1 #ifndef _LINUX_KTHREAD_H
2 #define _LINUX_KTHREAD_H
3 /* Simple interface for creating and stopping kernel threads without mess. */
5 #include <linux/sched.h>
8 struct task_struct
*kthread_create_on_node(int (*threadfn
)(void *data
),
11 const char namefmt
[], ...);
13 #define kthread_create(threadfn, data, namefmt, arg...) \
14 kthread_create_on_node(threadfn, data, NUMA_NO_NODE, namefmt, ##arg)
17 struct task_struct
*kthread_create_on_cpu(int (*threadfn
)(void *data
),
23 * kthread_run - create and wake a thread.
24 * @threadfn: the function to run until signal_pending(current).
25 * @data: data ptr for @threadfn.
26 * @namefmt: printf-style name for the thread.
28 * Description: Convenient wrapper for kthread_create() followed by
29 * wake_up_process(). Returns the kthread or ERR_PTR(-ENOMEM).
31 #define kthread_run(threadfn, data, namefmt, ...) \
33 struct task_struct *__k \
34 = kthread_create(threadfn, data, namefmt, ## __VA_ARGS__); \
36 wake_up_process(__k); \
40 void kthread_bind(struct task_struct
*k
, unsigned int cpu
);
41 void kthread_bind_mask(struct task_struct
*k
, const struct cpumask
*mask
);
42 int kthread_stop(struct task_struct
*k
);
43 bool kthread_should_stop(void);
44 bool kthread_should_park(void);
45 bool kthread_freezable_should_stop(bool *was_frozen
);
46 void *kthread_data(struct task_struct
*k
);
47 void *kthread_probe_data(struct task_struct
*k
);
48 int kthread_park(struct task_struct
*k
);
49 void kthread_unpark(struct task_struct
*k
);
50 void kthread_parkme(void);
52 int kthreadd(void *unused
);
53 extern struct task_struct
*kthreadd_task
;
54 extern int tsk_fork_get_node(struct task_struct
*tsk
);
57 * Simple work processor based on kthread.
59 * This provides easier way to make use of kthreads. A kthread_work
60 * can be queued and flushed using queue/kthread_flush_work()
61 * respectively. Queued kthread_works are processed by a kthread
62 * running kthread_worker_fn().
65 typedef void (*kthread_work_func_t
)(struct kthread_work
*work
);
66 void kthread_delayed_work_timer_fn(unsigned long __data
);
68 struct kthread_worker
{
70 struct list_head work_list
;
71 struct list_head delayed_work_list
;
72 struct task_struct
*task
;
73 struct kthread_work
*current_work
;
77 struct list_head node
;
78 kthread_work_func_t func
;
79 struct kthread_worker
*worker
;
82 struct kthread_delayed_work
{
83 struct kthread_work work
;
84 struct timer_list timer
;
87 #define KTHREAD_WORKER_INIT(worker) { \
88 .lock = __SPIN_LOCK_UNLOCKED((worker).lock), \
89 .work_list = LIST_HEAD_INIT((worker).work_list), \
90 .delayed_work_list = LIST_HEAD_INIT((worker).delayed_work_list),\
93 #define KTHREAD_WORK_INIT(work, fn) { \
94 .node = LIST_HEAD_INIT((work).node), \
98 #define KTHREAD_DELAYED_WORK_INIT(dwork, fn) { \
99 .work = KTHREAD_WORK_INIT((dwork).work, (fn)), \
100 .timer = __TIMER_INITIALIZER(kthread_delayed_work_timer_fn, \
101 0, (unsigned long)&(dwork), \
105 #define DEFINE_KTHREAD_WORKER(worker) \
106 struct kthread_worker worker = KTHREAD_WORKER_INIT(worker)
108 #define DEFINE_KTHREAD_WORK(work, fn) \
109 struct kthread_work work = KTHREAD_WORK_INIT(work, fn)
111 #define DEFINE_KTHREAD_DELAYED_WORK(dwork, fn) \
112 struct kthread_delayed_work dwork = \
113 KTHREAD_DELAYED_WORK_INIT(dwork, fn)
116 * kthread_worker.lock needs its own lockdep class key when defined on
117 * stack with lockdep enabled. Use the following macros in such cases.
119 #ifdef CONFIG_LOCKDEP
120 # define KTHREAD_WORKER_INIT_ONSTACK(worker) \
121 ({ kthread_init_worker(&worker); worker; })
122 # define DEFINE_KTHREAD_WORKER_ONSTACK(worker) \
123 struct kthread_worker worker = KTHREAD_WORKER_INIT_ONSTACK(worker)
125 # define DEFINE_KTHREAD_WORKER_ONSTACK(worker) DEFINE_KTHREAD_WORKER(worker)
128 extern void __kthread_init_worker(struct kthread_worker
*worker
,
129 const char *name
, struct lock_class_key
*key
);
131 #define kthread_init_worker(worker) \
133 static struct lock_class_key __key; \
134 __kthread_init_worker((worker), "("#worker")->lock", &__key); \
137 #define kthread_init_work(work, fn) \
139 memset((work), 0, sizeof(struct kthread_work)); \
140 INIT_LIST_HEAD(&(work)->node); \
141 (work)->func = (fn); \
144 #define kthread_init_delayed_work(dwork, fn) \
146 kthread_init_work(&(dwork)->work, (fn)); \
147 __setup_timer(&(dwork)->timer, \
148 kthread_delayed_work_timer_fn, \
149 (unsigned long)(dwork), \
153 int kthread_worker_fn(void *worker_ptr
);
156 struct kthread_worker
*
157 kthread_create_worker(const char namefmt
[], ...);
159 struct kthread_worker
*
160 kthread_create_worker_on_cpu(int cpu
, const char namefmt
[], ...);
162 bool kthread_queue_work(struct kthread_worker
*worker
,
163 struct kthread_work
*work
);
165 bool kthread_queue_delayed_work(struct kthread_worker
*worker
,
166 struct kthread_delayed_work
*dwork
,
167 unsigned long delay
);
169 void kthread_flush_work(struct kthread_work
*work
);
170 void kthread_flush_worker(struct kthread_worker
*worker
);
172 void kthread_destroy_worker(struct kthread_worker
*worker
);
174 #endif /* _LINUX_KTHREAD_H */