<s>
Thread	B-Operating_System
Control	I-Operating_System
Block	I-Operating_System
(	O
TCB	O
)	O
is	O
a	O
data	B-General_Concept
structure	I-General_Concept
in	O
the	O
operating	B-Operating_System
system	I-Operating_System
kernel	I-Operating_System
which	O
contains	O
thread-specific	O
information	O
needed	O
to	O
manage	O
it	O
.	O
</s>
<s>
The	O
TCB	O
is	O
"	O
the	O
manifestation	O
of	O
a	O
thread	B-Operating_System
in	O
an	O
operating	O
system.	O
"	O
</s>
<s>
The	O
Thread	B-Operating_System
Control	I-Operating_System
Block	I-Operating_System
acts	O
as	O
a	O
library	O
of	O
information	O
about	O
the	O
threads	B-Operating_System
in	O
a	O
system	O
.	O
</s>
<s>
Specific	O
information	O
is	O
stored	O
in	O
the	O
thread	B-Operating_System
control	I-Operating_System
block	I-Operating_System
highlighting	O
important	O
information	O
about	O
each	O
process	O
.	O
</s>
