<s>
Real-time	B-Application
application	I-Application
interface	I-Application
(	O
RTAI	B-Application
)	O
is	O
a	O
real-time	B-General_Concept
extension	O
for	O
the	O
Linux	B-Operating_System
kernel	I-Operating_System
,	O
which	O
lets	O
users	O
write	O
applications	O
with	O
strict	O
timing	O
constraints	O
for	O
Linux	B-Operating_System
.	O
</s>
<s>
Like	O
Linux	B-Operating_System
itself	O
the	O
RTAI	B-Application
software	O
is	O
a	O
community	O
effort	O
.	O
</s>
<s>
RTAI	B-Application
provides	O
deterministic	O
response	O
to	O
interrupts	O
,	O
POSIX-compliant	O
and	O
native	O
RTAI	B-Application
real-time	B-General_Concept
tasks	O
.	O
</s>
<s>
RTAI	B-Application
supports	O
several	O
architectures	O
,	O
including	O
IA-32	B-Device
(	O
with	O
and	O
without	O
FPU	B-General_Concept
and	O
TSC	B-Device
)	O
,	O
x86-64	B-Device
,	O
PowerPC	B-Architecture
,	O
ARM	B-Architecture
(	O
StrongARM	B-Device
and	O
ARM7	O
:	O
clps711x-family	O
,	O
Cirrus	O
Logic	O
EP7xxx	O
,	O
CS89712	O
,	O
PXA25x	O
)	O
,	O
and	O
MIPS	B-Device
.	O
</s>
<s>
RTAI	B-Application
consists	O
mainly	O
of	O
two	O
parts	O
:	O
an	O
Adeos-based	O
patch	O
to	O
the	O
Linux	B-Operating_System
kernel	I-Operating_System
which	O
introduces	O
a	O
hardware	O
abstraction	O
layer	O
,	O
and	O
a	O
broad	O
variety	O
of	O
services	O
which	O
make	O
lives	O
of	O
real-time	B-General_Concept
programmers	O
easier	O
.	O
</s>
<s>
RTAI	B-Application
versions	O
over	O
3.0	O
use	O
an	O
Adeos	B-Operating_System
kernel	B-Operating_System
patch	O
,	O
slightly	O
modified	O
in	O
the	O
x86	O
architecture	O
case	O
,	O
providing	O
additional	O
abstraction	O
and	O
much	O
lessened	O
dependencies	O
on	O
the	O
"	O
patched	O
"	O
operating	O
system	O
.	O
</s>
<s>
Adeos	B-Operating_System
is	O
a	O
kernel	B-Operating_System
patch	O
comprising	O
an	O
Interrupt	O
Pipeline	O
where	O
different	O
operating	O
system	O
domains	O
register	O
interrupt	O
handlers	O
.	O
</s>
<s>
This	O
way	O
,	O
RTAI	B-Application
can	O
transparently	O
take	O
over	O
interrupts	O
while	O
leaving	O
the	O
processing	O
of	O
all	O
others	O
to	O
Linux	B-Operating_System
.	O
</s>
<s>
Use	O
of	O
Adeos	B-Operating_System
also	O
frees	O
RTAI	B-Application
from	O
patent	O
restrictions	O
caused	O
by	O
RTLinux	B-Application
project	O
.	O
</s>
<s>
RTAI-XML	B-Application
is	O
a	O
server	O
component	O
of	O
RTAI	B-Application
,	O
implementing	O
a	O
service-oriented	O
way	O
to	O
design	O
and	O
develop	O
real-time	B-General_Concept
(	O
RT	O
)	O
control	O
applications	O
.	O
</s>
<s>
Leaving	O
the	O
first	O
wishful	O
thinking	O
and	O
going	O
to	O
the	O
real	O
implementation	O
gave	O
rise	O
to	O
the	O
alpha	O
version	O
of	O
RTAI-XML	B-Application
,	O
that	O
showed	O
the	O
potential	O
impact	O
of	O
the	O
basic	O
idea	O
of	O
a	O
net	O
separation	O
of	O
hard	O
and	O
soft	O
real-time	B-General_Concept
tasks	O
in	O
the	O
programmation	O
logic	O
.	O
</s>
<s>
What	O
was	O
necessary	O
to	O
assure	O
that	O
students	O
could	O
not	O
crash	O
the	O
RT	O
process	O
,	O
is	O
now	O
becoming	O
a	O
new	O
RTAI	B-Application
paradigm	O
.	O
</s>
<s>
RTAI-XML	B-Application
consists	O
of	O
a	O
server	O
component	O
waiting	O
for	O
incoming	O
calls	O
on	O
a	O
box	O
where	O
a	O
real-time	B-General_Concept
process	O
,	O
the	O
Target	O
,	O
is	O
running	O
(	O
or	O
ready	O
to	O
)	O
.	O
</s>
<s>
A	O
generic	O
client	O
program	O
,	O
the	O
Host	O
,	O
can	O
reach	O
the	O
server	O
through	O
the	O
TCP/IP	B-Protocol
network	I-Protocol
,	O
using	O
a	O
standard	O
protocol	O
based	O
on	O
XML	B-Protocol
,	O
and	O
hence	O
interact	O
with	O
the	O
Target	O
,	O
in	O
order	O
to	O
monitor	O
the	O
status	O
of	O
the	O
RT	O
process	O
,	O
to	O
see	O
the	O
signals	O
collected	O
(	O
or	O
generated	O
)	O
by	O
the	O
system	O
and	O
also	O
to	O
fetch	O
and	O
change	O
the	O
RT	O
parameters	O
(	O
for	O
example	O
,	O
the	O
gains	O
of	O
a	O
PID	O
feedback	O
ring	O
)	O
.	O
</s>
<s>
In	O
other	O
words	O
,	O
RTAI-XML	B-Application
provides	O
a	O
simple	O
way	O
towards	O
remoting	B-Operating_System
of	O
control	O
applications	O
,	O
adding	O
flexibility	O
to	O
the	O
RTAI	B-Application
project	O
,	O
without	O
losing	O
the	O
key	O
features	O
of	O
an	O
open	O
and	O
standard	O
implementation	O
.	O
</s>
<s>
The	O
RTAI-XML	B-Application
section	O
of	O
this	O
site	O
presents	O
the	O
details	O
of	O
the	O
implementation	O
.	O
</s>
<s>
The	O
Applications	O
section	O
contains	O
some	O
examples	O
of	O
control	O
systems	O
based	O
on	O
RTAI-XML	B-Application
and	O
the	O
References	O
section	O
contains	O
hints	O
and	O
links	O
for	O
further	O
readings	O
on	O
this	O
topic	O
.	O
</s>
