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Diffstat (limited to 'externals/mysql/my_bitmap.h')
| -rw-r--r-- | externals/mysql/my_bitmap.h | 182 |
1 files changed, 182 insertions, 0 deletions
diff --git a/externals/mysql/my_bitmap.h b/externals/mysql/my_bitmap.h new file mode 100644 index 00000000000..d8c9a0c2b69 --- /dev/null +++ b/externals/mysql/my_bitmap.h @@ -0,0 +1,182 @@ +/* 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; 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */ + +#ifndef _my_bitmap_h_ +#define _my_bitmap_h_ + +#define MY_BIT_NONE (~(uint) 0) + +#include <m_string.h> + +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 + */ +#ifdef THREAD + pthread_mutex_t *mutex; +#endif +} 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_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); +#ifdef NOT_USED +extern uint bitmap_lock_bits_set(const MY_BITMAP *map); +extern my_bool bitmap_lock_is_set_all(const MY_BITMAP *map); +extern uint bitmap_lock_get_first(const MY_BITMAP *map); +extern uint bitmap_lock_get_first_set(const MY_BITMAP *map); +extern my_bool bitmap_lock_is_subset(const MY_BITMAP *map1, + const MY_BITMAP *map2); +extern my_bool bitmap_lock_is_prefix(const MY_BITMAP *map, uint prefix_size); +extern my_bool bitmap_lock_is_set(const MY_BITMAP *map, uint bitmap_bit); +extern my_bool bitmap_lock_is_clear_all(const MY_BITMAP *map); +extern my_bool bitmap_lock_cmp(const MY_BITMAP *map1, const MY_BITMAP *map2); +extern void bitmap_lock_set_all(MY_BITMAP *map); +extern void bitmap_lock_clear_all(MY_BITMAP *map); +extern void bitmap_lock_set_bit(MY_BITMAP *map, uint bitmap_bit); +extern void bitmap_lock_flip_bit(MY_BITMAP *map, uint bitmap_bit); +extern void bitmap_lock_set_prefix(MY_BITMAP *map, uint prefix_size); +extern void bitmap_lock_intersect(MY_BITMAP *map, const MY_BITMAP *map2); +extern void bitmap_lock_subtract(MY_BITMAP *map, const MY_BITMAP *map2); +extern void bitmap_lock_union(MY_BITMAP *map, const MY_BITMAP *map2); +extern void bitmap_lock_xor(MY_BITMAP *map, const MY_BITMAP *map2); +extern void bitmap_lock_invert(MY_BITMAP *map); +#endif +/* 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) +{ + *(map1)->last_word_ptr|= (map1)->last_word_mask; + *(map2)->last_word_ptr|= (map2)->last_word_mask; + return memcmp((map1)->bitmap, (map2)->bitmap, 4*no_words_in_map((map1)))==0; +} + +#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)))) + +/** + check, set and clear a bit of interest of an integer. + + If the bit is out of range @retval -1. Otherwise + bit_is_set @return 0 or 1 reflecting the bit is set or not; + bit_do_set @return 1 (bit is set 1) + bit_do_clear @return 0 (bit is cleared to 0) +*/ + +#define bit_is_set(I,B) (sizeof(I) * CHAR_BIT > (B) ? \ + (((I) & (1ULL << (B))) == 0 ? 0 : 1) : -1) +#define bit_do_set(I,B) (sizeof(I) * CHAR_BIT > (B) ? \ + ((I) |= (1ULL << (B)), 1) : -1) +#define bit_do_clear(I,B) (sizeof(I) * CHAR_BIT > (B) ? \ + ((I) &= ~(1ULL << (B)), 0) : -1) + +#ifdef __cplusplus +} +#endif + +#endif /* _my_bitmap_h_ */ |