Merging BSDPort into HotSpot mainline

[Tom Rodriguez]

> 
> I tested the zero build on OpenBSD and found that the above changes are needed
> for the build to work. There was one other minor change needed as well.
> 
> The following is the diff that can be applied on top of the webrev to fix this fiile:

I incorporated that.

> 
> If possible, this minor change is needed to fix the zero build on OpenBSD. This is diff would be applied on top of the webrev. Alternatively this can be handled later after the webrev is merged.:

I added this as well.  Thanks.

tom

> 
> =========== start ==================
> --- hotspot/src/os_cpu/bsd_zero/vm/os_bsd_zero.cpp.orig	Fri Sep 16 07:31:22 2011
> +++ hotspot/src/os_cpu/bsd_zero/vm/os_bsd_zero.cpp	Fri Sep 16 07:31:45 2011
> @@ -24,6 +24,7 @@
>  */
> 
> #if defined(_ALLBSD_SOURCE) && !defined(__APPLE__) && !defined(__NetBSD__)
> +# include <pthread.h>
> # include <pthread_np.h> /* For pthread_attr_get_np */
> #endif
> 
> @@ -341,7 +342,7 @@ static void current_stack_region(address *bottom, size
> 
>   stack_top = (address) ss.ss_sp;
>   stack_bytes  = ss.ss_size;
> -  stack_bottom = stacktop - stack_bytes;
> +  stack_bottom = stack_top - stack_bytes;
> #elif defined(_ALLBSD_SOURCE)
>   pthread_attr_t attr;
> 
> =========== end ===================