Thread control block: Difference between revisions

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{{More citations needed|date=September 2023}}

'''Thread Control Block''' ('''TCB''') is a [[data structure]] in thean [[operating system kernel]] whichthat contains [[Thread (computing)|thread]]-specific information needed to manage itthe thread.<ref>{{Cite web |date=2019-11-26 |title=Thread Control Block in Operating System |url=https://www.geeksforgeeks.org/thread-control-block-in-operating-system/ |access-date=2023-09-04 |website=GeeksforGeeks |language=en-us}}</ref> The TCB is "the manifestation of a thread in an operating system"."

{{Multiple issues|{{unreferenced|date=February 2013}}}}

Each thread has a thread control block. An operating system keeps track of the thread control blocks in kernel memory.<ref>{{Cite web |title=CS162 - Fall 2014 #7 - Kernel Threads|url=https://inst.eecs.berkeley.edu/~cs162/fa14// |access-date=2023-12-07 |website=inst.eecs.berkeley.edu|archive-url=https://web.archive.org/web/20231207231258/https://inst.eecs.berkeley.edu/~cs162/fa14//|archive-date=2023-12-07|url-status=unfit}}</ref>

'''Thread Control Block''' (TCB) is a [[data structure]] in the [[operating system kernel]] which contains [[Thread (computing)|thread]]-specific information needed to manage it. The TCB is "the manifestation of a thread in an operating system".

An example of information contained within a TCB is:

* Thread Identifier: Unique id (tid) is assigned to every new thread

* [[Stack pointer]]: Points to thread's stack in the process

* [[Program counter]]: Points to the current program instruction of the thread

* State of the thread (running, ready, waiting, start, done)

* Thread's [[Processor register|register]] values

* Pointer to the [[Process control block]] (PCB) of the process that the thread lives on

The Thread Control Block acts as a library of information about the [[Thread (computing)|threads]] in a system. Specific information is stored in the thread control block highlighting important information about each process.

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* [[Parallel Thread Execution]]

* [[Process control block]] (PCB)

* [[Thread Environment Block]] (TEB)

== References ==

{{Reflist}}

[[Category:Operating system kernels]]