Root/kernel/workqueue_internal.h

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
13struct 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 */
22struct 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 */
58static 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/core.c and workqueue.c.
68 */
69void wq_worker_waking_up(struct task_struct *task, int cpu);
70struct task_struct *wq_worker_sleeping(struct task_struct *task, int cpu);
71
72#endif /* _KERNEL_WORKQUEUE_INTERNAL_H */
73

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