suggesting some small changes with huge speed impact

[Guenther Fuerthaller]

hello,

I would like to suggest two small changes
which have a huge speed impact - at least
on mingwin.
The speed problem is caused by mutex locking.
The solution tries to avoid mutex locking
as much as (I think is) possible.
The lock is done in NSZoneFromPointer
and this is called from NSData.

In NSData.m I suggest to add the following
method to the class NSMutableDataMalloc:
- (void) dealloc
{
  if (bytes != 0)
    {
      NSZoneFree(zone, bytes);
      bytes = 0;
    }
  [super dealloc];
}

In NSZone.m in the function NSZoneFromPointer
I suggest to add the following line before the
locking code:
  if (zone_list == 0) return __nszone_private_hidden_default_zone;

Guenther