<s>
The	O
State	B-Application
Threads	I-Application
library	B-Library
is	O
a	O
small	O
application	O
library	B-Library
which	O
provides	O
a	O
foundation	O
for	O
writing	O
fast	O
and	O
highly	O
scalable	O
Internet	O
applications	O
(	O
such	O
as	O
web	B-Application
servers	I-Application
,	O
proxy	O
servers	O
,	O
mail	B-Protocol
transfer	I-Protocol
agents	I-Protocol
,	O
or	O
any	O
network-data-driven	O
application	O
)	O
on	O
Unix-like	B-Operating_System
platforms	O
.	O
</s>
<s>
This	O
library	B-Library
combines	O
the	O
simplicity	O
of	O
the	O
multithreaded	O
programming	O
paradigm	O
,	O
in	O
which	O
one	O
thread	O
supports	O
each	O
simultaneous	O
connection	O
,	O
with	O
the	O
performance	O
and	O
scalability	O
of	O
an	O
event-driven	O
state	O
machine	O
architecture	O
.	O
</s>
<s>
In	O
other	O
words	O
,	O
this	O
library	B-Library
offers	O
a	O
threading	O
API	B-Application
for	O
structuring	O
an	O
Internet	O
application	O
as	O
a	O
state	O
machine	O
.	O
</s>
<s>
The	O
State	B-Application
Threads	I-Application
library	B-Library
is	O
a	O
derivative	O
of	O
the	O
Netscape	B-Application
Portable	I-Application
Runtime	I-Application
library	B-Library
(	O
NSPR	B-Application
)	O
and	O
therefore	O
is	O
distributed	O
under	O
the	O
Mozilla	B-License
Public	I-License
License	I-License
(	O
MPL	B-License
)	O
version	O
1.1	O
or	O
the	O
GNU	B-License
General	I-License
Public	I-License
License	I-License
(	O
GPL	B-License
)	O
version	O
2	O
or	O
later	O
.	O
</s>
