Thread control block

Thread Control Block (TCB) is a data structure in an operating system kernel that contains thread-specific information needed to manage the thread. The TCB is "the manifestation of a thread in an operating system." Each thread has a thread control block. An operating system keeps track of the thread control blocks in kernel memory. 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 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 threads in a system. Specific information is stored in the thread control block highlighting important information about each process.

This article needs additional citations for verification. Please help improve this article by adding citations to reliable sources. Unsourced material may be challenged and removed. Find sources: "Thread control block" – news · newspapers · books · scholar · JSTOR (September 2023) (Learn how and when to remove this message)

Thread Control Block (TCB) is a data structure in an operating system kernel that contains thread-specific information needed to manage the thread.^[1] The TCB is "the manifestation of a thread in an operating system."

Each thread has a thread control block. An operating system keeps track of the thread control blocks in kernel memory.^[2]

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 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 threads in a system. Specific information is stored in the thread control block highlighting important information about each process.

See also

[edit]

• Parallel Thread Execution
• Process control block (PCB)
• Thread Environment Block (TEB)
• Thread-local storage (TLS)

References

[edit]

1. ^ "Thread Control Block in Operating System". GeeksforGeeks. 2019-11-26. Retrieved 2023-09-04.
2. ^ "CS162 - Fall 2014 #7 - Kernel Threads". inst.eecs.berkeley.edu. Archived from the original on 2023-12-07. Retrieved 2023-12-07.