<s>
ChorusOS	B-Operating_System
is	O
a	O
microkernel	B-Operating_System
real-time	B-Operating_System
operating	I-Operating_System
system	I-Operating_System
designed	O
as	O
a	O
message	B-Architecture
passing	I-Architecture
computing	O
model	O
.	O
</s>
<s>
ChorusOS	B-Operating_System
began	O
as	O
the	O
Chorus	O
distributed	B-Operating_System
real-time	B-Operating_System
operating	I-Operating_System
system	I-Operating_System
research	O
project	O
at	O
the	O
French	O
Institute	O
for	O
Research	O
in	O
Computer	O
Science	O
and	O
Automation	O
(	O
INRIA	O
)	O
in	O
1979	O
.	O
</s>
<s>
During	O
the	O
1980s	O
,	O
Chorus	O
was	O
one	O
of	O
two	O
earliest	O
microkernels	B-Operating_System
(	O
the	O
other	O
being	O
Mach	B-Operating_System
)	O
and	O
was	O
developed	O
commercially	O
by	O
startup	O
company	O
Chorus	O
Systèmes	O
SA	O
.	O
</s>
<s>
Over	O
time	O
,	O
development	O
effort	O
shifted	O
away	O
from	O
distribution	O
aspects	O
to	O
real-time	B-General_Concept
for	O
embedded	B-Architecture
systems	I-Architecture
.	O
</s>
<s>
In	O
1997	O
,	O
Sun	O
Microsystems	O
acquired	O
Chorus	O
Systèmes	O
for	O
its	O
microkernel	B-Operating_System
technology	O
,	O
which	O
went	O
toward	O
the	O
new	O
JavaOS	B-Application
.	O
</s>
<s>
Sun	O
(	O
and	O
henceforth	O
Oracle	O
)	O
no	O
longer	O
supports	O
ChorusOS	B-Operating_System
.	O
</s>
<s>
VirtualLogix	O
designed	O
embedded	B-Architecture
systems	I-Architecture
using	O
Linux	B-Application
and	O
ChorusOS	B-Operating_System
(	O
which	O
they	O
named	O
VirtualLogix	O
C5	O
)	O
.	O
</s>
<s>
C5	O
was	O
described	O
by	O
them	O
as	O
a	O
carrier	O
grade	O
operating	B-General_Concept
system	I-General_Concept
,	O
and	O
was	O
actively	O
maintained	O
by	O
them	O
.	O
</s>
<s>
The	O
latest	O
source	O
tree	O
of	O
ChorusOS	B-Operating_System
,	O
an	O
evolution	O
of	O
version	O
5.0	O
,	O
was	O
released	O
as	O
open-source	B-Application
software	I-Application
by	O
Sun	O
and	O
is	O
available	O
at	O
the	O
Sun	O
Download	O
Center	O
.	O
</s>
<s>
Jaluna-1	O
is	O
described	O
there	O
as	O
a	O
real-time	B-General_Concept
Portable	O
Operating	B-General_Concept
System	I-General_Concept
Interface	O
(	O
RT-POSIX	O
)	O
layer	O
based	O
on	O
FreeBSD	B-Operating_System
4.1	O
,	O
and	O
the	O
CDE	O
cross-platform	B-Operating_System
software	I-Operating_System
development	O
environment	O
.	O
</s>
<s>
ChorusOS	B-Operating_System
is	O
supported	O
by	O
popular	O
Secure	B-Protocol
Socket	I-Protocol
Layer	I-Protocol
and	O
Transport	B-Protocol
Layer	I-Protocol
Security	I-Protocol
(	O
SSL/TLS	B-Protocol
)	O
libraries	B-Library
such	O
as	O
wolfSSL	B-Protocol
.	O
</s>
