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What is a Thread? List the advantages of using a Thread?
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Thread

  • A thread is also called a Lightweight Process.
  • Each thread belongs to exactly one process and no thread can exist outside a process.
  • But, one process can contain multiple threads.
  • Each thread represents a separate flow of control, thread is a path of execution within a process.
  • A thread is a flow of execution through the process code, with its program counter that keeps track of which instruction to execute next, system registers that hold its current working variables, and a stack that contains the execution history.
  • Threads are generally used to improve the application through Parallelism.
  • In the operating system, there are two types of threads:
    • Kernel-level Thread
    • User-level Thread
  • Advantages of a thread depending on the type of thread.

Let's see the advantages of threads according to their types.

Advantages of Kernel-level Thread:

  • Multiple threads of the same process can be scheduled on different processors.
  • The routines of the kernel can also be multithreaded.
  • If a kernel-level thread is blocked, another thread of the same process can be scheduled by the kernel.
  • These threads are fully aware of all other threads.
  • Hence, Scheduler may decide to give more time to a process having a large number of threads than a process having a small number of threads. -These threads are good for applications that frequently block.

Advantages of User-level Thread:

  • Implementing threads at user space is easier and faster to create than threads at the kernel level.
  • They can also be more easily managed.
  • These threads can be run on any operating system.
  • It does not need any support from the kernel-level threads.
  • The overall process is quick and effective because there is no requirement for a system call.
  • No need for the kernel-mode privileges for the thread to switch in userspace.
  • The organization is straightforward because the threads are produced, switched, and controlled without interference from the kernel.
  • Do not require modification to operating systems.
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