<s>
NextBSD	B-Operating_System
was	O
an	O
operating	B-General_Concept
system	I-General_Concept
initially	O
based	O
on	O
the	O
trunk	B-General_Concept
version	O
of	O
FreeBSD	B-Operating_System
as	O
of	O
August	O
2015	O
.	O
</s>
<s>
It	O
is	O
a	O
fork	B-Application
of	O
FreeBSD	B-Operating_System
which	O
implements	O
new	O
features	O
developed	O
on	O
branches	B-General_Concept
but	O
not	O
yet	O
implemented	O
in	O
FreeBSD	B-Operating_System
.	O
</s>
<s>
As	O
of	O
2019	O
the	O
website	O
seems	O
defunct	O
,	O
and	O
the	O
later	O
commits	O
on	O
GitHub	B-Application
date	O
from	O
October	O
2019	O
.	O
</s>
<s>
The	O
basic	O
features	O
of	O
launchd	B-Application
,	O
notifyd	O
,	O
asld	O
,	O
and	O
libdispatch	O
work	O
.	O
</s>
<s>
These	O
can	O
be	O
installed	O
by	O
cloning	B-Application
the	O
NextBSD	B-Operating_System
repository	B-Application
from	O
GitHub	B-Application
,	O
building	O
GENERIC	O
or	O
MACHTEST	O
kernels	B-Operating_System
,	O
installing	O
a	O
new	O
world	O
on	O
an	O
existing	O
10.x	O
or	O
CURRENT	O
system	O
,	O
and	O
then	O
following	O
the	O
instructions	O
in	O
the	O
README	O
.	O
</s>
<s>
Launchd	B-Application
will	O
start	O
the	O
initial	O
jobs	O
that	O
are	O
part	O
of	O
the	O
repo	O
now	O
.	O
</s>
<s>
NeXTBSD	B-Operating_System
was	O
announced	O
by	O
Jordan	O
Hubbard	O
and	O
Kip	O
Macy	O
in	O
August	O
2015	O
at	O
the	O
Bay	O
Area	O
FreeBSD	B-Operating_System
Users	O
Group	O
(	O
BAFUG	O
)	O
.	O
</s>
<s>
NeXTBSD	B-Operating_System
is	O
based	O
on	O
the	O
FreeBSD-CURRENT	O
kernel	B-Operating_System
while	O
adding	O
in	O
Mach	B-Operating_System
IPC	O
,	O
Libdispatch	O
,	O
notifyd	O
,	O
asld	O
,	O
launchd	B-Application
,	O
and	O
other	O
components	O
derived	O
from	O
Darwin	B-Operating_System
,	O
Apple	O
's	O
open-source	O
code	O
for	O
macOS	B-Application
.	O
</s>
<s>
In	O
conjunction	O
with	O
memory	O
managers	O
,	O
Mach	B-Operating_System
implements	O
the	O
notion	O
of	O
a	O
sparse	O
virtual	O
address	O
space	O
and	O
shared	O
memory	O
.	O
</s>
<s>
(	O
Mach	B-Operating_System
semaphores	O
and	O
lock	O
sets	O
are	O
not	O
supported	O
)	O
.	O
</s>
<s>
Current	O
BSD	O
operating	B-General_Concept
system	I-General_Concept
variants	O
support	O
many	O
of	O
the	O
common	O
IEEE	O
,	O
ANSI	O
,	O
ISO	O
,	O
and	O
POSIX	O
standards	O
,	O
while	O
retaining	O
most	O
of	O
the	O
traditional	O
BSD	O
behavior	O
.	O
</s>
<s>
Like	O
AT&T	B-Operating_System
Unix	I-Operating_System
,	O
the	O
BSD	O
kernel	B-Operating_System
is	O
monolithic	B-Operating_System
,	O
meaning	O
that	O
device	O
drivers	O
in	O
the	O
kernel	B-Operating_System
run	O
in	O
privileged	B-Operating_System
mode	I-Operating_System
,	O
as	O
part	O
of	O
the	O
core	O
of	O
the	O
operating	B-General_Concept
system	I-General_Concept
.	O
</s>
<s>
A	O
selection	O
of	O
significant	O
Unix	B-Application
versions	O
and	O
Unix-like	B-Operating_System
operating	I-Operating_System
systems	I-Operating_System
that	O
descend	O
from	O
BSD	O
includes	O
:	O
</s>
<s>
FreeBSD	B-Operating_System
,	O
an	O
open	O
source	O
general	O
purpose	O
operating	B-General_Concept
system	I-General_Concept
.	O
</s>
