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[linux-2.6.git] / include / linux / workqueue.h
1 /*
2  * workqueue.h --- work queue handling for Linux.
3  */
4
5 #ifndef _LINUX_WORKQUEUE_H
6 #define _LINUX_WORKQUEUE_H
7
8 #include <linux/timer.h>
9 #include <linux/linkage.h>
10 #include <linux/bitops.h>
11
12 struct workqueue_struct;
13
14 struct work_struct {
15         unsigned long pending;
16         struct list_head entry;
17         void (*func)(void *);
18         void *data;
19         void *wq_data;
20         struct timer_list timer;
21 };
22
23 #define __WORK_INITIALIZER(n, f, d) {                           \
24         .entry  = { &(n).entry, &(n).entry },                   \
25         .func = (f),                                            \
26         .data = (d),                                            \
27         .timer = TIMER_INITIALIZER(NULL, 0, 0),                 \
28         }
29
30 #define DECLARE_WORK(n, f, d)                                   \
31         struct work_struct n = __WORK_INITIALIZER(n, f, d)
32
33 /*
34  * initialize a work-struct's func and data pointers:
35  */
36 #define PREPARE_WORK(_work, _func, _data)                       \
37         do {                                                    \
38                 (_work)->func = _func;                          \
39                 (_work)->data = _data;                          \
40         } while (0)
41
42 /*
43  * initialize all of a work-struct:
44  */
45 #define INIT_WORK(_work, _func, _data)                          \
46         do {                                                    \
47                 INIT_LIST_HEAD(&(_work)->entry);                \
48                 (_work)->pending = 0;                           \
49                 PREPARE_WORK((_work), (_func), (_data));        \
50                 init_timer(&(_work)->timer);                    \
51         } while (0)
52
53 extern struct workqueue_struct *__create_workqueue(const char *name,
54                                                     int singlethread);
55 #define create_workqueue(name) __create_workqueue((name), 0)
56 #define create_singlethread_workqueue(name) __create_workqueue((name), 1)
57
58 extern void destroy_workqueue(struct workqueue_struct *wq);
59
60 extern int FASTCALL(queue_work(struct workqueue_struct *wq, struct work_struct *work));
61 extern int FASTCALL(queue_delayed_work(struct workqueue_struct *wq, struct work_struct *work, unsigned long delay));
62 extern void FASTCALL(flush_workqueue(struct workqueue_struct *wq));
63
64 extern int FASTCALL(schedule_work(struct work_struct *work));
65 extern int FASTCALL(schedule_delayed_work(struct work_struct *work, unsigned long delay));
66
67 extern int schedule_delayed_work_on(int cpu, struct work_struct *work, unsigned long delay);
68 extern void flush_scheduled_work(void);
69 extern int current_is_keventd(void);
70 extern int keventd_up(void);
71
72 extern void init_workqueues(void);
73 void cancel_rearming_delayed_work(struct work_struct *work);
74
75 /*
76  * Kill off a pending schedule_delayed_work().  Note that the work callback
77  * function may still be running on return from cancel_delayed_work().  Run
78  * flush_scheduled_work() to wait on it.
79  */
80 static inline int cancel_delayed_work(struct work_struct *work)
81 {
82         int ret;
83
84         ret = del_timer_sync(&work->timer);
85         if (ret)
86                 clear_bit(0, &work->pending);
87         return ret;
88 }
89
90 #endif