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/*

 * workqueue.h --- work queue handling for Linux.

 */

#ifndef _LINUX_WORKQUEUE_H

#define _LINUX_WORKQUEUE_H

#include <linux/timer.h>

#include <linux/linkage.h>

#include <linux/bitops.h>

#include <linux/lockdep.h>

#include <asm/atomic.h>

struct workqueue_struct;

struct work_struct;

typedef void (*work_func_t)(struct work_struct *work);

/*

 * The first word is the work queue pointer and the flags rolled into

 * one

 */

#define work_data_bits(work) ((unsigned long *)(&(work)->data))

struct work_struct {

        atomic_long_t data;

#define WORK_STRUCT_PENDING 0           /* T if work item pending execution */

#define WORK_STRUCT_FLAG_MASK (3UL)

#define WORK_STRUCT_WQ_DATA_MASK (~WORK_STRUCT_FLAG_MASK)

        struct list_head entry;

        work_func_t func;

#ifdef CONFIG_LOCKDEP

        struct lockdep_map lockdep_map;

#endif

};

#define WORK_DATA_INIT()        ATOMIC_LONG_INIT(0)

struct delayed_work {

        struct work_struct work;

        struct timer_list timer;

};

struct execute_work {

        struct work_struct work;

};

#ifdef CONFIG_LOCKDEP

/*

 * NB: because we have to copy the lockdep_map, setting _key

 * here is required, otherwise it could get initialised to the

 * copy of the lockdep_map!

 */

#define __WORK_INIT_LOCKDEP_MAP(n, k) \

        .lockdep_map = STATIC_LOCKDEP_MAP_INIT(n, k),

#else

#define __WORK_INIT_LOCKDEP_MAP(n, k)

#endif

#define __WORK_INITIALIZER(n, f) {                              \

        .data = WORK_DATA_INIT(),                               \

        .entry  = { &(n).entry, &(n).entry },                   \

        .func = (f),                                            \

        __WORK_INIT_LOCKDEP_MAP(#n, &(n))                       \

        }

#define __DELAYED_WORK_INITIALIZER(n, f) {                      \

        .work = __WORK_INITIALIZER((n).work, (f)),              \

        .timer = TIMER_INITIALIZER(NULL, 0, 0),                   \

        }

#define DECLARE_WORK(n, f)                                      \

        struct work_struct n = __WORK_INITIALIZER(n, f)

#define DECLARE_DELAYED_WORK(n, f)                              \

        struct delayed_work n = __DELAYED_WORK_INITIALIZER(n, f)

/*

 * initialize a work item's function pointer

 */

#define PREPARE_WORK(_work, _func)                              \

        do {                                                    \

                (_work)->func = (_func);                        \

        } while (0)

#define PREPARE_DELAYED_WORK(_work, _func)                      \

        PREPARE_WORK(&(_work)->work, (_func))

/*

 * initialize all of a work item in one go

 *

 * NOTE! No point in using "atomic_long_set()": useing a direct

 * assignment of the work data initializer allows the compiler

 * to generate better code.

 */

#ifdef CONFIG_LOCKDEP

#define INIT_WORK(_work, _func)                                         \

        do {                                                            \

                static struct lock_class_key __key;                     \

                                                                        \

                (_work)->data = (atomic_long_t) WORK_DATA_INIT();       \

                lockdep_init_map(&(_work)->lockdep_map, #_work, &__key, 0);\

                INIT_LIST_HEAD(&(_work)->entry);                        \

                PREPARE_WORK((_work), (_func));                         \

        } while (0)

#else

#define INIT_WORK(_work, _func)                                         \

        do {                                                            \

                (_work)->data = (atomic_long_t) WORK_DATA_INIT();       \

                INIT_LIST_HEAD(&(_work)->entry);                        \

                PREPARE_WORK((_work), (_func));                         \

        } while (0)

#endif

#define INIT_DELAYED_WORK(_work, _func)                         \

        do {                                                    \

                INIT_WORK(&(_work)->work, (_func));             \

                init_timer(&(_work)->timer);                    \

        } while (0)

#define INIT_DELAYED_WORK_DEFERRABLE(_work, _func)                      \

        do {                                                    \

                INIT_WORK(&(_work)->work, (_func));             \

                init_timer_deferrable(&(_work)->timer);         \

        } while (0)

/**

 * work_pending - Find out whether a work item is currently pending

 * @work: The work item in question

 */

#define work_pending(work) \

        test_bit(WORK_STRUCT_PENDING, work_data_bits(work))

/**

 * delayed_work_pending - Find out whether a delayable work item is currently

 * pending

 * @work: The work item in question

 */

#define delayed_work_pending(w) \

        work_pending(&(w)->work)

/**

 * work_clear_pending - for internal use only, mark a work item as not pending

 * @work: The work item in question

 */

#define work_clear_pending(work) \

        clear_bit(WORK_STRUCT_PENDING, work_data_bits(work))

extern struct workqueue_struct *

__create_workqueue_key(const char *name, int singlethread,

                       int freezeable, struct lock_class_key *key,

                       const char *lock_name);

#ifdef CONFIG_LOCKDEP

#define __create_workqueue(name, singlethread, freezeable)      \

({                                                              \

        static struct lock_class_key __key;                     \

        const char *__lock_name;                                \

                                                                \

        if (__builtin_constant_p(name))                         \

                __lock_name = (name);                           \

        else                                                    \

                __lock_name = #name;                            \

                                                                \

        __create_workqueue_key((name), (singlethread),          \

                               (freezeable), &__key,            \

                               __lock_name);                    \

})

#else

#define __create_workqueue(name, singlethread, freezeable)      \

        __create_workqueue_key((name), (singlethread), (freezeable), NULL, NULL)

#endif

#define create_workqueue(name) __create_workqueue((name), 0, 0)

#define create_freezeable_workqueue(name) __create_workqueue((name), 1, 1)

#define create_singlethread_workqueue(name) __create_workqueue((name), 1, 0)

extern void destroy_workqueue(struct workqueue_struct *wq);

extern int FASTCALL(queue_work(struct workqueue_struct *wq, struct work_struct *work));

extern int FASTCALL(queue_delayed_work(struct workqueue_struct *wq,

                        struct delayed_work *work, unsigned long delay));

extern int queue_delayed_work_on(int cpu, struct workqueue_struct *wq,

                        struct delayed_work *work, unsigned long delay);

extern void FASTCALL(flush_workqueue(struct workqueue_struct *wq));

extern void flush_scheduled_work(void);

extern int FASTCALL(schedule_work(struct work_struct *work));

extern int FASTCALL(schedule_delayed_work(struct delayed_work *work,

                                        unsigned long delay));

extern int schedule_delayed_work_on(int cpu, struct delayed_work *work,

                                        unsigned long delay);

extern int schedule_on_each_cpu(work_func_t func);

extern int current_is_keventd(void);

extern int keventd_up(void);

extern void init_workqueues(void);

int execute_in_process_context(work_func_t fn, struct execute_work *);

extern int cancel_work_sync(struct work_struct *work);

/*

 * Kill off a pending schedule_delayed_work().  Note that the work callback

 * function may still be running on return from cancel_delayed_work(), unless

 * it returns 1 and the work doesn't re-arm itself. Run flush_workqueue() or

 * cancel_work_sync() to wait on it.

 */

static inline int cancel_delayed_work(struct delayed_work *work)

{

        int ret;

        ret = del_timer_sync(&work->timer);

        if (ret)

                work_clear_pending(&work->work);

        return ret;

}

extern int cancel_delayed_work_sync(struct delayed_work *work);

/* Obsolete. use cancel_delayed_work_sync() */

static inline

void cancel_rearming_delayed_workqueue(struct workqueue_struct *wq,

                                        struct delayed_work *work)

{

        cancel_delayed_work_sync(work);

}

/* Obsolete. use cancel_delayed_work_sync() */

static inline

void cancel_rearming_delayed_work(struct delayed_work *work)

{

        cancel_delayed_work_sync(work);

}

#endif