITMAP *map);
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extern void bitmap_free(MY_BITMAP *map);
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extern void bitmap_set_above(MY_BITMAP *map, uint from_byte, uint use_bit);
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extern void bitmap_set_prefix(MY_BITMAP *map, uint prefix_size);
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extern void bitmap_intersect(MY_BITMAP *map, const MY_BITMAP *map2);
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extern void bitmap_subtract(MY_BITMAP *map, const MY_BITMAP *map2);
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extern void bitmap_union(MY_BITMAP *map, const MY_BITMAP *map2);
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extern void bitmap_xor(MY_BITMAP *map, const MY_BITMAP *map2);
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extern void bitmap_invert(MY_BITMAP *map);
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extern void bitmap_copy(MY_BITMAP *map, const MY_BITMAP *map2);
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extern uint bitmap_lock_set_next(MY_BITMAP *map);
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extern void bitmap_lock_clear_bit(MY_BITMAP *map, uint bitmap_bit);
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extern uint bitmap_lock_bits_set(const MY_BITMAP *map);
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extern my_bool bitmap_lock_is_set_all(const MY_BITMAP *map);
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extern uint bitmap_lock_get_first(const MY_BITMAP *map);
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extern uint bitmap_lock_get_first_set(const MY_BITMAP *map);
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extern my_bool bitmap_lock_is_subset(const MY_BITMAP *map1,
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const MY_BITMAP *map2);
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extern my_bool bitmap_lock_is_prefix(const MY_BITMAP *map, uint prefix_size);
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extern my_bool bitmap_lock_is_set(const MY_BITMAP *map, uint bitmap_bit);
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extern my_bool bitmap_lock_is_clear_all(const MY_BITMAP *map);
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extern my_bool bitmap_lock_cmp(const MY_BITMAP *map1, const MY_BITMAP *map2);
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extern void bitmap_lock_set_all(MY_BITMAP *map);
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extern void bitmap_lock_clear_all(MY_BITMAP *map);
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extern void bitmap_lock_set_bit(MY_BITMAP *map, uint bitmap_bit);
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extern void bitmap_lock_flip_bit(MY_BITMAP *map, uint bitmap_bit);
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extern void bitmap_lock_set_prefix(MY_BITMAP *map, uint prefix_size);
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extern void bitmap_lock_intersect(MY_BITMAP *map, const MY_BITMAP *map2);
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extern void bitmap_lock_subtract(MY_BITMAP *map, const MY_BITMAP *map2);
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extern void bitmap_lock_union(MY_BITMAP *map, const MY_BITMAP *map2);
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extern void bitmap_lock_xor(MY_BITMAP *map, const MY_BITMAP *map2);
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extern void bitmap_lock_invert(MY_BITMAP *map);
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/* Fast, not thread safe, bitmap functions */
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#define bitmap_buffer_size(bits) (((bits)+31)/32)*4
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#define no_bytes_in_map(map) (((map)->n_bits + 7)/8)
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#define no_words_in_map(map) (((map)->n_bits + 31)/32)
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#define bytes_word_aligned(bytes) (4*((bytes + 3)/4))
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#define _bitmap_set_bit(MAP, BIT) (((uchar*)(MAP)->bitmap)[(BIT) / 8] \
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|= (1 << ((BIT) & 7)))
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#define _bitmap_flip_bit(MAP, BIT) (((uchar*)(MAP)->bitmap)[(BIT) / 8] \
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^= (1 << ((BIT) & 7)))
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#define _bitmap_clear_bit(MAP, BIT) (((uchar*)(MAP)->bitmap)[(BIT) / 8] \
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&= ~ (1 << ((BIT) & 7)))
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#define _bitmap_is_set(MAP, BIT) (uint) (((uchar*)(MAP)->bitmap)[(BIT) / 8] \
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& (1 << ((BIT) & 7)))
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The below symbols are inline functions in DEBUG builds and macros in
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non-DEBUG builds. The latter evaluate their 'bit' argument twice.
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NEVER use an increment/decrement operator with the 'bit' argument.
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It would work with DEBUG builds, but fails later in production builds!
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FORBIDDEN: bitmap_set_bit($my_bitmap, (field++)->field_index);
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bitmap_set_bit(MY_BITMAP *map,uint bit)
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DBUG_ASSERT(bit < (map)->n_bits);
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_bitmap_set_bit(map,bit);
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bitmap_flip_bit(MY_BITMAP *map,uint bit)
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DBUG_ASSERT(bit < (map)->n_bits);
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_bitmap_flip_bit(map,bit);
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bitmap_clear_bit(MY_BITMAP *map,uint bit)
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DBUG_ASSERT(bit < (map)->n_bits);
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_bitmap_clear_bit(map,bit);
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bitmap_is_set(const MY_BITMAP *map,uint bit)
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DBUG_ASSERT(bit < (map)->n_bits);
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return _bitmap_is_set(map,bit);
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#define bitmap_set_bit(MAP, BIT) _bitmap_set_bit(MAP, BIT)
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#define bitmap_flip_bit(MAP, BIT) _bitmap_flip_bit(MAP, BIT)
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#define bitmap_clear_bit(MAP, BIT) _bitmap_clear_bit(MAP, BIT)
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#define bitmap_is_set(MAP, BIT) _bitmap_is_set(MAP, BIT)
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static inline my_bool bitmap_cmp(const MY_BITMAP *map1, const MY_BITMAP *map2)
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*(map1)->last_word_ptr|= (map1)->last_word_mask;
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*(map2)->last_word_ptr|= (map2)->last_word_mask;
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return memcmp((map1)->bitmap, (map2)->bitmap, 4*no_words_in_map((map1)))==0;
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#define bitmap_clear_all(MAP) \
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{ memset((MAP)->bitmap, 0, 4*no_words_in_map((MAP))); }
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#define bitmap_set_all(MAP) \
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(memset((MAP)->bitmap, 0xFF, 4*no_words_in_map((MAP))))
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check, set and clear a bit of interest of an integer.
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If the bit is out of range @retval -1. Otherwise
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bit_is_set @return 0 or 1 reflecting the bit is set or not;
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bit_do_set @return 1 (bit is set 1)
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bit_do_clear @return 0 (bit is cleared to 0)
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#define bit_is_set(I,B) (sizeof(I) * CHAR_BIT > (B) ? \
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(((I) & (ULL(1) << (B))) == 0 ? 0 : 1) : -1)
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#define bit_do_set(I,B) (sizeof(I) * CHAR_BIT > (B) ? \
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((I) |= (ULL(1) << (B)), 1) : -1)
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#define bit_do_clear(I,B) (sizeof(I) * CHAR_BIT > (B) ? \
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((I) &= ~(ULL(1) << (B)), 0) : -1)
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#endif /* _my_bitmap_h_ */