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103 lines
4.4 KiB
C
103 lines
4.4 KiB
C
/* 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; either version 2 of the License, or
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(at your option) any later version.
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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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#ifndef _my_bitmap_h_
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#define _my_bitmap_h_
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#include <my_pthread.h>
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#define MY_BIT_NONE (~(uint) 0)
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typedef struct st_bitmap
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{
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uint32 *bitmap;
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uint bitmap_size; /* number of bits occupied by the above */
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uint32 last_word_mask;
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uint32 *last_word_ptr;
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/*
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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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acquiring the mutex
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*/
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#ifdef THREAD
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pthread_mutex_t *mutex;
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#endif
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} MY_BITMAP;
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#ifdef __cplusplus
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extern "C" {
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#endif
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extern my_bool bitmap_init(MY_BITMAP *map, uint32 *buf, uint bitmap_size, my_bool thread_safe);
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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 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_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 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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#ifdef NOT_USED
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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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#endif
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/* Fast, not thread safe, bitmap functions */
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#define no_bytes_in_map(map) ((map->bitmap_size + 7)/8)
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#define no_words_in_map(map) ((map->bitmap_size + 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) ((MAP)->bitmap[(BIT) / 32] |= (1 << ((BIT) & 31)))
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#define bitmap_flip_bit(MAP, BIT) ((MAP)->bitmap[(BIT) / 32] ^= (1 << ((BIT) & 31)))
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#define bitmap_clear_bit(MAP, BIT) ((MAP)->bitmap[(BIT) / 32] &= ~ (1 << ((BIT) & 31)))
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#define bitmap_is_set(MAP, BIT) ((MAP)->bitmap[(BIT) / 32] & (1 << ((BIT) & 31)))
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#define bitmap_cmp(MAP1, MAP2) \
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(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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*(MAP)->last_word_ptr|= (MAP)->last_word_mask
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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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#ifdef __cplusplus
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}
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#endif
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#endif /* _my_bitmap_h_ */
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