1
2#ifndef _LINUX_KTHREAD_H
3#define _LINUX_KTHREAD_H
4
5#include <linux/err.h>
6#include <linux/sched.h>
7
8struct mm_struct;
9
10__printf(4, 5)
11struct task_struct *kthread_create_on_node(int (*threadfn)(void *data),
12 void *data,
13 int node,
14 const char namefmt[], ...);
15
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24
25
26
27#define kthread_create(threadfn, data, namefmt, arg...) \
28 kthread_create_on_node(threadfn, data, NUMA_NO_NODE, namefmt, ##arg)
29
30
31struct task_struct *kthread_create_on_cpu(int (*threadfn)(void *data),
32 void *data,
33 unsigned int cpu,
34 const char *namefmt);
35
36void set_kthread_struct(struct task_struct *p);
37
38void kthread_set_per_cpu(struct task_struct *k, int cpu);
39bool kthread_is_per_cpu(struct task_struct *k);
40
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47
48
49
50#define kthread_run(threadfn, data, namefmt, ...) \
51({ \
52 struct task_struct *__k \
53 = kthread_create(threadfn, data, namefmt, ## __VA_ARGS__); \
54 if (!IS_ERR(__k)) \
55 wake_up_process(__k); \
56 __k; \
57})
58
59void free_kthread_struct(struct task_struct *k);
60void kthread_bind(struct task_struct *k, unsigned int cpu);
61void kthread_bind_mask(struct task_struct *k, const struct cpumask *mask);
62int kthread_stop(struct task_struct *k);
63bool kthread_should_stop(void);
64bool kthread_should_park(void);
65bool __kthread_should_park(struct task_struct *k);
66bool kthread_freezable_should_stop(bool *was_frozen);
67void *kthread_func(struct task_struct *k);
68void *kthread_data(struct task_struct *k);
69void *kthread_probe_data(struct task_struct *k);
70int kthread_park(struct task_struct *k);
71void kthread_unpark(struct task_struct *k);
72void kthread_parkme(void);
73
74int kthreadd(void *unused);
75extern struct task_struct *kthreadd_task;
76extern int tsk_fork_get_node(struct task_struct *tsk);
77
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83
84
85
86struct kthread_work;
87typedef void (*kthread_work_func_t)(struct kthread_work *work);
88void kthread_delayed_work_timer_fn(struct timer_list *t);
89
90enum {
91 KTW_FREEZABLE = 1 << 0,
92};
93
94struct kthread_worker {
95 unsigned int flags;
96 raw_spinlock_t lock;
97 struct list_head work_list;
98 struct list_head delayed_work_list;
99 struct task_struct *task;
100 struct kthread_work *current_work;
101};
102
103struct kthread_work {
104 struct list_head node;
105 kthread_work_func_t func;
106 struct kthread_worker *worker;
107
108 int canceling;
109};
110
111struct kthread_delayed_work {
112 struct kthread_work work;
113 struct timer_list timer;
114};
115
116#define KTHREAD_WORKER_INIT(worker) { \
117 .lock = __RAW_SPIN_LOCK_UNLOCKED((worker).lock), \
118 .work_list = LIST_HEAD_INIT((worker).work_list), \
119 .delayed_work_list = LIST_HEAD_INIT((worker).delayed_work_list),\
120 }
121
122#define KTHREAD_WORK_INIT(work, fn) { \
123 .node = LIST_HEAD_INIT((work).node), \
124 .func = (fn), \
125 }
126
127#define KTHREAD_DELAYED_WORK_INIT(dwork, fn) { \
128 .work = KTHREAD_WORK_INIT((dwork).work, (fn)), \
129 .timer = __TIMER_INITIALIZER(kthread_delayed_work_timer_fn,\
130 TIMER_IRQSAFE), \
131 }
132
133#define DEFINE_KTHREAD_WORKER(worker) \
134 struct kthread_worker worker = KTHREAD_WORKER_INIT(worker)
135
136#define DEFINE_KTHREAD_WORK(work, fn) \
137 struct kthread_work work = KTHREAD_WORK_INIT(work, fn)
138
139#define DEFINE_KTHREAD_DELAYED_WORK(dwork, fn) \
140 struct kthread_delayed_work dwork = \
141 KTHREAD_DELAYED_WORK_INIT(dwork, fn)
142
143
144
145
146
147#ifdef CONFIG_LOCKDEP
148# define KTHREAD_WORKER_INIT_ONSTACK(worker) \
149 ({ kthread_init_worker(&worker); worker; })
150# define DEFINE_KTHREAD_WORKER_ONSTACK(worker) \
151 struct kthread_worker worker = KTHREAD_WORKER_INIT_ONSTACK(worker)
152#else
153# define DEFINE_KTHREAD_WORKER_ONSTACK(worker) DEFINE_KTHREAD_WORKER(worker)
154#endif
155
156extern void __kthread_init_worker(struct kthread_worker *worker,
157 const char *name, struct lock_class_key *key);
158
159#define kthread_init_worker(worker) \
160 do { \
161 static struct lock_class_key __key; \
162 __kthread_init_worker((worker), "("#worker")->lock", &__key); \
163 } while (0)
164
165#define kthread_init_work(work, fn) \
166 do { \
167 memset((work), 0, sizeof(struct kthread_work)); \
168 INIT_LIST_HEAD(&(work)->node); \
169 (work)->func = (fn); \
170 } while (0)
171
172#define kthread_init_delayed_work(dwork, fn) \
173 do { \
174 kthread_init_work(&(dwork)->work, (fn)); \
175 timer_setup(&(dwork)->timer, \
176 kthread_delayed_work_timer_fn, \
177 TIMER_IRQSAFE); \
178 } while (0)
179
180int kthread_worker_fn(void *worker_ptr);
181
182__printf(2, 3)
183struct kthread_worker *
184kthread_create_worker(unsigned int flags, const char namefmt[], ...);
185
186__printf(3, 4) struct kthread_worker *
187kthread_create_worker_on_cpu(int cpu, unsigned int flags,
188 const char namefmt[], ...);
189
190bool kthread_queue_work(struct kthread_worker *worker,
191 struct kthread_work *work);
192
193bool kthread_queue_delayed_work(struct kthread_worker *worker,
194 struct kthread_delayed_work *dwork,
195 unsigned long delay);
196
197bool kthread_mod_delayed_work(struct kthread_worker *worker,
198 struct kthread_delayed_work *dwork,
199 unsigned long delay);
200
201void kthread_flush_work(struct kthread_work *work);
202void kthread_flush_worker(struct kthread_worker *worker);
203
204bool kthread_cancel_work_sync(struct kthread_work *work);
205bool kthread_cancel_delayed_work_sync(struct kthread_delayed_work *work);
206
207void kthread_destroy_worker(struct kthread_worker *worker);
208
209void kthread_use_mm(struct mm_struct *mm);
210void kthread_unuse_mm(struct mm_struct *mm);
211
212struct cgroup_subsys_state;
213
214#ifdef CONFIG_BLK_CGROUP
215void kthread_associate_blkcg(struct cgroup_subsys_state *css);
216struct cgroup_subsys_state *kthread_blkcg(void);
217#else
218static inline void kthread_associate_blkcg(struct cgroup_subsys_state *css) { }
219static inline struct cgroup_subsys_state *kthread_blkcg(void)
220{
221 return NULL;
222}
223#endif
224#endif
225