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
  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         struct list_head        scheduled;      /* L: scheduled works */
  33         struct task_struct      *task;          /* I: worker task */
  34         struct worker_pool      *pool;          /* I: the associated pool */
  35         /* 64 bytes boundary on 64bit, 32 on 32bit */
  36         unsigned long           last_active;    /* L: last active timestamp */
  37         unsigned int            flags;          /* X: flags */
  38         int                     id;             /* I: worker id */
  39
  40         /* for rebinding worker to CPU */
  41         struct work_struct      rebind_work;    /* L: for busy worker */
  42
  43         /* used only by rescuers to point to the target workqueue */
  44         struct workqueue_struct *rescue_wq;     /* I: the workqueue to rescue */
  45 };
  46
  47 /**
  48  * current_wq_worker - return struct worker if %current is a workqueue worker
  49  */
  50 static inline struct worker *current_wq_worker(void)
  51 {
  52         if (current->flags & PF_WQ_WORKER)
  53                 return kthread_data(current);
  54         return NULL;
  55 }
  56
  57 /*
  58  * Scheduler hooks for concurrency managed workqueue.  Only to be used from
  59  * sched.c and workqueue.c.
  60  */
  61 void wq_worker_waking_up(struct task_struct *task, unsigned int cpu);
  62 struct task_struct *wq_worker_sleeping(struct task_struct *task,
  63                                        unsigned int cpu);
  64
  65 #endif /* _KERNEL_WORKQUEUE_INTERNAL_H */