<s>
In	O
computer	B-General_Concept
science	I-General_Concept
,	O
a	O
timestamp-based	B-Operating_System
concurrency	I-Operating_System
control	I-Operating_System
algorithm	O
is	O
a	O
non-lock	O
concurrency	O
control	O
method	O
.	O
</s>
<s>
If	O
then	O
skip	O
(	O
the	O
Thomas	B-General_Concept
Write	I-General_Concept
Rule	I-General_Concept
)	O
,	O
</s>
<s>
Note	O
that	O
timestamp	B-Operating_System
ordering	I-Operating_System
in	O
its	O
basic	O
form	O
does	O
not	O
produce	O
recoverable	O
histories	O
.	O
</s>
