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1 | #ifndef _LINUX_KTHREAD_H |
2 | #define _LINUX_KTHREAD_H |
3 | /* Simple interface for creating and stopping kernel threads without mess. */ |
4 | #include <linux/err.h> |
5 | #include <linux/sched.h> |
6 | |
7 | struct task_struct *kthread_create_on_node(int (*threadfn)(void *data), |
8 | void *data, |
9 | int node, |
10 | const char namefmt[], ...) |
11 | __attribute__((format(printf, 4, 5))); |
12 | |
13 | #define kthread_create(threadfn, data, namefmt, arg...) \ |
14 | kthread_create_on_node(threadfn, data, -1, namefmt, ##arg) |
15 | |
16 | |
17 | /** |
18 | * kthread_run - create and wake a thread. |
19 | * @threadfn: the function to run until signal_pending(current). |
20 | * @data: data ptr for @threadfn. |
21 | * @namefmt: printf-style name for the thread. |
22 | * |
23 | * Description: Convenient wrapper for kthread_create() followed by |
24 | * wake_up_process(). Returns the kthread or ERR_PTR(-ENOMEM). |
25 | */ |
26 | #define kthread_run(threadfn, data, namefmt, ...) \ |
27 | ({ \ |
28 | struct task_struct *__k \ |
29 | = kthread_create(threadfn, data, namefmt, ## __VA_ARGS__); \ |
30 | if (!IS_ERR(__k)) \ |
31 | wake_up_process(__k); \ |
32 | __k; \ |
33 | }) |
34 | |
35 | void kthread_bind(struct task_struct *k, unsigned int cpu); |
36 | int kthread_stop(struct task_struct *k); |
37 | int kthread_should_stop(void); |
38 | void *kthread_data(struct task_struct *k); |
39 | |
40 | int kthreadd(void *unused); |
41 | extern struct task_struct *kthreadd_task; |
42 | extern int tsk_fork_get_node(struct task_struct *tsk); |
43 | |
44 | /* |
45 | * Simple work processor based on kthread. |
46 | * |
47 | * This provides easier way to make use of kthreads. A kthread_work |
48 | * can be queued and flushed using queue/flush_kthread_work() |
49 | * respectively. Queued kthread_works are processed by a kthread |
50 | * running kthread_worker_fn(). |
51 | * |
52 | * A kthread_work can't be freed while it is executing. |
53 | */ |
54 | struct kthread_work; |
55 | typedef void (*kthread_work_func_t)(struct kthread_work *work); |
56 | |
57 | struct kthread_worker { |
58 | spinlock_t lock; |
59 | struct list_head work_list; |
60 | struct task_struct *task; |
61 | }; |
62 | |
63 | struct kthread_work { |
64 | struct list_head node; |
65 | kthread_work_func_t func; |
66 | wait_queue_head_t done; |
67 | atomic_t flushing; |
68 | int queue_seq; |
69 | int done_seq; |
70 | }; |
71 | |
72 | #define KTHREAD_WORKER_INIT(worker) { \ |
73 | .lock = __SPIN_LOCK_UNLOCKED((worker).lock), \ |
74 | .work_list = LIST_HEAD_INIT((worker).work_list), \ |
75 | } |
76 | |
77 | #define KTHREAD_WORK_INIT(work, fn) { \ |
78 | .node = LIST_HEAD_INIT((work).node), \ |
79 | .func = (fn), \ |
80 | .done = __WAIT_QUEUE_HEAD_INITIALIZER((work).done), \ |
81 | .flushing = ATOMIC_INIT(0), \ |
82 | } |
83 | |
84 | #define DEFINE_KTHREAD_WORKER(worker) \ |
85 | struct kthread_worker worker = KTHREAD_WORKER_INIT(worker) |
86 | |
87 | #define DEFINE_KTHREAD_WORK(work, fn) \ |
88 | struct kthread_work work = KTHREAD_WORK_INIT(work, fn) |
89 | |
90 | /* |
91 | * kthread_worker.lock and kthread_work.done need their own lockdep class |
92 | * keys if they are defined on stack with lockdep enabled. Use the |
93 | * following macros when defining them on stack. |
94 | */ |
95 | #ifdef CONFIG_LOCKDEP |
96 | # define KTHREAD_WORKER_INIT_ONSTACK(worker) \ |
97 | ({ init_kthread_worker(&worker); worker; }) |
98 | # define DEFINE_KTHREAD_WORKER_ONSTACK(worker) \ |
99 | struct kthread_worker worker = KTHREAD_WORKER_INIT_ONSTACK(worker) |
100 | # define KTHREAD_WORK_INIT_ONSTACK(work, fn) \ |
101 | ({ init_kthread_work((&work), fn); work; }) |
102 | # define DEFINE_KTHREAD_WORK_ONSTACK(work, fn) \ |
103 | struct kthread_work work = KTHREAD_WORK_INIT_ONSTACK(work, fn) |
104 | #else |
105 | # define DEFINE_KTHREAD_WORKER_ONSTACK(worker) DEFINE_KTHREAD_WORKER(worker) |
106 | # define DEFINE_KTHREAD_WORK_ONSTACK(work, fn) DEFINE_KTHREAD_WORK(work, fn) |
107 | #endif |
108 | |
109 | extern void __init_kthread_worker(struct kthread_worker *worker, |
110 | const char *name, struct lock_class_key *key); |
111 | |
112 | #define init_kthread_worker(worker) \ |
113 | do { \ |
114 | static struct lock_class_key __key; \ |
115 | __init_kthread_worker((worker), "("#worker")->lock", &__key); \ |
116 | } while (0) |
117 | |
118 | #define init_kthread_work(work, fn) \ |
119 | do { \ |
120 | memset((work), 0, sizeof(struct kthread_work)); \ |
121 | INIT_LIST_HEAD(&(work)->node); \ |
122 | (work)->func = (fn); \ |
123 | init_waitqueue_head(&(work)->done); \ |
124 | } while (0) |
125 | |
126 | int kthread_worker_fn(void *worker_ptr); |
127 | |
128 | bool queue_kthread_work(struct kthread_worker *worker, |
129 | struct kthread_work *work); |
130 | void flush_kthread_work(struct kthread_work *work); |
131 | void flush_kthread_worker(struct kthread_worker *worker); |
132 | |
133 | #endif /* _LINUX_KTHREAD_H */ |
134 |
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