Edit File: kthread.h
#ifndef _LINUX_KTHREAD_H #define _LINUX_KTHREAD_H /* Simple interface for creating and stopping kernel threads without mess. */ #include <linux/err.h> #include <linux/sched.h> __printf(4, 5) struct task_struct *kthread_create_on_node(int (*threadfn)(void *data), void *data, int node, const char namefmt[], ...); #define kthread_create(threadfn, data, namefmt, arg...) \ kthread_create_on_node(threadfn, data, -1, namefmt, ##arg) struct task_struct *kthread_create_on_cpu(int (*threadfn)(void *data), void *data, unsigned int cpu, const char *namefmt); /** * 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; \ }) void kthread_bind(struct task_struct *k, unsigned int cpu); int kthread_stop(struct task_struct *k); bool kthread_should_stop(void); bool kthread_should_park(void); bool kthread_freezable_should_stop(bool *was_frozen); void *kthread_data(struct task_struct *k); void *probe_kthread_data(struct task_struct *k); int kthread_park(struct task_struct *k); void kthread_unpark(struct task_struct *k); void kthread_parkme(void); int kthreadd(void *unused); extern struct task_struct *kthreadd_task; extern int tsk_fork_get_node(struct task_struct *tsk); /* * Simple work processor based on kthread. * * This provides easier way to make use of kthreads. A kthread_work * can be queued and flushed using queue/flush_kthread_work() * respectively. Queued kthread_works are processed by a kthread * running kthread_worker_fn(). */ struct kthread_work; typedef void (*kthread_work_func_t)(struct kthread_work *work); struct kthread_worker { spinlock_t lock; struct list_head work_list; struct task_struct *task; struct kthread_work *current_work; }; struct kthread_work { struct list_head node; kthread_work_func_t func; wait_queue_head_t done; struct kthread_worker *worker; }; #define KTHREAD_WORKER_INIT(worker) { \ .lock = __SPIN_LOCK_UNLOCKED((worker).lock), \ .work_list = LIST_HEAD_INIT((worker).work_list), \ } #define KTHREAD_WORK_INIT(work, fn) { \ .node = LIST_HEAD_INIT((work).node), \ .func = (fn), \ .done = __WAIT_QUEUE_HEAD_INITIALIZER((work).done), \ } #define DEFINE_KTHREAD_WORKER(worker) \ struct kthread_worker worker = KTHREAD_WORKER_INIT(worker) #define DEFINE_KTHREAD_WORK(work, fn) \ struct kthread_work work = KTHREAD_WORK_INIT(work, fn) /* * kthread_worker.lock and kthread_work.done need their own lockdep class * keys if they are defined on stack with lockdep enabled. Use the * following macros when defining them on stack. */ #ifdef CONFIG_LOCKDEP # define KTHREAD_WORKER_INIT_ONSTACK(worker) \ ({ init_kthread_worker(&worker); worker; }) # define DEFINE_KTHREAD_WORKER_ONSTACK(worker) \ struct kthread_worker worker = KTHREAD_WORKER_INIT_ONSTACK(worker) # define KTHREAD_WORK_INIT_ONSTACK(work, fn) \ ({ init_kthread_work((&work), fn); work; }) # define DEFINE_KTHREAD_WORK_ONSTACK(work, fn) \ struct kthread_work work = KTHREAD_WORK_INIT_ONSTACK(work, fn) #else # define DEFINE_KTHREAD_WORKER_ONSTACK(worker) DEFINE_KTHREAD_WORKER(worker) # define DEFINE_KTHREAD_WORK_ONSTACK(work, fn) DEFINE_KTHREAD_WORK(work, fn) #endif extern void __init_kthread_worker(struct kthread_worker *worker, const char *name, struct lock_class_key *key); #define init_kthread_worker(worker) \ do { \ static struct lock_class_key __key; \ __init_kthread_worker((worker), "("#worker")->lock", &__key); \ } while (0) #define init_kthread_work(work, fn) \ do { \ memset((work), 0, sizeof(struct kthread_work)); \ INIT_LIST_HEAD(&(work)->node); \ (work)->func = (fn); \ init_waitqueue_head(&(work)->done); \ } while (0) int kthread_worker_fn(void *worker_ptr); bool queue_kthread_work(struct kthread_worker *worker, struct kthread_work *work); void flush_kthread_work(struct kthread_work *work); void flush_kthread_worker(struct kthread_worker *worker); #endif /* _LINUX_KTHREAD_H */