<s>
The	O
room	B-Operating_System
synchronization	I-Operating_System
technique	O
is	O
a	O
form	O
of	O
concurrency	B-Operating_System
control	I-Operating_System
in	O
computer	B-General_Concept
science	I-General_Concept
.	O
</s>
<s>
The	O
room	B-Operating_System
synchronization	I-Operating_System
problem	O
involves	O
supporting	O
a	O
set	O
of	O
m	O
mutually	O
exclusive	O
"	O
rooms	O
"	O
where	O
any	O
number	O
of	O
users	O
can	O
execute	O
code	O
simultaneously	O
in	O
a	O
shared	O
room	O
(	O
any	O
one	O
of	O
them	O
)	O
,	O
but	O
no	O
two	O
users	O
can	O
simultaneously	O
execute	O
code	O
in	O
separate	O
rooms	O
.	O
</s>
<s>
Room	B-Operating_System
synchronization	I-Operating_System
can	O
be	O
used	O
to	O
implement	O
asynchronous	O
parallel	O
queues	O
and	O
stacks	O
with	O
constant	O
time	O
access	O
(	O
assuming	O
a	O
fetch-and-add	B-Operating_System
operation	O
)	O
.	O
</s>
