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Manual merge

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sergefp@mysql.com
2004-06-14 11:18:56 +04:00
parent 078f717804 2e93dfaf42
commit ee0a516ccd
30 changed files with 4470 additions and 599 deletions
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66
mysys/my_bitmap.c
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@ -28,6 +28,9 @@
* when both arguments are bitmaps, they must be of the same size
* bitmap_intersect() is an exception :)
(for for Bitmap::intersect(ulonglong map2buff))
If THREAD is defined all bitmap operations except bitmap_init/bitmap_free
are thread-safe.
TODO:
Make assembler THREAD safe versions of these using test-and-set instructions
@ -330,3 +333,66 @@ void bitmap_union(MY_BITMAP *map, const MY_BITMAP *map2)
bitmap_unlock(map);
}
/*
SYNOPSIS
bitmap_bits_set()
map
RETURN
Number of set bits in the bitmap.
*/
uint bitmap_bits_set(const MY_BITMAP *map)
{
uchar *m= map->bitmap;
uchar *end= m + map->bitmap_size;
uint res= 0;
DBUG_ASSERT(map->bitmap);
bitmap_lock((MY_BITMAP *)map);
while (m < end)
{
res+= my_count_bits_ushort(*m++);
}
bitmap_unlock((MY_BITMAP *)map);
return res;
}
/*
SYNOPSIS
bitmap_get_first()
map
RETURN
Number of first unset bit in the bitmap or MY_BIT_NONE if all bits are set.
*/
uint bitmap_get_first(const MY_BITMAP *map)
{
uchar *bitmap=map->bitmap;
uint bit_found = MY_BIT_NONE;
uint bitmap_size=map->bitmap_size*8;
uint i;
DBUG_ASSERT(map->bitmap);
bitmap_lock((MY_BITMAP *)map);
for (i=0; i < bitmap_size ; i++, bitmap++)
{
if (*bitmap != 0xff)
{ /* Found slot with free bit */
uint b;
for (b=0; ; b++)
{
if (!(*bitmap & (1 << b)))
{
bit_found = (i*8)+b;
break;
}
}
break; /* Found bit */
}
}
bitmap_unlock((MY_BITMAP *)map);
return bit_found;
}