1 /*
2 * kernel/workqueue_internal.h
3 *
4 * Workqueue internal header file. Only to be included by workqueue and
5 * core kernel subsystems.
6 */
7 #ifndef _KERNEL_WORKQUEUE_INTERNAL_H
8 #define _KERNEL_WORKQUEUE_INTERNAL_H
9
10 #include <linux/workqueue.h>
11 #include <linux/kthread.h>
12
13 struct worker_pool;
14
15 /*
16 * The poor guys doing the actual heavy lifting. All on-duty workers are
17 * either serving the manager role, on idle list or on busy hash. For
18 * details on the locking annotation (L, I, X...), refer to workqueue.c.
19 *
20 * Only to be used in workqueue and async.
21 */
22 struct worker {
23 /* on idle list while idle, on busy hash table while busy */
24 union {
25 struct list_head entry; /* L: while idle */
26 struct hlist_node hentry; /* L: while busy */
27 };
28
29 struct work_struct *current_work; /* L: work being processed */
30 work_func_t current_func; /* L: current_work's fn */
31 struct pool_workqueue *current_pwq; /* L: current_work's pwq */
32 bool desc_valid; /* ->desc is valid */
33 struct list_head scheduled; /* L: scheduled works */
34
35 /* 64 bytes boundary on 64bit, 32 on 32bit */
36
37 struct task_struct *task; /* I: worker task */
38 struct worker_pool *pool; /* I: the associated pool */
39 /* L: for rescuers */
40
41 unsigned long last_active; /* L: last active timestamp */
42 unsigned int flags; /* X: flags */
43 int id; /* I: worker id */
44
45 /*
46 * Opaque string set with work_set_desc(). Printed out with task
47 * dump for debugging - WARN, BUG, panic or sysrq.
48 */
49 char desc[WORKER_DESC_LEN];
50
51 /* used only by rescuers to point to the target workqueue */
52 struct workqueue_struct *rescue_wq; /* I: the workqueue to rescue */
53 };
54
55 /**
56 * current_wq_worker - return struct worker if %current is a workqueue worker
57 */
current_wq_worker(void)58 static inline struct worker *current_wq_worker(void)
59 {
60 if (current->flags & PF_WQ_WORKER)
61 return kthread_data(current);
62 return NULL;
63 }
64
65 /*
66 * Scheduler hooks for concurrency managed workqueue. Only to be used from
67 * sched.c and workqueue.c.
68 */
69 void wq_worker_waking_up(struct task_struct *task, int cpu);
70 struct task_struct *wq_worker_sleeping(struct task_struct *task, int cpu);
71
72 #endif /* _KERNEL_WORKQUEUE_INTERNAL_H */
73