1fa44ecad2
We have several points in the SCSI stack (primarily for our device functions) where we need to guarantee process context, but (given the place where the last reference was released) we cannot guarantee this. This API gets around the issue by executing the function directly if the caller has process context, but scheduling a workqueue to execute in process context if the caller doesn't have it. Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
100 lines
2.7 KiB
C
100 lines
2.7 KiB
C
/*
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* workqueue.h --- work queue handling for Linux.
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*/
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#ifndef _LINUX_WORKQUEUE_H
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#define _LINUX_WORKQUEUE_H
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#include <linux/timer.h>
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#include <linux/linkage.h>
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#include <linux/bitops.h>
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struct workqueue_struct;
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struct work_struct {
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unsigned long pending;
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struct list_head entry;
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void (*func)(void *);
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void *data;
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void *wq_data;
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struct timer_list timer;
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};
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struct execute_work {
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struct work_struct work;
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};
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#define __WORK_INITIALIZER(n, f, d) { \
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.entry = { &(n).entry, &(n).entry }, \
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.func = (f), \
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.data = (d), \
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.timer = TIMER_INITIALIZER(NULL, 0, 0), \
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}
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#define DECLARE_WORK(n, f, d) \
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struct work_struct n = __WORK_INITIALIZER(n, f, d)
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/*
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* initialize a work-struct's func and data pointers:
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*/
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#define PREPARE_WORK(_work, _func, _data) \
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do { \
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(_work)->func = _func; \
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(_work)->data = _data; \
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} while (0)
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/*
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* initialize all of a work-struct:
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*/
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#define INIT_WORK(_work, _func, _data) \
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do { \
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INIT_LIST_HEAD(&(_work)->entry); \
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(_work)->pending = 0; \
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PREPARE_WORK((_work), (_func), (_data)); \
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init_timer(&(_work)->timer); \
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} while (0)
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extern struct workqueue_struct *__create_workqueue(const char *name,
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int singlethread);
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#define create_workqueue(name) __create_workqueue((name), 0)
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#define create_singlethread_workqueue(name) __create_workqueue((name), 1)
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extern void destroy_workqueue(struct workqueue_struct *wq);
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extern int FASTCALL(queue_work(struct workqueue_struct *wq, struct work_struct *work));
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extern int FASTCALL(queue_delayed_work(struct workqueue_struct *wq, struct work_struct *work, unsigned long delay));
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extern void FASTCALL(flush_workqueue(struct workqueue_struct *wq));
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extern int FASTCALL(schedule_work(struct work_struct *work));
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extern int FASTCALL(schedule_delayed_work(struct work_struct *work, unsigned long delay));
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extern int schedule_delayed_work_on(int cpu, struct work_struct *work, unsigned long delay);
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extern int schedule_on_each_cpu(void (*func)(void *info), void *info);
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extern void flush_scheduled_work(void);
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extern int current_is_keventd(void);
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extern int keventd_up(void);
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extern void init_workqueues(void);
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void cancel_rearming_delayed_work(struct work_struct *work);
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void cancel_rearming_delayed_workqueue(struct workqueue_struct *,
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struct work_struct *);
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int execute_in_process_context(void (*fn)(void *), void *,
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struct execute_work *);
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/*
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* Kill off a pending schedule_delayed_work(). Note that the work callback
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* function may still be running on return from cancel_delayed_work(). Run
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* flush_scheduled_work() to wait on it.
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*/
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static inline int cancel_delayed_work(struct work_struct *work)
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{
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int ret;
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ret = del_timer_sync(&work->timer);
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if (ret)
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clear_bit(0, &work->pending);
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return ret;
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}
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#endif
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