Root/
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 | __printf(4, 5) |
8 | struct task_struct *kthread_create_on_node(int (*threadfn)(void *data), |
9 | void *data, |
10 | int node, |
11 | const char namefmt[], ...); |
12 | |
13 | #define kthread_create(threadfn, data, namefmt, arg...) \ |
14 | kthread_create_on_node(threadfn, data, -1, namefmt, ##arg) |
15 | |
16 | |
17 | struct task_struct *kthread_create_on_cpu(int (*threadfn)(void *data), |
18 | void *data, |
19 | unsigned int cpu, |
20 | const char *namefmt); |
21 | |
22 | /** |
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. |
27 | * |
28 | * Description: Convenient wrapper for kthread_create() followed by |
29 | * wake_up_process(). Returns the kthread or ERR_PTR(-ENOMEM). |
30 | */ |
31 | #define kthread_run(threadfn, data, namefmt, ...) \ |
32 | ({ \ |
33 | struct task_struct *__k \ |
34 | = kthread_create(threadfn, data, namefmt, ## __VA_ARGS__); \ |
35 | if (!IS_ERR(__k)) \ |
36 | wake_up_process(__k); \ |
37 | __k; \ |
38 | }) |
39 | |
40 | void kthread_bind(struct task_struct *k, unsigned int cpu); |
41 | int kthread_stop(struct task_struct *k); |
42 | bool kthread_should_stop(void); |
43 | bool kthread_should_park(void); |
44 | bool kthread_freezable_should_stop(bool *was_frozen); |
45 | void *kthread_data(struct task_struct *k); |
46 | void *probe_kthread_data(struct task_struct *k); |
47 | int kthread_park(struct task_struct *k); |
48 | void kthread_unpark(struct task_struct *k); |
49 | void kthread_parkme(void); |
50 | |
51 | int kthreadd(void *unused); |
52 | extern struct task_struct *kthreadd_task; |
53 | extern int tsk_fork_get_node(struct task_struct *tsk); |
54 | |
55 | /* |
56 | * Simple work processor based on kthread. |
57 | * |
58 | * This provides easier way to make use of kthreads. A kthread_work |
59 | * can be queued and flushed using queue/flush_kthread_work() |
60 | * respectively. Queued kthread_works are processed by a kthread |
61 | * running kthread_worker_fn(). |
62 | */ |
63 | struct kthread_work; |
64 | typedef void (*kthread_work_func_t)(struct kthread_work *work); |
65 | |
66 | struct kthread_worker { |
67 | spinlock_t lock; |
68 | struct list_head work_list; |
69 | struct task_struct *task; |
70 | struct kthread_work *current_work; |
71 | }; |
72 | |
73 | struct kthread_work { |
74 | struct list_head node; |
75 | kthread_work_func_t func; |
76 | wait_queue_head_t done; |
77 | struct kthread_worker *worker; |
78 | }; |
79 | |
80 | #define KTHREAD_WORKER_INIT(worker) { \ |
81 | .lock = __SPIN_LOCK_UNLOCKED((worker).lock), \ |
82 | .work_list = LIST_HEAD_INIT((worker).work_list), \ |
83 | } |
84 | |
85 | #define KTHREAD_WORK_INIT(work, fn) { \ |
86 | .node = LIST_HEAD_INIT((work).node), \ |
87 | .func = (fn), \ |
88 | .done = __WAIT_QUEUE_HEAD_INITIALIZER((work).done), \ |
89 | } |
90 | |
91 | #define DEFINE_KTHREAD_WORKER(worker) \ |
92 | struct kthread_worker worker = KTHREAD_WORKER_INIT(worker) |
93 | |
94 | #define DEFINE_KTHREAD_WORK(work, fn) \ |
95 | struct kthread_work work = KTHREAD_WORK_INIT(work, fn) |
96 | |
97 | /* |
98 | * kthread_worker.lock and kthread_work.done need their own lockdep class |
99 | * keys if they are defined on stack with lockdep enabled. Use the |
100 | * following macros when defining them on stack. |
101 | */ |
102 | #ifdef CONFIG_LOCKDEP |
103 | # define KTHREAD_WORKER_INIT_ONSTACK(worker) \ |
104 | ({ init_kthread_worker(&worker); worker; }) |
105 | # define DEFINE_KTHREAD_WORKER_ONSTACK(worker) \ |
106 | struct kthread_worker worker = KTHREAD_WORKER_INIT_ONSTACK(worker) |
107 | # define KTHREAD_WORK_INIT_ONSTACK(work, fn) \ |
108 | ({ init_kthread_work((&work), fn); work; }) |
109 | # define DEFINE_KTHREAD_WORK_ONSTACK(work, fn) \ |
110 | struct kthread_work work = KTHREAD_WORK_INIT_ONSTACK(work, fn) |
111 | #else |
112 | # define DEFINE_KTHREAD_WORKER_ONSTACK(worker) DEFINE_KTHREAD_WORKER(worker) |
113 | # define DEFINE_KTHREAD_WORK_ONSTACK(work, fn) DEFINE_KTHREAD_WORK(work, fn) |
114 | #endif |
115 | |
116 | extern void __init_kthread_worker(struct kthread_worker *worker, |
117 | const char *name, struct lock_class_key *key); |
118 | |
119 | #define init_kthread_worker(worker) \ |
120 | do { \ |
121 | static struct lock_class_key __key; \ |
122 | __init_kthread_worker((worker), "("#worker")->lock", &__key); \ |
123 | } while (0) |
124 | |
125 | #define init_kthread_work(work, fn) \ |
126 | do { \ |
127 | memset((work), 0, sizeof(struct kthread_work)); \ |
128 | INIT_LIST_HEAD(&(work)->node); \ |
129 | (work)->func = (fn); \ |
130 | init_waitqueue_head(&(work)->done); \ |
131 | } while (0) |
132 | |
133 | int kthread_worker_fn(void *worker_ptr); |
134 | |
135 | bool queue_kthread_work(struct kthread_worker *worker, |
136 | struct kthread_work *work); |
137 | void flush_kthread_work(struct kthread_work *work); |
138 | void flush_kthread_worker(struct kthread_worker *worker); |
139 | |
140 | #endif /* _LINUX_KTHREAD_H */ |
141 |
Branches:
ben-wpan
ben-wpan-stefan
javiroman/ks7010
jz-2.6.34
jz-2.6.34-rc5
jz-2.6.34-rc6
jz-2.6.34-rc7
jz-2.6.35
jz-2.6.36
jz-2.6.37
jz-2.6.38
jz-2.6.39
jz-3.0
jz-3.1
jz-3.11
jz-3.12
jz-3.13
jz-3.15
jz-3.16
jz-3.18-dt
jz-3.2
jz-3.3
jz-3.4
jz-3.5
jz-3.6
jz-3.6-rc2-pwm
jz-3.9
jz-3.9-clk
jz-3.9-rc8
jz47xx
jz47xx-2.6.38
master
Tags:
od-2011-09-04
od-2011-09-18
v2.6.34-rc5
v2.6.34-rc6
v2.6.34-rc7
v3.9