如何在rmmod上停止Linux内核线程？
我编写了以下代码来创建内核线程：
#include #include #include #include #include struct task_struct *task; int data; int ret; int thread_function(void *data) { int var; var = 10; return var; } static int kernel_init(void) { data = 20; printk(KERN_INFO"--------------------------------------------"); task = kthread_create(&thread_function,(void *)data,"pradeep"); task = kthread_run(&thread_function,(void *)data,"pradeep"); printk(KERN_INFO"Kernel Thread : %s\n",task->comm); return 0; } static void kernel_exit(void) { ret = kthread_stop(task); } module_init(kernel_init); module_exit(kernel_exit); 在给出insmod命令后，我能够创建一个名为“pradeep”的内核线程，我可以使用ps -ef命令查看新线程，如下所示
root 6071 2 0 10:21 ? 00:00:00 [pradeep]
并且它的父级是kthreadd，其PID为2.但是我无法在给出rmmod命令时停止此线程。 它提供以下输出：
ERROR: Removing 'pradeep': Device or resource busy.
有人可以告诉我如何杀死这个post？
您应该只使用kthread_create()或kthread_run() ：
/** * kthread_run - create and wake a thread. * @threadfn: the function to run until signal_pending(current). * @data: data ptr for @threadfn. * @namefmt: printf-style name for the thread. * * Description: Convenient wrapper for kthread_create() followed by * wake_up_process(). Returns the kthread or ERR_PTR(-ENOMEM). */ #define kthread_run(threadfn, data, namefmt, ...) \ ({ \ struct task_struct *__k \ = kthread_create(threadfn, data, namefmt, ## __VA_ARGS__); \ if (!IS_ERR(__k)) \ wake_up_process(__k); \ __k; \ })
所以你要创建两个线程并泄漏其中一个：
task = kthread_create(&thread_function,(void*) &data,"pradeep"); task = kthread_run(&thread_function,(void*) &data,"pradeep");
此外，您的线程函数可能缺少一些细节：
/** * kthread_create - create a kthread. * @threadfn: the function to run until signal_pending(current). * @data: data ptr for @threadfn. * @namefmt: printf-style name for the thread. * * Description: This helper function creates and names a kernel * thread. The thread will be stopped: use wake_up_process() to start * it. See also kthread_run(). * * When woken, the thread will run @threadfn() with @data as its * argument. @threadfn() can either call do_exit() directly if it is a * standalone thread for which noone will call kthread_stop(), or * return when 'kthread_should_stop()' is true (which means * kthread_stop() has been called). The return value should be zero * or a negative error number; it will be passed to kthread_stop(). * * Returns a task_struct or ERR_PTR(-ENOMEM). */
我认为终止线程的两个选择是：
- 完成后调用
do_exit()。 - 当另一个线程调用
kthread_stop()时返回一个值。
希望在解决这两个小问题之后，你将拥有一个function线程创建者/收割者。
我希望下面的程序解决你的问题….竖起大拇指:-)
`#include #include #include #include #include` struct task_struct *task; int data; int ret; int thread_function(void *data) { int var; var = 10; printk(KERN_INFO "IN THREAD FUNCTION"); while(!kthread_should_stop()){ schedule(); } /*do_exit(1);*/ return var; } static int kernel_init(void) { data = 20; printk(KERN_INFO"--------------------------------------------"); /*task = kthread_create(&thread_function,(void *)data,"pradeep");*/ task = kthread_run(&thread_function,(void *)data,"pradeep"); printk(KERN_INFO"Kernel Thread : %s\n",task->comm); return 0; } static void kernel_exit(void) { kthread_stop(task); } module_init(kernel_init); module_exit(kernel_exit); MODULE_AUTHOR("SHRQ"); MODULE_LICENSE("GPL");
在代码中你不需要使用kthread_create api，因为kthread_run在内部执行它。使用其中之一
task = kthread_create（＆thread_function，（void *）data，“pradeep”）;
要么
task = kthread_run（＆thread_function，（void *）data，“pradeep”）;
此外，您的模块不受GPL许可。 这可能是您的问题的一个原因。