my_bitmap.h
上传用户:romrleung
上传日期:2022-05-23
资源大小:18897k
文件大小:3k
- /* Copyright (C) 2000 MySQL 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; either version 2 of the License, or
- (at your option) any later version.
- 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */
- #ifndef _my_bitmap_h_
- #define _my_bitmap_h_
- #include <my_pthread.h>
- #define MY_BIT_NONE (~(uint) 0)
- typedef struct st_bitmap
- {
- uchar *bitmap;
- uint bitmap_size;
- /*
- 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
- */
- #ifdef THREAD
- pthread_mutex_t *mutex;
- #endif
- } MY_BITMAP;
- #ifdef __cplusplus
- extern "C" {
- #endif
- extern my_bool bitmap_cmp(const MY_BITMAP *map1, const MY_BITMAP *map2);
- extern my_bool bitmap_init(MY_BITMAP *map, uchar *buf, uint bitmap_size, 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(const MY_BITMAP *map, uint bitmap_bit);
- 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 uint bitmap_set_next(MY_BITMAP *map);
- extern void bitmap_clear_all(MY_BITMAP *map);
- extern void bitmap_clear_bit(MY_BITMAP *map, uint bitmap_bit);
- extern void bitmap_free(MY_BITMAP *map);
- extern void bitmap_intersect(MY_BITMAP *map, const MY_BITMAP *map2);
- extern void bitmap_set_all(MY_BITMAP *map);
- extern void bitmap_set_bit(MY_BITMAP *map, uint bitmap_bit);
- extern void bitmap_set_prefix(MY_BITMAP *map, uint prefix_size);
- extern void bitmap_subtract(MY_BITMAP *map, const MY_BITMAP *map2);
- extern void bitmap_union(MY_BITMAP *map, const MY_BITMAP *map2);
- /* Fast, not thread safe, bitmap functions */
- #define bitmap_fast_set_bit(MAP, BIT) (MAP)->bitmap[(BIT) / 8] |= (1 << ((BIT) & 7))
- #define bitmap_fast_clear_bit(MAP, BIT) (MAP)->bitmap[(BIT) / 8] &= ~ (1 << ((BIT) & 7))
- #define bitmap_fast_is_set(MAP, BIT) (MAP)->bitmap[(BIT) / 8] & (1 << ((BIT) & 7))
- #ifdef __cplusplus
- }
- #endif
- #endif /* _my_bitmap_h_ */