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• Source document: kernel/process_management/kthread.md

• Translation time: 2025-05-19 01:41:23

• Translation model: Qwen/Qwen3-8B

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kthread Kernel Threads

  The kernel thread module is implemented in process/kthread.rs, providing support for kernel threads and related functionalities. Kernel threads act as the “avatars” of the kernel, enhancing the system’s parallelism and fault tolerance capabilities.

Principles

  Each kernel thread runs in kernel mode, executing its specific tasks.

  The creation of a kernel thread is achieved by calling the KernelThreadMechanism::create() or KernelThreadMechanism::create_and_run() function, which sends a creation task to the kthreadd daemon thread. In other words, the creation of a kernel thread is ultimately handled by kthread_daemon.

  After a kernel thread is created, it defaults to a sleeping state. To wake it up, the ProcessManager::wakeup function should be used.

  When other kernel modules wish to stop a kernel thread, they can call the KernelThreadMechanism::stop() function to wait for the thread to exit, then obtain the return value and clean up the thread’s PCB (Process Control Block).

  Kernel threads should frequently check the result of KernelThreadMechanism::should_stop() to determine whether they should exit. When it is detected that the thread needs to exit, it can return a return code to terminate itself. (Note: resource cleanup is important)