<s>
Limbo	B-Application
is	O
a	O
programming	O
language	O
for	O
writing	O
distributed	O
systems	O
and	O
is	O
the	O
language	O
used	O
to	O
write	O
applications	B-Application
for	O
the	O
Inferno	B-Operating_System
operating	I-Operating_System
system	I-Operating_System
.	O
</s>
<s>
The	O
Limbo	B-Application
compiler	B-Language
generates	O
architecture-independent	O
object	B-Language
code	I-Language
which	O
is	O
then	O
interpreted	O
by	O
the	O
Dis	B-Application
virtual	O
machine	O
or	O
compiled	B-Language
just	O
before	O
runtime	O
to	O
improve	O
performance	O
.	O
</s>
<s>
Therefore	O
all	O
Limbo	B-Application
applications	B-Application
are	O
completely	O
portable	O
across	O
all	O
Inferno	B-Operating_System
platforms	O
.	O
</s>
<s>
Limbo	B-Application
's	O
approach	O
to	O
concurrency	B-Architecture
was	O
inspired	O
by	O
Hoare	O
's	O
communicating	O
sequential	O
processes	O
(	O
CSP	O
)	O
,	O
as	O
implemented	O
and	O
amended	O
in	O
Pike	O
's	O
earlier	O
Newsqueak	B-Language
language	O
and	O
Winterbottom	O
's	O
Alef	B-Application
.	O
</s>
<s>
Limbo	B-Application
supports	O
the	O
following	O
features	O
:	O
</s>
<s>
The	O
Dis	B-Application
virtual	O
machine	O
that	O
executes	O
Limbo	B-Application
code	O
is	O
a	O
CISC-like	O
VM	O
,	O
with	O
instructions	O
for	O
arithmetic	O
,	O
control	O
flow	O
,	O
data	O
motion	O
,	O
process	B-Operating_System
creation	O
,	O
synchronizing	O
and	O
communicating	O
between	O
processes	O
,	O
loading	O
modules	B-Architecture
of	O
code	O
,	O
and	O
support	O
for	O
higher-level	O
data-types	O
:	O
strings	O
,	O
arrays	O
,	O
lists	O
,	O
and	O
communication	O
channels	O
.	O
</s>
<s>
It	O
uses	O
a	O
hybrid	O
of	O
reference	B-General_Concept
counting	I-General_Concept
and	O
a	O
real-time	B-General_Concept
garbage-collector	B-General_Concept
for	O
cyclic	O
data	O
.	O
</s>
<s>
Aspects	O
of	O
the	O
design	O
of	O
Dis	B-Application
were	O
inspired	O
by	O
the	O
AT&T	B-Application
Hobbit	I-Application
microprocessor	O
,	O
as	O
used	O
in	O
the	O
original	O
BeBox	B-Device
.	O
</s>
<s>
Limbo	B-Application
uses	O
Ada-style	O
definitions	O
as	O
in	O
:	O
</s>
<s>
The	O
3rd	O
edition	O
of	O
the	O
Inferno	B-Operating_System
operating	I-Operating_System
system	I-Operating_System
and	O
Limbo	B-Application
programming	I-Application
language	I-Application
are	O
described	O
in	O
the	O
textbook	O
Inferno	B-Operating_System
Programming	O
with	O
Limbo	B-Application
(	O
Chichester	O
:	O
John	O
Wiley	O
&	O
Sons	O
,	O
2003	O
)	O
,	O
by	O
Phillip	O
Stanley-Marbell	O
.	O
</s>
<s>
Another	O
textbook	O
The	O
Inferno	B-Operating_System
Programming	O
Book	O
:	O
An	O
Introduction	O
to	O
Programming	O
for	O
the	O
Inferno	B-Operating_System
Distributed	O
System	O
,	O
by	O
Martin	O
Atkins	O
,	O
Charles	O
Forsyth	O
,	O
Rob	O
Pike	O
and	O
Howard	O
Trickey	O
,	O
was	O
started	O
,	O
but	O
never	O
released	O
.	O
</s>
