/*
   * kernel/workqueue_internal.h
   *
   * Workqueue internal header file.  Only to be included by workqueue and
   * core kernel subsystems.
   */
  #ifndef _KERNEL_WORKQUEUE_INTERNAL_H
  #define _KERNEL_WORKQUEUE_INTERNAL_H

  #include <linux/workqueue.h>

  #include <linux/kthread.h>

  struct worker_pool;
  
  /*
   * The poor guys doing the actual heavy lifting.  All on-duty workers are
   * either serving the manager role, on idle list or on busy hash.  For
   * details on the locking annotation (L, I, X...), refer to workqueue.c.
   *
   * Only to be used in workqueue and async.
   */
  struct worker {
  	/* on idle list while idle, on busy hash table while busy */
  	union {
  		struct list_head	entry;	/* L: while idle */
  		struct hlist_node	hentry;	/* L: while busy */
  	};
  
  	struct work_struct	*current_work;	/* L: work being processed */
  	work_func_t		current_func;	/* L: current_work's fn */

  	struct pool_workqueue	*current_pwq; /* L: current_work's pwq */

  	bool			desc_valid;	/* ->desc is valid */

  	struct list_head	scheduled;	/* L: scheduled works */

  
  	/* 64 bytes boundary on 64bit, 32 on 32bit */

  	struct task_struct	*task;		/* I: worker task */
  	struct worker_pool	*pool;		/* I: the associated pool */

  						/* L: for rescuers */

  	struct list_head	node;		/* A: anchored at pool->workers */
  						/* A: runs through worker->node */

  	unsigned long		last_active;	/* L: last active timestamp */
  	unsigned int		flags;		/* X: flags */
  	int			id;		/* I: worker id */

  	/*
  	 * Opaque string set with work_set_desc().  Printed out with task
  	 * dump for debugging - WARN, BUG, panic or sysrq.
  	 */
  	char			desc[WORKER_DESC_LEN];

  	/* used only by rescuers to point to the target workqueue */
  	struct workqueue_struct	*rescue_wq;	/* I: the workqueue to rescue */
  };

  /**
   * current_wq_worker - return struct worker if %current is a workqueue worker
   */
  static inline struct worker *current_wq_worker(void)
  {
  	if (current->flags & PF_WQ_WORKER)
  		return kthread_data(current);
  	return NULL;
  }

  /*
   * Scheduler hooks for concurrency managed workqueue.  Only to be used from

   * sched/core.c and workqueue.c.

   */

  void wq_worker_waking_up(struct task_struct *task, int cpu);

  struct task_struct *wq_worker_sleeping(struct task_struct *task);

  
  #endif /* _KERNEL_WORKQUEUE_INTERNAL_H */