128 lines
3.9 KiB
C
128 lines
3.9 KiB
C
#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)
|
|
|
|
/*
|
|
* 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 */
|