// max_index is the 0-based position of the most significant bit that is
// allowed to be set.
DISPATCH_ALWAYS_INLINE_NDEBUG
static unsigned int
bitmap_set_first_unset_bit_upto_index(volatile bitmap_t *bitmap,
unsigned int max_index)
{
// No barriers needed in acquire path: the just-allocated
// continuation is "uninitialized", so the caller shouldn't
// load from it before storing, so we don't need to guard
// against reordering those loads.
#if defined(__x86_64__) // TODO rdar://problem/11477843
dispatch_assert(sizeof(*bitmap) == sizeof(uint64_t));
return dispatch_atomic_set_first_bit((volatile uint64_t *)bitmap,max_index);
#else
dispatch_assert(sizeof(*bitmap) == sizeof(uint32_t));
return dispatch_atomic_set_first_bit((volatile uint32_t *)bitmap,max_index);
#endif
}
// max_index is the 0-based position of the most significant bit that is
// allowed to be set.
DISPATCH_ALWAYS_INLINE_NDEBUG
static unsigned int
bitmap_set_first_unset_bit_upto_index(volatile bitmap_t *bitmap,
unsigned int max_index)
{
// No barriers needed in acquire path: the just-allocated
// continuation is "uninitialized", so the caller shouldn't
// load from it before storing, so we don't need to guard
// against reordering those loads.
dispatch_assert(sizeof(*bitmap) == sizeof(unsigned long));
return dispatch_atomic_set_first_bit(bitmap,max_index);
}
