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#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 */
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