<s>
RTX	B-Operating_System
is	O
a	O
line	O
of	O
real-time	B-Operating_System
operating	I-Operating_System
system	I-Operating_System
(	O
RTOS	B-Operating_System
)	O
extensions	O
by	O
the	O
firm	O
IntervalZero	O
.	O
</s>
<s>
They	O
are	O
a	O
software	O
extension	O
or	O
abstraction	B-Architecture
layer	I-Architecture
that	O
converts	O
Microsoft	B-Application
Windows	I-Application
operating	I-Application
system	I-Application
into	O
a	O
RTOS	B-Operating_System
.	O
</s>
<s>
RTX	B-Operating_System
real-time	O
software	O
extensions	O
to	O
Windows	O
combines	O
the	O
familiar	O
user	O
experience	O
of	O
Microsoft	B-Application
Windows	I-Application
(	O
rich	O
GUI	B-Application
,	O
extant	O
drivers	O
and	O
software	O
,	O
...	O
)	O
and	O
the	O
direct	O
control	O
of	O
embedded	O
hardware	O
by	O
providing	O
hard	O
real-time	O
determinism	O
and	O
symmetric	B-Operating_System
multiprocessing	I-Operating_System
(	O
SMP	O
)	O
abilities	O
.	O
</s>
<s>
The	O
RTX	B-Operating_System
extensions	O
have	O
followed	O
the	O
Windows	O
architecture	O
since	O
Windows	B-Device
NT	I-Device
3.5	I-Device
.	O
</s>
<s>
Generally	O
,	O
RTX	B-Operating_System
supports	O
32-bit	B-Application
Windows	I-Application
;	O
RTX64	O
supports	O
64-bit	B-Device
Windows	O
.	O
</s>
<s>
As	O
of	O
2015	O
,	O
RTX2016	O
supports	O
32-bits	O
,	O
RTX64	O
4.x	O
supports	O
64-bits	B-Device
.	O
</s>
<s>
The	O
systems	O
are	O
used	O
in	O
different	O
markets	O
such	O
as	O
industrial	O
automation	B-Application
,	O
testbed	O
and	O
simulation	O
,	O
digital	O
audio	O
,	O
digital	O
video	O
,	O
aerospace	O
military	O
,	O
medical	O
devices	O
,	O
electrical	O
grid	O
,	O
electricity	O
generation	O
,	O
and	O
other	O
uses	O
.	O
</s>
<s>
Hardware	B-Operating_System
abstraction	I-Operating_System
layer	I-Operating_System
extensionRTX	O
relies	O
on	O
a	O
Windows	O
hardware	B-Operating_System
abstraction	I-Operating_System
layer	I-Operating_System
(	O
HAL	O
)	O
extension	O
to	O
initialize	O
the	O
RTX-dedicated	O
processors	B-General_Concept
and	O
to	O
provide	O
the	O
real-time	O
subsystem	O
(	O
RTSS	O
)	O
with	O
high	O
resolution	O
timers	O
(	O
up	O
to	O
1	O
microsecond	O
)	O
.	O
</s>
<s>
It	O
also	O
provides	O
an	O
interrupt	B-Application
isolation	O
mechanism	O
.	O
</s>
<s>
Symmetric	O
multiprocessingLike	O
Windows	O
,	O
RTX	B-Operating_System
is	O
based	O
on	O
a	O
symmetric	B-Operating_System
multiprocessing	I-Operating_System
(	O
SMP	O
)	O
architecture	O
.	O
</s>
<s>
Depending	O
on	O
the	O
real-time	O
needs	O
,	O
users	O
can	O
choose	O
the	O
number	O
of	O
processors	B-General_Concept
to	O
dedicate	O
to	O
RTX	B-Operating_System
to	O
run	O
real-time	O
processes	O
.	O
</s>
<s>
RTX	B-Operating_System
can	O
use	O
up	O
to	O
31	O
dedicated	O
processors	B-General_Concept
;	O
RTX64	O
can	O
use	O
up	O
to	O
63	O
.	O
</s>
<s>
Users	O
can	O
then	O
scale	O
real-time	O
applications	O
between	O
the	O
RTX	B-Operating_System
dedicated	O
processors	B-General_Concept
.	O
</s>
<s>
Interrupt	B-Application
managementRTX	O
supports	O
both	O
line	B-General_Concept
based	I-General_Concept
and	O
Message	B-Architecture
Signaled	I-Architecture
Interrupts	I-Architecture
(	O
MSI/MSI	O
-X	O
)	O
.	O
</s>
<s>
Interrupt	B-Application
service	O
thread	O
(	O
IST	O
)	O
latencies	O
are	O
under	O
10	O
microseconds	O
.	O
</s>
<s>
Memory	O
managementThe	O
deterministic	O
memory	O
pool	O
allocated	O
for	O
RTX	B-Operating_System
is	O
taken	O
from	O
the	O
system	O
non-paged	O
pool	O
memory	O
.	O
</s>
<s>
For	O
example	O
,	O
under	O
Windows	O
7	O
,	O
the	O
amount	O
of	O
non-paged	O
pool	O
is	O
:	O
for	O
32-bit	O
,	O
1GB	O
to	O
2GB	O
of	O
the	O
random-access	B-Architecture
memory	I-Architecture
(	O
RAM	B-Architecture
)	O
depending	O
on	O
the	O
configuration	O
;	O
for	O
64-bit	B-Device
,	O
75%	O
up	O
to	O
a	O
maximum	O
of	O
128GB	O
.	O
</s>
<s>
SchedulingOne	O
scheduler	O
is	O
used	O
across	O
all	O
real-time	O
processors	B-General_Concept
(	O
SMP	O
architecture	O
)	O
.	O
</s>
<s>
It	O
uses	O
priority-driven	O
(	O
128	O
real-time	O
priorities	O
)	O
and	O
pre-emptive	O
algorithms	O
to	O
ensure	O
critical	O
thread	O
context	B-Operating_System
switches	I-Operating_System
.	O
</s>
<s>
Priority	O
promotion	O
mechanisms	O
are	O
provided	O
to	O
avoid	O
priority	B-Operating_System
inversion	I-Operating_System
.	O
</s>
<s>
Communicating	O
with	O
Windows	O
occurs	O
via	O
RTX	B-Operating_System
providing	O
common	O
inter-process	B-Operating_System
communication	I-Operating_System
(	O
IPC	O
)	O
mechanisms	O
between	O
real-time	O
processes	O
and	O
Windows	O
processes	O
(	O
user	O
processes	O
or	O
kernel	O
drivers	O
)	O
.	O
</s>
<s>
Synchronizing	O
is	O
done	O
via	O
events	O
,	O
mutexes	B-Operating_System
and	O
semaphores	B-Operating_System
;	O
data	O
sharing	O
via	O
shared	B-Operating_System
memory	I-Operating_System
or	O
socket	B-Protocol
communication	O
.	O
</s>
<s>
Real	O
time	O
application	O
developmentRTX	O
application	O
development	O
is	O
done	O
from	O
Microsoft	B-Application
Visual	I-Application
Studio	I-Application
in	O
C	B-Language
or	O
C++	B-Language
using	O
a	O
windows-like	O
application	B-Application
programming	I-Application
interface	I-Application
(	O
API	B-Application
)	O
.	O
</s>
<s>
RTX	B-Operating_System
executable	O
are	O
.rtss	O
and	O
DLLs	O
are	O
.rtdll	O
.	O
</s>
<s>
Network	O
communicationThe	O
RTX	B-Operating_System
real-time	O
TCP/IP	B-Protocol
stack	I-Protocol
(	O
RT-TCP/IP	O
)	O
supports	O
TCP	B-Protocol
,	O
UDP	B-Protocol
,	O
and	O
IP	B-Protocol
for	O
IPv4	B-Protocol
and	O
IPv6	B-Protocol
.	O
</s>
<s>
RTX	B-Operating_System
drivers	O
for	O
standard	O
network	B-Protocol
interface	I-Protocol
controllers	I-Protocol
(	O
NICs	O
)	O
are	O
provided	O
with	O
the	O
stack	O
.	O
</s>
