workqueue_internal.h 2.24 KB
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/*
 * 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

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#include <linux/workqueue.h>
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#include <linux/kthread.h>
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#include <linux/preempt.h>
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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 */
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	struct pool_workqueue	*current_pwq; /* L: current_work's pwq */
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	bool			desc_valid;	/* ->desc is valid */
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	struct list_head	scheduled;	/* L: scheduled works */
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	/* 64 bytes boundary on 64bit, 32 on 32bit */

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	struct task_struct	*task;		/* I: worker task */
	struct worker_pool	*pool;		/* I: the associated pool */
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						/* L: for rescuers */
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	struct list_head	node;		/* A: anchored at pool->workers */
						/* A: runs through worker->node */
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	unsigned long		last_active;	/* L: last active timestamp */
	unsigned int		flags;		/* X: flags */
	int			id;		/* I: worker id */

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

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

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

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/*
 * Scheduler hooks for concurrency managed workqueue.  Only to be used from
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 * sched/core.c and workqueue.c.
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 */
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void wq_worker_waking_up(struct task_struct *task, int cpu);
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struct task_struct *wq_worker_sleeping(struct task_struct *task);
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#endif /* _KERNEL_WORKQUEUE_INTERNAL_H */