<s>
GNU	B-Application
Pth	I-Application
(	O
Portable	O
Threads	B-Operating_System
)	O
is	O
a	O
POSIX/ANSI	O
-C	O
based	O
user	B-Operating_System
space	I-Operating_System
thread	I-Operating_System
library	O
for	O
UNIX	B-Application
platforms	O
that	O
provides	O
priority-based	O
scheduling	O
for	O
multithreading	B-Operating_System
applications	O
.	O
</s>
<s>
GNU	B-Application
Pth	I-Application
targets	O
for	O
a	O
high	O
degree	O
of	O
portability	B-Architecture
.	O
</s>
<s>
It	O
is	O
part	O
of	O
the	B-Application
GNU	I-Application
Project	I-Application
.	O
</s>
<s>
Pth	O
also	O
provides	O
API	B-Application
emulation	O
for	O
POSIX	B-Operating_System
threads	I-Operating_System
for	O
backward	O
compatibility	O
.	O
</s>
<s>
GNU	B-Application
Pth	I-Application
uses	O
an	O
N:1	O
mapping	O
to	O
kernel-space	B-Operating_System
threads	B-Operating_System
,	O
i.e.	O
,	O
the	O
scheduling	O
is	O
done	O
completely	O
by	O
the	O
GNU	B-Application
Pth	I-Application
library	O
and	O
the	O
kernel	O
itself	O
is	O
not	O
aware	O
of	O
the	O
N	O
threads	B-Operating_System
in	O
user-space	B-Operating_System
.	O
</s>
<s>
Because	O
of	O
this	O
there	O
is	O
no	O
possibility	O
to	O
utilize	O
SMP	B-Operating_System
as	O
kernel	O
dispatching	O
would	O
be	O
necessary	O
.	O
</s>
