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tomas@poseidon.ndb.mysql.com
2005-07-12 20:01:22 +02:00
parent 9743190cd9 e06e06ffeb
commit 674b6bb151
317 changed files with 12088 additions and 4363 deletions
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45
mysys/my_bitmap.c
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@ -159,6 +159,51 @@ void bitmap_free(MY_BITMAP *map)
}
/*
test if bit already set and set it if it was not (thread unsafe method)
SYNOPSIS
bitmap_fast_test_and_set()
MAP bit map struct
BIT bit number
RETURN
0 bit was not set
!=0 bit was set
*/
my_bool bitmap_fast_test_and_set(MY_BITMAP *map, uint bitmap_bit)
{
uchar *byte= map->bitmap + (bitmap_bit / 8);
uchar bit= 1 << ((bitmap_bit) & 7);
uchar res= (*byte) & bit;
*byte|= bit;
return res;
}
/*
test if bit already set and set it if it was not (thread safe method)
SYNOPSIS
bitmap_fast_test_and_set()
map bit map struct
bitmap_bit bit number
RETURN
0 bit was not set
!=0 bit was set
*/
my_bool bitmap_test_and_set(MY_BITMAP *map, uint bitmap_bit)
{
my_bool res;
DBUG_ASSERT(map->bitmap && bitmap_bit < map->bitmap_size*8);
bitmap_lock(map);
res= bitmap_fast_test_and_set(map, bitmap_bit);
bitmap_unlock(map);
}
uint bitmap_set_next(MY_BITMAP *map)
{
uint bit_found;