<s>
Such	O
languages	O
provide	O
synchronization	O
constructs	O
whose	O
behavior	O
is	O
defined	O
by	O
a	O
parallel	O
execution	B-Device
model	I-Device
.	O
</s>
<s>
A	O
concurrent	B-Architecture
programming	I-Architecture
language	O
is	O
defined	O
as	O
one	O
which	O
uses	O
the	O
concept	O
of	O
simultaneously	O
executing	O
processes	O
or	O
threads	O
of	O
execution	O
as	O
a	O
means	O
of	O
structuring	O
a	O
program	O
.	O
</s>
<s>
Both	O
types	O
are	O
listed	O
,	O
as	O
concurrency	B-Application
is	O
a	O
useful	O
tool	O
in	O
expressing	O
parallelism	O
,	O
but	O
it	O
is	O
not	O
necessary	O
.	O
</s>
<s>
In	O
both	O
cases	O
,	O
the	O
features	O
must	O
be	O
part	O
of	O
the	O
language	O
syntax	O
and	O
not	O
an	O
extension	O
such	O
as	O
a	O
library	O
(	O
libraries	O
such	O
as	O
the	O
posix-thread	O
library	O
implement	O
a	O
parallel	O
execution	B-Device
model	I-Device
but	O
lack	O
the	O
syntax	O
and	O
grammar	O
required	O
to	O
be	O
a	O
programming	O
language	O
)	O
.	O
</s>
<s>
Oz	B-Language
-	O
Multi-paradigm	O
language	O
with	O
particular	O
support	O
for	O
constraint	O
and	O
distributed	O
programming	O
.	O
</s>
<s>
Fork	O
–	O
programming	O
language	O
for	O
the	O
PRAM	B-Operating_System
model	O
.	O
</s>
<s>
Join	B-Language
Java	I-Language
-	O
A	O
Java-based	O
language	O
with	O
features	O
from	O
the	O
join-calculus	B-Language
.	O
</s>
<s>
Ateji	B-Language
PX	I-Language
-	O
An	O
extension	O
of	O
Java	B-Language
with	O
parallel	O
primitives	O
inspired	O
from	O
pi-calculus	O
.	O
</s>
<s>
Axum	B-Language
-	O
a	O
domain-specific	O
language	O
being	O
developed	O
by	O
Microsoft	O
.	O
</s>
