<s>
OpenComRTOS	B-Operating_System
is	O
a	O
commercial	O
network-centric	O
,	O
formally	O
developed	O
real-time	B-Operating_System
operating	I-Operating_System
system	I-Operating_System
(	O
RTOS	B-Operating_System
)	O
,	O
aimed	O
mainly	O
at	O
the	O
embedded	B-Architecture
system	I-Architecture
market	O
.	O
</s>
<s>
OpenComRTOS	B-Operating_System
was	O
developed	O
using	O
formal	B-Architecture
methods	I-Architecture
.	O
</s>
<s>
It	O
has	O
features	O
like	O
the	O
ability	O
to	O
support	O
heterogeneous	O
multi-processor	O
systems	O
transparently	O
,	O
independent	O
of	O
the	O
processor	O
word	O
size	O
(	O
16-bit	B-Device
,	O
24-bit	O
,	O
32-bit	O
,	O
64-bit	B-Device
)	O
,	O
and	O
the	O
communication	O
medium	O
(	O
shared	O
memory	O
,	O
buses	O
,	O
point-to-point	O
links	O
or	O
virtual	O
links	O
on	O
extant	O
communication	O
mechanisms	O
)	O
.	O
</s>
<s>
OpenComRTOS	B-Operating_System
is	O
based	O
on	O
the	O
meta-modelling	O
paradigm	O
of	O
Interacting	O
Entities	O
.	O
</s>
<s>
In	O
the	O
RTOS	B-Operating_System
,	O
the	O
unit	O
of	O
execution	O
is	O
a	O
Task	O
(	O
a	O
function	O
with	O
its	O
local	O
workspace	O
or	O
stack	O
)	O
.	O
</s>
<s>
The	O
current	O
implementation	O
provides	O
the	O
functions	O
of	O
traditional	O
RTOS	B-Operating_System
services	O
like	O
events	O
,	O
semaphores	O
,	O
ports	O
,	O
first	B-Operating_System
in	I-Operating_System
first	I-Operating_System
out	I-Operating_System
(	O
FIFO	B-Operating_System
)	O
stacks	O
,	O
resources	O
,	O
packet	O
pools	O
,	O
and	O
memory	O
pools	O
.	O
</s>
<s>
OpenComRTOS	B-Operating_System
uses	O
a	O
uniform	O
architecture	O
with	O
a	O
kernel	B-Operating_System
Task	O
,	O
driver	O
Tasks	O
,	O
and	O
application	O
Tasks	O
,	O
each	O
having	O
a	O
Task	O
input	O
Port	O
.	O
</s>
<s>
The	O
underlying	O
architecture	O
relies	O
on	O
the	O
use	O
of	O
prioritised	O
packet	B-Protocol
switching	I-Protocol
with	O
communication	O
and	O
routing	O
being	O
part	O
of	O
the	O
underlying	O
system	O
services	O
.	O
</s>
<s>
The	O
initial	O
purpose	O
for	O
developing	O
OpenComRTOS	B-Operating_System
was	O
to	O
provide	O
a	O
software	O
runtime	O
environment	O
supporting	O
a	O
coherent	O
and	O
unified	O
systems	O
engineering	O
methodology	O
based	O
on	O
Interacting	O
Entities	O
.	O
</s>
<s>
A	O
formerly	O
developed	O
RTOS	B-Operating_System
named	O
Virtuoso	O
served	O
as	O
a	O
guideline	O
.	O
</s>
<s>
Virtuoso	O
is	O
a	O
distributed	B-Architecture
RTOS	B-Operating_System
,	O
developed	O
by	O
Eonic	O
Systems	O
until	O
the	O
technology	O
was	O
sold	O
to	O
Wind	O
River	O
Systems	O
in	O
2001	O
.	O
</s>
<s>
OpenComRTOS	B-Operating_System
is	O
conceptually	O
a	O
fourth	O
generation	O
of	O
Virtuoso	O
although	O
it	O
was	O
a	O
clean	O
room	O
development	O
.	O
</s>
<s>
The	O
Virtuoso	O
RTOS	B-Operating_System
had	O
its	O
origin	O
in	O
the	O
pioneering	O
Inmos	B-General_Concept
Transputer	I-General_Concept
,	O
a	O
partial	O
hardware	O
implementation	O
of	O
C.A.R.	O
</s>
<s>
Oil	O
exploration	O
system	O
with	O
12,000	O
processors	O
featuring	O
microcontrollers	O
,	O
fixed	O
point	O
and	O
floating	O
point	O
DSPs	O
and	O
a	O
Linux	B-Application
host	O
in	O
a	O
single	O
network	O
.	O
</s>
<s>
Converting	O
a	O
400,000	O
lines	O
application	O
running	O
on	O
a	O
Portable	O
Operating	O
System	O
Interface	O
(	O
POSIX	O
)	O
style	O
RTOS	B-Operating_System
to	O
OpenComRTOS	B-Operating_System
.	O
</s>
<s>
For	O
the	O
development	O
of	O
OpenComRTOS	B-Operating_System
a	O
systematic	O
but	O
iterative	O
engineering	O
process	O
was	O
followed	O
.	O
</s>
<s>
Requirements	O
and	O
specifications	O
being	O
defined	O
,	O
models	O
were	O
developed	O
in	O
Leslie	O
Lamport	O
's	O
temporal	O
logic	O
of	O
actions	O
(	O
TLA+	O
)	O
and	O
then	O
model	B-Application
checked	I-Application
with	O
the	O
corresponding	O
TLC	O
model	B-Application
checker	I-Application
.	O
</s>
<s>
The	O
timer	O
and	O
associated	O
time-out	O
functionality	O
for	O
services	O
were	O
model	B-Application
checked	I-Application
using	O
the	O
Uppaal	B-Application
Model	I-Application
Checker	I-Application
.	O
</s>
<s>
In	O
2011	O
Springer	O
published	O
the	O
book	O
on	O
the	O
OpenComRTOS	B-Operating_System
project	O
.	O
</s>
<s>
OpenComRTOS	B-Operating_System
comes	O
with	O
many	O
tools	O
.	O
</s>
<s>
OpenComRTOS	B-Operating_System
was	O
developed	O
for	O
embedded	B-Architecture
systems	I-Architecture
and	O
is	O
written	O
in	O
portable	O
ANSI	O
C	O
,	O
except	O
the	O
context	O
switch	O
and	O
ISR	O
interfaces	O
.	O
</s>
<s>
OpenComRTOS	B-Operating_System
has	O
been	O
ported	O
to	O
the	O
following	O
targets	O
:	O
</s>
<s>
Freescale	O
PowerPC	B-Architecture
,	O
Texas	O
Instruments	O
C66xx	O
DSP	B-Architecture
,	O
Melexis	O
MLX16	O
,	O
ARM	B-Architecture
Cortex	O
M3/4	O
,	O
Xilinx	O
MicroBlaze	B-Device
,	O
LEON3	O
,	O
NXP	O
CoolFlux	O
DSP	B-Architecture
and	O
to	O
MS-Windows	O
and	O
Linux	B-Application
.	O
</s>
<s>
As	O
the	O
RTOS	B-Operating_System
kernel	B-Operating_System
is	O
identical	O
for	O
single	O
or	O
multi-processor	O
nodes	O
,	O
supporting	O
a	O
multi-processor	O
system	O
requires	O
only	O
to	O
write	O
a	O
small	O
task	O
level	O
driver	O
that	O
can	O
send	O
and	O
receives	O
Packets	O
.	O
</s>
<s>
OpenComRTOS	B-Operating_System
is	O
made	O
available	O
in	O
binary	O
,	O
source	O
code	O
and	O
Open	O
Technology	O
licenses	O
.	O
</s>
