#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> struct task_struct *kthread_create(int (*threadfn)(void *data), void *data, const char namefmt[], ...) __attribute__((format(printf, 3, 4))); /** * 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); int kthread_should_stop(void); void *kthread_data(struct task_struct *k); int kthreadd(void *unused); extern struct task_struct *kthreadd_task; /* * 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(). * * A kthread_work can't be freed while it is executing. */ 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 { struct list_head node; kthread_work_func_t func; wait_queue_head_t done; atomic_t flushing; int queue_seq; int done_seq; }; #define KTHREAD_WORKER_INIT(worker) { \ .lock = SPIN_LOCK_UNLOCKED, \ .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), \ .flushing = ATOMIC_INIT(0), \ } #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) static inline void init_kthread_worker(struct kthread_worker *worker) { *worker = (struct kthread_worker)KTHREAD_WORKER_INIT(*worker); } static inline void init_kthread_work(struct kthread_work *work, kthread_work_func_t fn) { *work = (struct kthread_work)KTHREAD_WORK_INIT(*work, fn); } 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 */