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1da177e4 LT |
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 | ||
1da177e4 LT |
7 | struct task_struct *kthread_create(int (*threadfn)(void *data), |
8 | void *data, | |
ed9559d3 RR |
9 | const char namefmt[], ...) |
10 | __attribute__((format(printf, 3, 4))); | |
1da177e4 LT |
11 | |
12 | /** | |
9e37bd30 | 13 | * kthread_run - create and wake a thread. |
1da177e4 LT |
14 | * @threadfn: the function to run until signal_pending(current). |
15 | * @data: data ptr for @threadfn. | |
16 | * @namefmt: printf-style name for the thread. | |
17 | * | |
18 | * Description: Convenient wrapper for kthread_create() followed by | |
9e37bd30 RD |
19 | * wake_up_process(). Returns the kthread or ERR_PTR(-ENOMEM). |
20 | */ | |
1da177e4 LT |
21 | #define kthread_run(threadfn, data, namefmt, ...) \ |
22 | ({ \ | |
23 | struct task_struct *__k \ | |
24 | = kthread_create(threadfn, data, namefmt, ## __VA_ARGS__); \ | |
25 | if (!IS_ERR(__k)) \ | |
26 | wake_up_process(__k); \ | |
27 | __k; \ | |
28 | }) | |
29 | ||
1da177e4 | 30 | void kthread_bind(struct task_struct *k, unsigned int cpu); |
1da177e4 | 31 | int kthread_stop(struct task_struct *k); |
1da177e4 | 32 | int kthread_should_stop(void); |
82805ab7 | 33 | void *kthread_data(struct task_struct *k); |
1da177e4 | 34 | |
73c27992 EB |
35 | int kthreadd(void *unused); |
36 | extern struct task_struct *kthreadd_task; | |
37 | ||
b56c0d89 TH |
38 | /* |
39 | * Simple work processor based on kthread. | |
40 | * | |
41 | * This provides easier way to make use of kthreads. A kthread_work | |
42 | * can be queued and flushed using queue/flush_kthread_work() | |
43 | * respectively. Queued kthread_works are processed by a kthread | |
44 | * running kthread_worker_fn(). | |
45 | * | |
46 | * A kthread_work can't be freed while it is executing. | |
47 | */ | |
48 | struct kthread_work; | |
49 | typedef void (*kthread_work_func_t)(struct kthread_work *work); | |
50 | ||
51 | struct kthread_worker { | |
52 | spinlock_t lock; | |
53 | struct list_head work_list; | |
54 | struct task_struct *task; | |
55 | }; | |
56 | ||
57 | struct kthread_work { | |
58 | struct list_head node; | |
59 | kthread_work_func_t func; | |
60 | wait_queue_head_t done; | |
61 | atomic_t flushing; | |
62 | int queue_seq; | |
63 | int done_seq; | |
64 | }; | |
65 | ||
66 | #define KTHREAD_WORKER_INIT(worker) { \ | |
67 | .lock = SPIN_LOCK_UNLOCKED, \ | |
68 | .work_list = LIST_HEAD_INIT((worker).work_list), \ | |
69 | } | |
70 | ||
71 | #define KTHREAD_WORK_INIT(work, fn) { \ | |
72 | .node = LIST_HEAD_INIT((work).node), \ | |
73 | .func = (fn), \ | |
74 | .done = __WAIT_QUEUE_HEAD_INITIALIZER((work).done), \ | |
75 | .flushing = ATOMIC_INIT(0), \ | |
76 | } | |
77 | ||
78 | #define DEFINE_KTHREAD_WORKER(worker) \ | |
79 | struct kthread_worker worker = KTHREAD_WORKER_INIT(worker) | |
80 | ||
81 | #define DEFINE_KTHREAD_WORK(work, fn) \ | |
82 | struct kthread_work work = KTHREAD_WORK_INIT(work, fn) | |
83 | ||
4f32e9b1 YZ |
84 | /* |
85 | * kthread_worker.lock and kthread_work.done need their own lockdep class | |
86 | * keys if they are defined on stack with lockdep enabled. Use the | |
87 | * following macros when defining them on stack. | |
88 | */ | |
89 | #ifdef CONFIG_LOCKDEP | |
90 | # define KTHREAD_WORKER_INIT_ONSTACK(worker) \ | |
91 | ({ init_kthread_worker(&worker); worker; }) | |
92 | # define DEFINE_KTHREAD_WORKER_ONSTACK(worker) \ | |
93 | struct kthread_worker worker = KTHREAD_WORKER_INIT_ONSTACK(worker) | |
94 | # define KTHREAD_WORK_INIT_ONSTACK(work, fn) \ | |
95 | ({ init_kthread_work((&work), fn); work; }) | |
96 | # define DEFINE_KTHREAD_WORK_ONSTACK(work, fn) \ | |
97 | struct kthread_work work = KTHREAD_WORK_INIT_ONSTACK(work, fn) | |
98 | #else | |
99 | # define DEFINE_KTHREAD_WORKER_ONSTACK(worker) DEFINE_KTHREAD_WORKER(worker) | |
100 | # define DEFINE_KTHREAD_WORK_ONSTACK(work, fn) DEFINE_KTHREAD_WORK(work, fn) | |
101 | #endif | |
102 | ||
103 | extern void __init_kthread_worker(struct kthread_worker *worker, | |
104 | const char *name, struct lock_class_key *key); | |
105 | ||
106 | #define init_kthread_worker(worker) \ | |
107 | do { \ | |
108 | static struct lock_class_key __key; \ | |
109 | __init_kthread_worker((worker), "("#worker")->lock", &__key); \ | |
110 | } while (0) | |
111 | ||
112 | #define init_kthread_work(work, fn) \ | |
113 | do { \ | |
114 | memset((work), 0, sizeof(struct kthread_work)); \ | |
115 | INIT_LIST_HEAD(&(work)->node); \ | |
116 | (work)->func = (fn); \ | |
117 | init_waitqueue_head(&(work)->done); \ | |
118 | } while (0) | |
b56c0d89 TH |
119 | |
120 | int kthread_worker_fn(void *worker_ptr); | |
121 | ||
122 | bool queue_kthread_work(struct kthread_worker *worker, | |
123 | struct kthread_work *work); | |
124 | void flush_kthread_work(struct kthread_work *work); | |
125 | void flush_kthread_worker(struct kthread_worker *worker); | |
126 | ||
1da177e4 | 127 | #endif /* _LINUX_KTHREAD_H */ |