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;
80 /* Number of canceling calls that are running at the moment. */
84 struct kthread_delayed_work {
85 struct kthread_work work;
86 struct timer_list timer;
89 #define KTHREAD_WORKER_INIT(worker) { \
90 .lock = __SPIN_LOCK_UNLOCKED((worker).lock), \
91 .work_list = LIST_HEAD_INIT((worker).work_list), \
92 .delayed_work_list = LIST_HEAD_INIT((worker).delayed_work_list),\
95 #define KTHREAD_WORK_INIT(work, fn) { \
96 .node = LIST_HEAD_INIT((work).node), \
100 #define KTHREAD_DELAYED_WORK_INIT(dwork, fn) { \
101 .work = KTHREAD_WORK_INIT((dwork).work, (fn)), \
102 .timer = __TIMER_INITIALIZER(kthread_delayed_work_timer_fn, \
103 0, (unsigned long)&(dwork), \
107 #define DEFINE_KTHREAD_WORKER(worker) \
108 struct kthread_worker worker = KTHREAD_WORKER_INIT(worker)
110 #define DEFINE_KTHREAD_WORK(work, fn) \
111 struct kthread_work work = KTHREAD_WORK_INIT(work, fn)
113 #define DEFINE_KTHREAD_DELAYED_WORK(dwork, fn) \
114 struct kthread_delayed_work dwork = \
115 KTHREAD_DELAYED_WORK_INIT(dwork, fn)
118 * kthread_worker.lock needs its own lockdep class key when defined on
119 * stack with lockdep enabled. Use the following macros in such cases.
121 #ifdef CONFIG_LOCKDEP
122 # define KTHREAD_WORKER_INIT_ONSTACK(worker) \
123 ({ kthread_init_worker(&worker); worker; })
124 # define DEFINE_KTHREAD_WORKER_ONSTACK(worker) \
125 struct kthread_worker worker = KTHREAD_WORKER_INIT_ONSTACK(worker)
127 # define DEFINE_KTHREAD_WORKER_ONSTACK(worker) DEFINE_KTHREAD_WORKER(worker)
130 extern void __kthread_init_worker(struct kthread_worker *worker,
131 const char *name, struct lock_class_key *key);
133 #define kthread_init_worker(worker) \
135 static struct lock_class_key __key; \
136 __kthread_init_worker((worker), "("#worker")->lock", &__key); \
139 #define kthread_init_work(work, fn) \
141 memset((work), 0, sizeof(struct kthread_work)); \
142 INIT_LIST_HEAD(&(work)->node); \
143 (work)->func = (fn); \
146 #define kthread_init_delayed_work(dwork, fn) \
148 kthread_init_work(&(dwork)->work, (fn)); \
149 __setup_timer(&(dwork)->timer, \
150 kthread_delayed_work_timer_fn, \
151 (unsigned long)(dwork), \
155 int kthread_worker_fn(void *worker_ptr);
158 struct kthread_worker *
159 kthread_create_worker(const char namefmt[], ...);
161 struct kthread_worker *
162 kthread_create_worker_on_cpu(int cpu, const char namefmt[], ...);
164 bool kthread_queue_work(struct kthread_worker *worker,
165 struct kthread_work *work);
167 bool kthread_queue_delayed_work(struct kthread_worker *worker,
168 struct kthread_delayed_work *dwork,
169 unsigned long delay);
171 void kthread_flush_work(struct kthread_work *work);
172 void kthread_flush_worker(struct kthread_worker *worker);
174 bool kthread_cancel_work_sync(struct kthread_work *work);
175 bool kthread_cancel_delayed_work_sync(struct kthread_delayed_work *work);
177 void kthread_destroy_worker(struct kthread_worker *worker);
179 #endif /* _LINUX_KTHREAD_H */