<s>
DCEThreads	B-Protocol
is	O
an	O
implementation	O
of	O
POSIX	O
Draft	O
4	O
threads	O
.	O
</s>
<s>
DCE	O
Stands	O
for	O
"	O
Distributed	O
Computing	O
Environment	O
"	O
DCEThreads	B-Protocol
allowed	O
users	O
to	O
create	O
multiple	O
avenues	O
of	O
execution	O
in	O
a	O
single	O
process	O
.	O
</s>
<s>
DCE/RPC	B-General_Concept
was	O
under	O
development	O
,	O
but	O
the	O
POSIX	O
committee	O
had	O
not	O
finalised	O
POSIX	O
threads	O
at	O
the	O
time	O
.	O
</s>
<s>
The	B-Application
Open	I-Application
Group	I-Application
had	O
to	O
make	O
a	O
decision	O
about	O
which	O
to	O
use	O
,	O
and	O
the	O
final	O
POSIX	O
threads	O
were	O
different	O
from	O
their	O
selection	O
.	O
</s>
<s>
Microsoft	O
adopted	O
DCE/RPC	B-General_Concept
wholesale	O
in	O
Windows	O
NT	O
as	O
MSRPC	B-General_Concept
and	O
also	O
in	O
DCOM	B-Operating_System
.	O
</s>
<s>
Most	O
of	O
the	O
stability	O
and	O
reliability	O
problems	O
that	O
programmers	O
associate	O
with	O
DCOM	B-Operating_System
services	O
-	O
especially	O
memory	B-Error_Name
leaks	I-Error_Name
,	O
exception	O
handling	O
problems	O
and	O
thread	O
cancellation	O
stability	O
issues	O
-	O
can	O
be	O
traced	O
back	O
to	O
the	O
use	O
of	O
POSIX	O
Draft	O
4	O
threads	O
.	O
</s>
<s>
DCE/RPC	B-General_Concept
is	O
sufficiently	O
complex	O
that	O
the	O
issue	O
of	O
updating	O
it	O
to	O
solve	O
and	O
modernise	O
the	O
POSIX	O
Draft	O
4	O
threading	O
problem	O
requires	O
highly	O
skilled	O
and	O
highly	O
specific	O
programming	O
knowledge	O
.	O
</s>
<s>
Consequently	O
,	O
despite	O
its	O
capacities	O
,	O
the	O
reference	O
implementation	O
of	O
DCE/RPC	B-General_Concept
has	O
been	O
held	O
up	O
due	O
to	O
a	O
lack	O
of	O
information	O
and	O
resources	O
.	O
</s>
<s>
DCE/RPC	B-General_Concept
utilises	O
thread	O
cancellation	O
to	O
propagate	O
signals	O
across	O
the	O
"	O
Remote	O
"	O
of	O
RPC	O
,	O
such	O
that	O
for	O
example	O
a	O
client	O
application	O
terminating	O
a	O
thread	O
results	O
in	O
its	O
corresponding	O
thread	O
on	O
the	O
server	O
also	O
being	O
terminated	O
in	O
the	O
same	O
way	O
.	O
</s>
<s>
DCEThreads	B-Protocol
now	O
only	O
realistically	O
exists	O
as	O
an	O
emulation	O
layer	O
.	O
</s>
